Page 1 WORKSHOP MANUAL G23-2,G26-2 KiSC issued 02, 2014 A...
Page 2 TO THE READER This Workshop Manual tells the servicing personnel about the mechanism, servicing and maintenance of the G23-2 and G26-2. It contains 4 parts: "Information", "General", "Mechanism" and "Servicing".  Information This section contains information below. • Safety First •...
Page 3 Record of Revisions For pdf, use search function {Search word} to find all the revised locations. Last digit Issue Reference of the Main Revised Point and Corrective Measures {Search word} month Page Code No. 2014.02 Correcting the errors. G-41, 2-S33 Correcting of part names.
Page 4 INFORMATION KiSC issued 02, 2014 A...
Page 5 INFORMATION CONTENTS 1. SAFETY FIRST ..........................I-1 2. SAFETY DECALS .......................... I-4 3. SPECIFICATIONS.......................... I-9 4. DIMENSIONS ..........................I-10 KiSC issued 02, 2014 A...
Page 6: Safety First
G23-2, G26-2, WSM INFORMATION 1. SAFETY FIRST SAFETY FIRST • This symbol, the industry's "Safety Alert Symbol", is used throughout this manual and on labels on the machine itself to warn of the possibility of personal injury. Read these instructions carefully.
Page 7 G23-2, G26-2, WSM INFORMATION OPERATE SAFELY • Do not use the machine after you consume alcohol or medication or when you are tired. • Put on applicable clothing and safety equipment. • Use applicable tools only. Do not use alternative tools or parts.
Page 8 G23-2, G26-2, WSM INFORMATION KEEP A GOOD AIRFLOW IN THE WORK AREA • If the engine is in operation, make sure that the area has good airflow. Do not operate the engine in a closed area. The exhaust gas contains poisonous carbon monoxide.
Page 9: Safety Decals
G23-2, G26-2, WSM INFORMATION 2. SAFETY DECALS The following safety decals (pictorial safety labels) are installed on the machine. If a decal becomes damaged, illegible or is not on the machine, replace it. The decal part number is listed in the parts list.
Page 10 G23-2, G26-2, WSM INFORMATION 9Y1210892INI0002US0 KiSC issued 02, 2014 A...
Page 11 G23-2, G26-2, WSM INFORMATION 9Y1210892INI0003US0 KiSC issued 02, 2014 A...
Page 12 G23-2, G26-2, WSM INFORMATION 9Y1210892INI0004US0 KiSC issued 02, 2014 A...
Page 13 G23-2, G26-2, WSM INFORMATION 9Y1210892INI0005US0 CARE OF PICTORIAL SAFETY LABELS 1. Keep pictorial safety labels clean and free from obstructing material. 2. Clean pictorial safety labels with soap and water, dry with a soft cloth. 3. Replace damaged or missing pictorial safety labels with new labels.
Page 14: Specifications
G23-2, G26-2, WSM INFORMATION 3. SPECIFICATIONS G23-2 G26-2 Model Model D902-E3-GT D1005-E3-GT Type Liquid-cooled diesel Total displacement 898 cm (54.8 cu.in.) 1001 cm (61.1 cu.in.) Gross power 17.1 kW (23.3 HP) 18.8 kW (25.5 HP) Number of cylinders Engine Starter...
Page 15: Dimensions
G23-2, G26-2, WSM INFORMATION 4. DIMENSIONS 9Y1210892INI0008US0 I-10 KiSC issued 02, 2014 A...
Page 16 G23-2, G26-2, WSM INFORMATION 9Y1210892INI0009US0 I-11 KiSC issued 02, 2014 A...
Page 17 GENERAL KiSC issued 02, 2014 A...
Page 18: Table Of Contents
GENERAL CONTENTS 1. MACHINE IDENTIFICATION......................G-1 [1] SERIAL NUMBER ........................G-1 [2] CYLINDER NUMBER ......................G-2 2. GENERAL PRECAUTIONS......................G-3 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING ........G-4 [1] WIRING ..........................G-4 [2] BATTERY ..........................G-6 [3] FUSE ............................G-6 [4] CONNECTOR ........................
Page 19: Machine Identification
G23-2, G26-2, WSM GENERAL 1. MACHINE IDENTIFICATION [1] SERIAL NUMBER When contacting your local KUBOTA distributor, always specify engine serial number, tractor serial number and hour meter reading. (1) Machine Serial Number (4) Grass Catcher Serial Number (LD) (2) Engine Serial Number...
Page 20: Cylinder Number
G23-2, G26-2, WSM GENERAL [2] CYLINDER NUMBER You can see the cylinder numbers of KUBOTA diesel engine in the figure. The sequence of cylinder numbers is No. 1, No. 2 and No. 3 and it starts from the gear case side.
Page 21: General Precautions
• When it is necessary to use special tools, use KUBOTA special tools. Refer to the drawings when you make special tools that you do not use frequently.
Page 22: Handling Precautions For Electrical Parts And Wiring
G23-2, G26-2, WSM GENERAL 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING To ensure safety and prevent damage to the machine and surrounding equipment, obey the following precautions in handling electrical parts and wiring. IMPORTANT • Check electrical wiring for damage and loosened connection every year.
Page 23 G23-2, G26-2, WSM GENERAL • Securely clamp, being careful not to damage wiring. (1) Clamp (3) Clamp (Wind Clamp Spirally) (4) Welding Dent (2) Wire Harness WSM000001GEG0067US0 • Clamp wiring so that there is no twist, unnecessary sag, or excessive tension, except for movable part, where sag be required.
Page 24: Battery
G23-2, G26-2, WSM GENERAL [2] BATTERY • Be careful not to confuse positive and negative terminal posts. • When you remove battery cables, disconnect negative cable first. When you install battery cables, check for polarity and connect positive cable first.
Page 25: Handling Of Circuit Tester
G23-2, G26-2, WSM GENERAL • Use sandpaper to remove rust from terminals. • Repair deformed terminal. Make sure that there is no terminal being exposed or displaced. (1) Exposed Terminal (3) Sandpaper (2) Deformed Terminal (4) Rust WSM000001GEG0075US0 • Make sure that there is no female connector being too open.
Page 26: Color Of Wiring
G23-2, G26-2, WSM GENERAL [6] COLOR OF WIRING • Colors of wire are specified to the color codes. • This symbol of "/" shows color with stripe(s). (An example) Red stripe on white color: W/R Color of wiring Color code...
Page 27: Lubricants, Fuel And Coolant
SAE20, SAE10W-30 or 15W-40 • Below 0 °C (32 °F) SAE10W, SAE10W-30 or 15W-40 11 L Transmission case 12 U.S.qts KUBOTA UDT or SUPER UDT fluid* 9.7 Imp.qts 1.9 L 2.1 L Mower gear box 2.0 U.S.qts 2.2 U.S.qts KUBOTA UDT or SUPER UDT fluid* 1.7 Imp.qts...
Page 28 • * Oil amount when the oil level is at the upper level of the oil lever gauge. • Check the oil lever of the transmission case with the mower lifted up and grass catcher lowered. IMPORTANT • To prevent serious damage to hydraulic system, use only KUBOTA genuine fluid or its equivalent. 9Y1210892GEG0002US0 G-10...
Page 29 • The oil used to lubricate the transmission is also used as hydraulic fluid. To insure proper operation of the hydraulic system and to complete lubrication of the transmission, it is important that a multi-grade transmission fluid is used in this system. We recommend the use of KUBOTA UDT or SUPER UDT fluid for optimum protection and performance.
Page 30: Tightening Torques
G23-2, G26-2, WSM GENERAL 5. TIGHTENING TORQUES [1] GENERAL USE SCREWS, BOLTS AND NUTS Tighten screws, bolts and nuts whose tightening torques are not specified in this Workshop Manual according to the table below. Indication on top of bolt No-grade or 4T...
Page 31: American Standard Screws, Bolts And Nuts With Unc Or Unf Threads
G23-2, G26-2, WSM GENERAL [3] AMERICAN STANDARD SCREWS, BOLTS AND NUTS WITH UNC OR UNF THREADS Grade SAE GR.5 SAE GR.8 Unit N·m kgf·m lbf·ft N·m kgf·m lbf·ft 11.7 to 15.7 1.20 to 1.60 8.63 to 11.5 16.3 to 19.7 1.67 to 2.00...
Page 32: Maintenance Check List
G23-2, G26-2, WSM GENERAL 6. MAINTENANCE CHECK LIST Indication on hour meter Refer- After Impor- Item ence since tant 50 100 150 200 250 300 350 400 450 500 550 600 page every 1 Engine oil Change G-40  ...
Page 33 G23-2, G26-2, WSM GENERAL Indication on hour meter Refer- After Impor- Item ence since tant 50 100 150 200 250 300 350 400 450 500 550 600 page every 24 Toe-in Adjust G-45    200 Hr Fuel injection nozzle...
Page 34: Check And Maintenance
G23-2, G26-2, WSM GENERAL 7. CHECK AND MAINTENANCE CAUTION • Be sure to check and service the machine on a level surface with the engine shut off and the parking brake "ON" and implement lowered to the ground. 9Y1210892GEG0005US0 [1] DAILY CHECK To prevent trouble from occurring, it is important to know the condition of the machine.
Page 35 G23-2, G26-2, WSM GENERAL Checking and Refueling CAUTION To avoid personal injury : • Do not smoke while refueling. • Be sure to stop the engine and remove the key before refueling. • Handle fuel carefully. If the engine is running, do not fill the fuel tank.
Page 36 G23-2, G26-2, WSM GENERAL Checking and Cleaning Panel and Radiator Screen CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before removing the screen. 1. Check the panel screens to be sure they are clean from debris.
Page 37: Mower
G23-2, G26-2, WSM GENERAL Checking Transmission Fluid Level 1. Park the machine on a flat surface, raise the mower and lower the grass catcher and shut off engine. 2. To check the oil level, draw out the dipstick (2), wipe it clean, replace it, and draw it out again.
Page 38: Others
G23-2, G26-2, WSM GENERAL (6) Others 1. Check the areas where previous trouble was experienced. 9Y1210892GEG0018US0 [2] CHECK POINTS OF INITIAL 50 HOURS Changing Engine Oil CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before changing the oil.
Page 39 Top off if necessary. 5. Properly dispose of used oil. IMPORTANT • To prevent serious damage to the hydraulic system, use only a KUBOTA genuine filter. (1) Transmission Oil Filter 9Y1210892GEG0021US0 G-21 KiSC issued 02, 2014 A...
Page 40: Check Points Of Every 50 Hours
G23-2, G26-2, WSM GENERAL Changing Gear Box Oil CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before changing the oil. • Remove the right and left hand shields from the mower deck.
Page 41 G23-2, G26-2, WSM GENERAL Checking OPC System The OPC (Operator Presence Control) system in your machine are designed to protect you while operating. Please check these OPC system periodically - daily is best - to test function of the OPC system before operation.
Page 42 G23-2, G26-2, WSM GENERAL Checking PTO Control System The PTO control system in your machine are designed to protect you while operating. Please check these PTO control system periodically - daily is best - to test function of the PTO control system before operation.
Page 43 G23-2, G26-2, WSM GENERAL Greasing 1 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) Front Axle (King Pin)
Page 44 G23-2, G26-2, WSM GENERAL Greasing 2 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) Brake Pedal Link (4) HST Pedal Boss...
Page 45 G23-2, G26-2, WSM GENERAL Greasing 3 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) PTO (Spline) (3) Cruise Control Link...
Page 46 G23-2, G26-2, WSM GENERAL Greasing 4 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) Differential Lock Pedal Link...
Page 47 G23-2, G26-2, WSM GENERAL Greasing 5 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) Seat Pivot (4) Mower Lift Cylinder...
Page 48 G23-2, G26-2, WSM GENERAL Greasing 6 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) Mower Lift Link Front...
Page 49 G23-2, G26-2, WSM GENERAL Greasing 7 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) Dumper Cylinder (LD) (4) Grass Container Pivot...
Page 50 G23-2, G26-2, WSM GENERAL Greasing 8 CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before greasing. 1. Apply a grease to the following positions as figures. (1) Dump Pivot (HD) (LH, RH)
Page 51 G23-2, G26-2, WSM GENERAL Cleaning Air Cleaner Element CAUTION To avoid personal injury : • Be sure to stop engine and remove the key before cleaning air cleaner element. 1. Remove the air cleaner cover and element. a) Undo the hook.
Page 52 G23-2, G26-2, WSM GENERAL Checking Battery Condition DANGER To avoid the possibility of battery explosion : For the refillable type battery, follow the instructions below. • Do not use or charge the refillable type battery if the fluid level is below the LOWER (lower limit level) mark.
Page 53 G23-2, G26-2, WSM GENERAL (Continued) (For non-accessible maintenance-free type batteries.) Maintenance-free, non-accessible batteries are designed to eliminate the need to add water. Yet the volume of electrolyte above plates may eventually become depleted due to abnormal conditions such as high heat or improper regulator setting. Use a voltmeter to check the state of charge.
Page 54 G23-2, G26-2, WSM GENERAL Adjusting Front PTO Belt Tension CAUTION To avoid personal injury : • Always stop the engine, set the parking brake, remove the key, and disengage the PTO lever before working on the front PTO.  Adjusting...
Page 55: Check Points Of Every 100 Hours
G23-2, G26-2, WSM GENERAL [4] CHECK POINTS OF EVERY 100 HOURS Checking Fan Belt Tension CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before checking belt tension.  Adjusting A deflection of between 7 to 9 mm (0.3 Proper fan belt tension to 0.4 in.) when the belt is pressed in...
Page 56 G23-2, G26-2, WSM GENERAL Checking Parking Brake CAUTION To avoid personal injury: • Park the machine on a firm and level surface. • Stop the engine, remove the key, lower the mower and grass catcher to the lowest position, and chock the wheels before checking.
Page 57: Check Point Of Every 150 Hours
G23-2, G26-2, WSM GENERAL Checking Fuel Lines and Fuel Filter Element CAUTION To avoid personal injury : • Stop the engine and remove the key before checking fuel lines and fuel filter. • Check the fuel lines periodically. The fuel lines are subject to wear and aging.
Page 58: Check Points Of Every 200 Hours
G23-2, G26-2, WSM GENERAL [6] CHECK POINTS OF EVERY 200 HOURS Changing Engine Oil CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before changing the oil. • Allow engine to cool down sufficiently; oil can be hot and may cause burns.
Page 59 G23-2, G26-2, WSM GENERAL Replacing Transmission Oil Filter CAUTION To avoid personal injury : • Allow engine to cool down sufficiently; oil can be hot and can burn. 1. Remove the oil filter. 2. Put a film of clean transmission oil on rubber seal of new filter.
Page 60 G23-2, G26-2, WSM GENERAL Checking Hydraulic Hose CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before checking power steeling line. 1. Check to see that all lines are tight and not damaged.
Page 61 G23-2, G26-2, WSM GENERAL (Continued) (7) Front PTO Return Hose (11) Grass Container Lift Cylinder Hose (8) Grass Container Dump Cylinder (LH) (HD) Hose (LD) (12) Grass Container Dump Cylinder (9) Grass Container Dump Cylinder Hose (HD) Hose (HD) (10) Grass Container Lift Cylinder Hose...
Page 62 G23-2, G26-2, WSM GENERAL Checking Radiator Hose and Clamp CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key before checking radiator hose and clamps. Check to see if radiator hoses are properly secured every 200 hours of operation or six months, whichever comes first.
Page 63: Check Points Of Every 400 Hours
2. After draining, reinstall the drain plugs. Clean the transmission strainer. Fill with new KUBOTA SUPER UDT fluid up to the upper notch on the dipstick. After running the engine for a few minutes, stop it and check the oil level again, add oil to prescribed level.
Page 64: Check Point Of Every 1500 Hours
G23-2, G26-2, WSM GENERAL Cleaning Transmission Strainer When changing the transmission fluid, disassemble and rinse the strainer with nonflammable solvent to completely clean off fillings. When reassembling, be careful not to damage the parts. NOTE • Since the fine filings in the oil can damage the precision component parts of the hydraulic system, the end of the suction line is provided with an oil strainer.
Page 65: Check Points Of Every 2 Years
G23-2, G26-2, WSM GENERAL [11] CHECK POINTS OF EVERY 2 YEARS Replacing Fuel Lines 1. Replace the hose and the clamps. Refer to "Checking Fuel Line and Fuel Filter". (See page G-39.) 9Y1210892GEG0057US0 Replacing Hydraulic Hose 1. Replace hoses and hose clamps every 2 years or earlier if checked and found that hoses are swollen, hardened or cracked.
Page 66 G23-2, G26-2, WSM GENERAL Replacing Mower Gear Box Seal 1. Replace the mower gear box oil seals (1), (2), (3). (1) Oil Seal (3) Oil Seal (2) Oil Seal 9Y1210892GEG0061US0 Replacing Intake Air Line • See page G-44. 9Y1210892GEG0062US0 G-48...
Page 67 G23-2, G26-2, WSM GENERAL Flushing Cooling System and Changing Coolant CAUTION To avoid personal injury : • Do not remove the radiator cap while coolant is hot. When cool, slowly rotate cap to the first stop and allow sufficient time for excess pressure to escape before removing cap completely.
Page 68 G23-2, G26-2, WSM GENERAL (Continued)  Anti-Freeze CAUTION To avoid personal injury : • When using anti-freeze, put on some protection such as rubber gloves (Anti-freeze contains poison.). • If anti-freeze is ingested, induce vomiting at once and seek medical attention.
Page 69: Others
The LLC contains anti-corrosive agent. If mixed with the cleaning agent, sludge may build up, adversely affecting the engine parts. 7. KUBOTA's genuine long-life coolant has a service life of 2 years. Be sure to change the coolant every 2 years. NOTE •...
Page 70 • When replacing to new shear pins, be sure to replace with the new cup washer as well. • To prevent serious damage or premature failure to mower gear case and PTO system, use only genuine KUBOTA shear pins and cup washers. NOTE •...
Page 71 G23-2, G26-2, WSM GENERAL Checking and Replacing Blade WARNING To avoid personal injury : • Be sure to stop the engine and remove the key. • Blades may be sharp. When you handle blades, wear heavy gloves or wrap end of blade with a rag.
Page 72 G23-2, G26-2, WSM GENERAL (Continued) NOTE • Use the proper size box or socket wrench to tighten or loosen the blade mounting bolt. 6. To sharpen the blades yourself, clamp the blade securely in a vise. Use a large mill file and file along the original bevel until sharp.
Page 73: Special Tools
G23-2, G26-2, WSM GENERAL 8. SPECIAL TOOLS [1] SPECIAL TOOLS FOR ENGINE Special Use Puller Set Code No. • 07916-09032 Application • Use exclusively to pull out bearing, gears and other parts with ease. WSM000001GEG0011US0 Piston Ring Compressor Code No.
Page 74 G23-2, G26-2, WSM GENERAL Diesel Engine Compression Tester (for Glow Plug) Code No. • 07909-39081 (Assembly) • 07909-31291 (K) • 07909-31301 (L) • 07909-31311 (M) Application • Use to measure diesel engine compression and diagnosis of need for major overhaul.
Page 75 G23-2, G26-2, WSM GENERAL Connecting Rod Alignment Tool Code No. • 07909-31661 Application • Use to check the connecting rod alignment. Applicable range • Connecting rod big end I.D. 30 to 75 mm dia. (1.2 to 2.9 in. dia.) • Connecting rod length 65.0 to 300 mm (2.56 to 11.8 in.)
Page 76 G23-2, G26-2, WSM GENERAL Valve Guide Replacing Tool Application • Use to press out and press fit the valve guide. [G26-2] 20 mm dia. (0.79 in. dia.) 11.7 to 11.9 mm dia. (0.460 to 0.468 in. dia.) 6.5 to 6.6 mm dia. (0.256 to 0.259 in. dia.) 225 mm (8.86 in.)
Page 77 G23-2, G26-2, WSM GENERAL Bushing Replacing Tool Application • Use to press out and press fit the bushing. [For small end bushing] 145 mm (5.71 in.) 20 mm (0.79 in.) 100 mm (3.94 in.) 19.90 to 19.95 mm dia. (0.7835 to 0.7854 in. dia.) 21.90 to 21.95 mm dia.
Page 78: Special Tools For Machine
G23-2, G26-2, WSM GENERAL Crankshaft Bearing 1 Replacing Tool Application • Use to press out and press fit the crankshaft bearing 1. [Press Out] 135 mm (5.31 in.) 72 mm (2.83 in.) 40 mm radius (1.57 in. radius) 10 mm (0.39 in.) 22 mm (0.87 in.)
Page 79 G23-2, G26-2, WSM GENERAL Hydrostatic Transmission Tester and HST Adaptor Set Code No. • 07916-52040 (Hydrostatic Transmission Tester) • 07916-53072 (HST Adaptor Set) Application • This allows easy measurement of hydrostatic transmission pressure. (1) Hydrostatic transmission Tester (8) Valve Seat Driver (07916-60841)
Page 80: Tyre Pressure And Wheel
G23-2, G26-2, WSM GENERAL 9. TYRE PRESSURE AND WHEEL [1] TYRE PRESSURE Checking Tyre Pressure WARNING To avoid personal injury : • Do not attempt to mount a tyre on a rim. This should be done by a qualified person with the proper equipment.
Page 81: Implement Limitations
KUBOTA. Use of implements which exceed the maximum loading weight listed below, or which are not recommended for use with the KUBOTA Machine may result in malfunctions or failures of the machine, damage to other property and injury to the operator or others. (Any malfunctions or failures of the machine resulting from use with improper implements are not covered by the warranty.)
Page 82 G23-2, G26-2, WSM GENERAL Ballast CAUTION To avoid personal injury: • Additional ballast will be needed for operating heavy attachments. When the attachment is raised, drive slowly over rough ground, regardless of how much ballast is used. • Add front ballast to increase front end stability and help prevent possible front end tip up.
Page 83 ENGINE KiSC issued 02, 2014 A...
Page 84 MECHANISM CONTENTS 1. ENGINE BODY........................... 1-M1 [1] HALF-FLOATING HEAD COVER ..................1-M1 [2] CLOSED BREATHER ......................1-M1 [3] PISTON (G23) ........................1-M2 [4] OIL PAN (G23) ........................1-M2 2. COOLING SYSTEM ........................1-M3 [1] COOLING FIN (G23) ......................1-M3 [2] GOVERNOR (G26) ......................1-M3 [3] BOOST COMPENSATOR ....................
Page 85: Engine Body
G23-2, G26-2, WSM ENGINE 1. ENGINE BODY [1] HALF-FLOATING HEAD COVER The rubber packing is fitted in to keep the cylinder head cover 0.5 mm (0.02 in.) or so off the cylinder head. This arrangement helps reduce noise coming from the cylinder head.
Page 86: Piston (G23)
G23-2, G26-2, WSM ENGINE [3] PISTON (G23) Piston's skirt coated with molybdenum disulfide*, which reduces the piston slap noise and thus the entire operating noise. *Molybdenum disulfide (MoS The molybdenum disulfide (1) serves as a solid lubricant, like a Graphite or Teflon. This material helps resist metal wears even with little lube oil.
Page 87: Cooling System
G23-2, G26-2, WSM ENGINE 2. COOLING SYSTEM [1] COOLING FIN (G23) The cooling fin is set up around the oil passage in the gear case. Therefore, the temperature of oil is decreased by the wind generated by the cooling fan.
Page 88 G23-2, G26-2, WSM ENGINE (At Rated Operation) When the engine is running, the fork lever 2 (9) and the floating lever (7) are moving with the fork lever 1 (6) due to the tension of the governor spring (3). During the time, the torque pin (8) is pressed into the floating lever by centrifugal force of the governor weight (5).
Page 89: Boost Compensator
G23-2, G26-2, WSM ENGINE [3] BOOST COMPENSATOR (1) Boost Compensator Assembly (2) Actuator (3) Plate (4) Injection Pump Assembly (5) Guide (6) Stop Solenoid Fulcrum Boost compensator is the device that reduces black smoke during the engine startup and acceleration.
Page 90 SERVICING CONTENTS 1. TROUBLESHOOTING.........................1-S1 2. SERVICING SPECIFICATIONS ....................1-S4 [1] G23............................1-S4 [2] G26............................1-S9 3. TIGHTENING TORQUES......................1-S14 4. CHECKING, DISASSEMBLING AND SERVICING ..............1-S15 [1] CHECKING AND ADJUSTING....................1-S15 (1) Engine Body ........................1-S15 (2) Lubricating System ......................1-S17 (3) Cooling System ......................1-S17 (4) Fuel System........................1-S19 [2] DISASSEMBLING AND ASSEMBLING ................1-S22 (1) Separating Engine ......................1-S22 (2) Removing Engine Outer Parts..................1-S29...
Page 91: Troubleshooting
G23-2, G26-2, WSM ENGINE 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Engine Does Not No fuel Fill fuel G-17 Start Air in the fuel system Bleed G-51 Water in the fuel system Change fuel and – repair or replace fuel...
Page 92 G23-2, G26-2, WSM ENGINE Reference Symptom Probable Cause Solution Page Either Black or Dark Overload Reduce the load – Gray Exhaust Gas Is Low grade fuel used Use specified fuel Observed Fuel filter clogged Replace G-46 Air cleaner clogged Clean or replace...
Page 93 G23-2, G26-2, WSM ENGINE Reference Symptom Probable Cause Solution Page Engine Overheated Engine oil insufficient Fill G-16 Fan belt broken or elongated Replace or adjust 1-S17 Coolant insufficient Fill G-19 Radiator net and radiator fin clogged with dust Clean –...
Page 94: Servicing Specifications
G23-2, G26-2, WSM ENGINE 2. SERVICING SPECIFICATIONS [1] G23 ENGINE BODY Item Factory Specification Allowable Limit Compression Pressure 3.53 to 4.02 MPa 2.55 MPa 36.0 to 41.0 kgf/cm 26.0 kgf/cm 512 to 583 psi 370 psi • Differential among Cylinders –...
Page 95 G23-2, G26-2, WSM ENGINE Item Factory Specification Allowable Limit Tappet to Tappet Guide Bore Clearance 0.016 to 0.052 mm 0.10 mm 0.00063 to 0.0020 in. 0.0039 in. • Tappet O.D. 17.966 to 17.984 mm – 0.70733 to 0.70803 in. • Tappet Guide Bore I.D.
Page 96 G23-2, G26-2, WSM ENGINE Item Factory Specification Allowable Limit Piston Pin to Small End Bushing Clearance 0.015 to 0.075 mm 0.15 mm 0.0059 to 0.0029 in. 0.0059 in. • Piston Pin O.D. 20.002 to 20.011 mm – 0.78748 to 0.78783 in.
Page 97 G23-2, G26-2, WSM ENGINE Item Factory Specification Allowable Limit Crankshaft to Crankshaft Bearing 2 Oil Clearance 0.028 to 0.059 mm 0.20 mm 0.0011 to 0.0023 in. 0.0079 in. • Crankshaft Journal O.D. 43.934 to 43.950 mm – 1.7297 to 1.7303 in.
Page 98 G23-2, G26-2, WSM ENGINE COOLING SYSTEM Item Factory Specification Allowable Limit Fan Belt Tension 7.0 to 9.0 mm / 98 N – 0.28 to 0.35 in. / 98 N (10 kgf, 22lbf) Radiator Cap Pressure Falling 10 seconds or more –...
Page 99: G26
G23-2, G26-2, WSM ENGINE [2] G26 ENGINE BODY Item Factory Specification Allowable Limit Compression Pressure 3.73 to 4.11 MPa 2.26 MPa 38.0 to 42.0 kgf/cm 23.0 kgf/cm 541 to 596 psi 328 psi • Differential among Cylinders – 10 % or less Valve Clearance (Cold) 0.145 to 0.185 mm...
Page 100 G23-2, G26-2, WSM ENGINE Item Factory Specification Allowable Limit Tappet to Tappet Guide Clearance 0.020 to 0.062 mm 0.07 mm 0.00079 to 0.0024 in. 0.003 in. • Tappet O.D. 19.959 to 19.980 mm – 0.78579 to 0.78661 in. • Tappet Guide I.D.
Page 101 G23-2, G26-2, WSM ENGINE Item Factory Specification Allowable Limit Piston Pin to Small End Bushing Clearance 0.014 to 0.038 mm 0.15 mm 0.00056 to 0.0014 in. 0.0059 in. • Piston Pin O.D. 22.002 to 22.011 mm – 0.86622 to 0.86657 in.
Page 102 G23-2, G26-2, WSM ENGINE Item Factory Specification Allowable Limit Crankshaft to Crankshaft Bearing 2 Oil Clearance 0.034 to 0.095 mm 0.20 mm 0.0014 to 0.0037 in. 0.0079 in. • Crankshaft O.D. 47.934 to 47.950 mm – 1.8872 to 1.8877 in.
Page 103 G23-2, G26-2, WSM ENGINE COOLING SYSTEM Item Factory Specification Allowable Limit Fan Belt Tension 7.0 to 9.0 mm / 98 N – 0.28 to 0.35 in. / 98 N (10 kgf, 22lbf) Radiator Cap Pressure Falling 10 seconds or more –...
Page 104: Tightening Torques
G23-2, G26-2, WSM ENGINE 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-12.) [Tractor Section] Item N·m kgf·m...
Page 105: Checking, Disassembling And Servicing
G23-2, G26-2, WSM ENGINE 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Engine Body Compression Pressure 1. Run the engine until it is warmed up. 2. Stop the engine. 3. Remove the air cleaner, the muffler and all glow plugs (or nozzles).
Page 106 G23-2, G26-2, WSM ENGINE Checking Valve Clearance IMPORTANT • Valve clearance must be checked and adjusted when engine is cold. 1. Remove the cylinder head cover and the glow plugs. 2. Align the "1TC" mark (1) on the flywheel and alignment mark (2) on the rear end plate so that the No.
Page 107: Lubricating System
G23-2, G26-2, WSM ENGINE (2) Lubricating System Engine Oil Pressure 1. Remove the engine oil pressure switch, and set an oil pressure tester. 2. Start the engine. After warming up, measure the oil pressure of both idling and rated speeds.
Page 108 G23-2, G26-2, WSM ENGINE Fan Belt Damage and Wear 1. Check the fan belt for damage. 2. If the fan belt is damaged, replace it. 3. Check if the fan belt is worn and sunk in the pulley groove. 4. If the fan belt is nearly worn out and deeply sunk in the pulley groove, replace it.
Page 109: Fuel System
G23-2, G26-2, WSM ENGINE Thermostat Valve Opening Temperature 1. Suspend the thermostat in the water by a string with its end inserted between the valve and seat. 2. Heating the water gradually, read the temperature when the valve opens and leaves the string.
Page 110 5. Set the speed control lever to the maximum speed position. 6. Run the starter to increase the pressure. 7. If the pressure can not reach the allowable limit, replace the pump with new one or repair with a KUBOTA-authorized pump service shop. 13.73 MPa...
Page 111 G23-2, G26-2, WSM ENGINE CAUTION • Check the nozzle injection pressure and condition after you make sure that there is nobody standing in the direction the fume goes. If the fume from the nozzle directly contacts the human body, cells may be destroyed and blood poisoning may be caused.
Page 112: Disassembling And Assembling
G23-2, G26-2, WSM ENGINE Nozzle Holder 1. Secure the nozzle retaining nut (7) with a vise. 2. Remove the nozzle holder (1), and take out parts inside. (When reassembling) • Assemble the nozzle in clean fuel oil. • Install the push rod (4), noting its direction.
Page 113 G23-2, G26-2, WSM ENGINE Battery Cables and Battery CAUTION • When disconnecting the battery cables, disconnect the negative cable from the battery first. When connecting, connect the positive cable to the battery first. 1. Remove the under panel. 2. Disconnect the negative cable (2) from the battery (1).
Page 114 G23-2, G26-2, WSM ENGINE Fan Shroud 1. Remove the fan shroud (3). (When reassembling) • Return the accelerator wire and the wiring harness to the original position as shown in the picture. (1) Accelerator Wire (4) Bolt (2) Bolt (5) Wiring Harness...
Page 115 G23-2, G26-2, WSM ENGINE Fuel Hoses, Accelerator Wire, Bonnet Support and Wiring Connector 1. Disconnect the overflow fuel hose (1). 2. Disconnect the accelerator wire (2). 3. Disconnect the fuel hose (3). 4. Disconnect the wiring connector (8) from the coolant temperature sensor.
Page 116 G23-2, G26-2, WSM ENGINE PTO Clutch Drive Belts 1. Remove the belt cover (2). 2. Loosen the tension pulley spring nut (7). 3. Remove the belt tension pulley stay (6). 4. Remove the PTO clutch drive belts (1). 5. Remove the PTO clutch assembly mounting bolts (4).
Page 117 G23-2, G26-2, WSM ENGINE Disconnecting Wiring Harness 1. Disconnect the wiring connector (1) from the engine oil pressure sensor (8). 2. Disconnect the connector (2) from the starter motor ST terminal. 3. Disconnect the wiring harness (3) from the starter motor B terminal.
Page 118 G23-2, G26-2, WSM ENGINE Engine Mounting Nut and Coupling Mounting Bolt 1. Remove the engine mounting nuts (2), (5). 2. Disconnect the ground cable (1). 3. Remove the coupling mounting bolts (8). 4. Disconnect the coupling from the fan drive pulley (9).
Page 119: Removing Engine Outer Parts
G23-2, G26-2, WSM ENGINE (2) Removing Engine Outer Parts Draining Coolant and Removing Engine Outer Parts CAUTION • Never open the radiator cap while operating or immediately after stopping. Otherwise, hot water will spout out from the radiator. Wait for more than ten minutes to cool the radiator, before opening the cap.
Page 120 G23-2, G26-2, WSM ENGINE Injection Pipes 1. Loosen the screws to the pipe clamps (1). 2. Remove the injection pipes (2). (When reassembling) • Send compressed air into the pipes to blow out dust. Then, reassemble the pipes in the reverse order.
Page 121 G23-2, G26-2, WSM ENGINE Rocker Arm and Push Rod 1. Remove the rocker arm bracket nut. 2. Remove the rocker arm assembly (1). 3. Remove the push rods (2). (When reassembling) • When refitting the push rods (2) into the tappets (3), make sure the push rod locates correctly into the tappet seat.
Page 122 G23-2, G26-2, WSM ENGINE Tappets 1. Remove the tappets (1) from the crankcase. (When reassembling) • Visually check the contact between tappets and cams for proper rotation. If problem is found, replace tappets. • Before installing the tappets, apply engine oil thinly around them.
Page 123: Gear Case And Timing Gears
G23-2, G26-2, WSM ENGINE (4) Gear Case and Timing Gears Oil Pan and Oil Strainer 1. Remove the oil pan mounting screws. 2. Remove the oil pan (2). 3. Remove the oil strainer (1). (When reassembling) • After cleaning the oil strainer, check to see that the filter mesh in clean, and install it.
Page 124 G23-2, G26-2, WSM ENGINE Gear Case 1. Remove the fuel feed pump. 2. Remove the gear case. (When reassembling) • Grease thinly to the oil seal, and install it, ensuring the lip does not come off. (1) Gear Case Bolt Length = 45 mm (1.8 in.) Bolt Length = 50 mm (2.0 in.)
Page 125 G23-2, G26-2, WSM ENGINE Injection Pump 1. Disconnect the start spring (4) on the thrust lever side (5). 2. Align the control rack pin (2) with the notch (1) on the crankcase and remove the injection pump (3). 3. Remove the injection pump shims.
Page 126 G23-2, G26-2, WSM ENGINE Cam Gear, Idle Gear 1, 2 and Governor Gear 1. Remove the idle gear 1 (4). 2. Remove the fuel camshaft stopper (7). 3. Draw out the fuel cam gear (1) with fuel camshaft (8). 4. Remove the camshaft stopper bolt.
Page 127: Piston And Connecting Rod
G23-2, G26-2, WSM ENGINE (5) Piston and Connecting Rod Connecting Rod Cap 1. Remove the connecting rod cap. (When reassembling) • Align the marks (a) with each other. (Face the marks toward the injection pump.) • Apply engine oil to the connecting rod screws and lightly screw it in by hand, then tighten it to the specified torque.
Page 128 G23-2, G26-2, WSM ENGINE Piston Ring and Connecting Rod 1. Remove the piston rings using a piston ring tool. 2. Remove the piston pin (7), and separate the connecting rod (6) from the piston (5). (When reassembling) • When installing the rings so that the manufacturer's mark (12) near the gap faces the top of the piston.
Page 129: Flywheel And Crankshaft
G23-2, G26-2, WSM ENGINE (6) Flywheel and Crankshaft Flywheel 1. Secure the flywheel to keep it from turning using a flywheel stopper. 2. Remove all flywheel screws (1) and then remove the flywheel (2). (When reassembling) • Align the "1TC" mark (a) on the outer surface of the flywheel horizontally with the alignment mark (b) on the rear end plate.
Page 130 G23-2, G26-2, WSM ENGINE Crankshaft Assembly 1. Remove the main bearing case screw 2 (1). 2. Pull out all the crankshaft assembly. IMPORTANT • Be careful to protect crankcase bearing 1 from scratches, caused by the crank gear, etc.. (Wrap the gear in vinyl tape, etc.)
Page 131: Servicing
G23-2, G26-2, WSM ENGINE [3] SERVICING (1) Cylinder Head and Valves Top Clearance 1. Remove the cylinder head. (Do not try to remove the cylinder head gasket.) 2. Move the piston up and stick a strip of fuse [1.5 mm dia.
Page 132 G23-2, G26-2, WSM ENGINE Cylinder Head Surface Flatness 1. Clean the cylinder head surface. 2. Put a straightedge on the cylinder head's four sides and two diagonal as shown in the figure. 3. Measure the clearance with a thickness gauge.
Page 133 G23-2, G26-2, WSM ENGINE Valve Recessing 1. Clean the cylinder head surface, valve face and valve seat. 2. Insert the valve into the valve guide. 3. Measure the valve recessing with a depth gauge. 4. If the measurement exceeds the allowable limit, replace the valve.
Page 134: Specifications
G23-2, G26-2, WSM ENGINE Replacing Valve Guide (When removing) 1. Press out the used valve guide using a valve guide replacing tool. (See page G-58.) (When installing) 1. Clean a new valve guide and valve guide bore, and apply engine oil to them.
Page 135 G23-2, G26-2, WSM ENGINE Correcting Valve and Valve Seat NOTE • Before correcting the valve and seat, check the valve stem and the I.D. of valve guide section and repair them if necessary. • After correcting the valve seat, be sure to check the valve recessing.
Page 136 G23-2, G26-2, WSM ENGINE Free Length and Tilt of Valve Spring 1. Measure the free length (B) of valve spring with vernier calipers. If the measurement is less than the allowable limit, replace it. 2. Put the valve spring on a surface plate, place a square on the side of the valve spring.
Page 137 G23-2, G26-2, WSM ENGINE Oil Clearance between Rocker Arm and Rocker Arm Shaft 1. Measure the rocker arm shaft O.D. with an outside micrometer. 2. Measure the rocker arm I.D. with an inside micrometer, and then calculate the oil clearance.
Page 138 G23-2, G26-2, WSM ENGINE Oil Clearance between Tappet and Tappet Guide Bore 1. Measure the tappet O.D. with an outside micrometer. 2. Measure the I.D. of the tappet guide bore with a cylinder gauge, and calculate the oil clearance. 3. If the oil clearance exceeds the allowable limit or the tappet is damage, replace the tappet.
Page 139: Timing Gears, Camshaft And Governor Gear
G23-2, G26-2, WSM ENGINE (2) Timing Gears, Camshaft and Governor Gear Timing Gear Backlash 1. Set a dial indicator (lever type) with its tip on the gear tooth. 2. Move the gear to measure the backlash, holding its mating gear.
Page 140 G23-2, G26-2, WSM ENGINE Camshaft Side Clearance 1. Set a dial indicator with its tip on the camshaft. 2. Measure the side clearance by moving the cam gear to the font and rear. 3. If the measurement exceeds the allowable limit, replace the camshaft stopper.
Page 141 G23-2, G26-2, WSM ENGINE Oil Clearance of Camshaft Journal 1. Measure the camshaft journal O.D. with an outside micrometer. 2. Measure the cylinder block bore I.D. for camshaft with a cylinder gauge, and calculate the oil clearance. 3. If the oil clearance exceeds the allowable limit, replace the camshaft.
Page 142: Piston And Connecting Rod
G23-2, G26-2, WSM ENGINE Replacement of Idle Gear Bushing (When removing) 1. Press out the used idle gear bushing with the replacing tool. (See page G-59.) (When installing) 1. Clean a new idle gear bushing and idle gear bore, and apply engine oil to them.
Page 143 G23-2, G26-2, WSM ENGINE Oil Clearance between Piston Pin and Small End Bushing 1. Measure the piston pin O.D. where it contacts the bushing with an outside micrometer. 2. Measure the small end bushing I.D. with an inside micrometer, and calculate the oil clearance.
Page 144 G23-2, G26-2, WSM ENGINE Connecting Rod Alignment NOTE • Since the I.D. of the connecting rod small end bushing is the basis of this check, check bushing for wear beforehand. 1. Install the piston pin into the connecting rod. 2. Install the connecting rod on the connecting rod alignment tool.
Page 145 G23-2, G26-2, WSM ENGINE Clearance between Piston Ring and Piston Ring Groove 1. Clean the rings and the ring grooves, and install each ring in its groove. 2. Measure the clearance between the ring and the groove with a feeler gauge or depth gauge.
Page 146: Crankshaft
G23-2, G26-2, WSM ENGINE (4) Crankshaft Crankshaft Side Clearance 1. Set a dial indicator with its tip on the end of the crankshaft. 2. Measure the side clearance by moving the crankshaft to the front and rear. 3. If the measurement exceeds the allowable limit, replace the thrust bearings.
Page 147 G23-2, G26-2, WSM ENGINE Oil Clearance between Crankpin and Crankpin Bearing (G23) 1. Clean the crankpin and crankpin bearing. 2. Put a strip of plastigage on the center of the crankpin. 3. Install the connecting rod cap and tighten the connecting rod screws to the specified torque, and remove the cap again.
Page 148 G23-2, G26-2, WSM ENGINE Oil Clearance between Crankpin and Crankpin Bearing (G26) 1. Clean the crankpin and crankpin bearing. 2. Put a strip of plastigage on the center of the crankpin. 3. Install the connecting rod cap and tighten the connecting rod screws to the specified torque, and remove the cap again.
Page 149 G23-2, G26-2, WSM ENGINE Oil Clearance between Crankshaft Journal and Crankshaft Bearing 1 (G23) 1. Measure the O.D. of the crankshaft front journal with an outside micrometer. 2. Measure the I.D. of the crankshaft bearing 1 with an inside micrometer, and calculate the oil clearance.
Page 150 G23-2, G26-2, WSM ENGINE Oil Clearance between Crankshaft Journal and Crankshaft Bearing 1 (G26) 1. Measure the O.D. of the crankshaft front journal with an outside micrometer. 2. Measure the I.D. of the crankshaft bearing 1 with an inside micrometer, and calculate the oil clearance.
Page 151 G23-2, G26-2, WSM ENGINE Oil Clearance between Crankshaft Journal and Crankshaft Bearing 2 and Crankshaft Bearing 3 (G23) 1. Put a strip of plastigage on the center of the journal. 2. Install the bearing case and tighten the bearing case screws 1 to the specified torque, and remove the bearing case again.
Page 152 G23-2, G26-2, WSM ENGINE Oil Clearance between Crankshaft Journal and Crankshaft Bearing 2 and Crankshaft Bearing 3 (G26) 1. Put a strip of plastigage on the center of the journal. 2. Install the bearing case and tighten the bearing case screws 1 to the specified torque, and remove the bearing case again.
Page 153: Cylinder
G23-2, G26-2, WSM ENGINE (5) Cylinder Cylinder Wear 1. Measure the I.D. of the cylinder at the six positions (see figure) with a cylinder gauge to find the maximum and minimum I.D.'s. 2. Get the difference (Maximum wear) between the maximum and the minimum I.D.'s.
Page 154: Oil Pump (G23)
G23-2, G26-2, WSM ENGINE (6) Oil Pump (G23) Rotor Lobe Clearance 1. Measure the clearance between lobes of the inner rotor and the outer rotor with a thickness gauge. 2. If the clearance exceeds the factory specifications, replace the oil pump rotor assembly.
Page 155: Relief Valve Spring
G23-2, G26-2, WSM ENGINE Clearance between Rotor and Cover 1. Put a strip of plastigage onto the rotor face with grease. 2. Install the cover and tighten the screws. 3. Remove the cover carefully, and measure the amount of the flattening with the scale and get the clearance.
Page 156 TRANSAXLE KiSC issued 02, 2014 A...
Page 157 MECHANISM CONTENTS 1. STRUCTURE..........................2-M1 2. HST SECTION..........................2-M2 3. REAR AXLE..........................2-M3 4. BRAKE............................2-M4 5. PTO CLUTCH..........................2-M5 [1] MECHANICAL PTO CLUTCH ....................2-M5 (1) Structure ......................... 2-M5 (2) PTO Clutch "Engaged" ....................2-M6 (3) PTO Clutch "Disengaged" ....................2-M7 [2] HYDRAULIC PTO CLUTCH ....................
Page 158: Structure
G23-2, G26-2, WSM TRANSAXLE 1. STRUCTURE (1) HST Section (5) Brake Section From Engine [C] Transaxle Case Front (2) Pinion Shaft (6) Rear Axle (LH) Section To Differential Gear and Section (3) Hydraulic Pump Section (7) Differential Gear Section Rear Axle...
Page 159: Hst Section
G23-2, G26-2, WSM TRANSAXLE 2. HST SECTION (1) Relief Valve (Reverse) (8) HST Pump Shaft (14) Swash plate and Cradle Front Side (2) Oil Passage (9) Poppet L Bearing Rear Side (3) Centre Case (10) Spring (15) HST Motor Shaft...
Page 160: Rear Axle
G23-2, G26-2, WSM TRANSAXLE 3. REAR AXLE (1) Rear Axle (LH) (10) Final Inner Cover (19) Spiral Bevel Gear (28) Cir-clip (2) Oil Seal (11) Machine Frame (20) Ball Bearing (29) Differential Lock Spring (3) Cir-clip (12) Oil Seal (21) Shim...
Page 161: Brake
G23-2, G26-2, WSM TRANSAXLE 4. BRAKE (1) Brake Pedal (2) Brake Rod (3) Brake Spring (4) Brake Cam Lever (5) Parking Lock Pedal (6) O-ring (7) Cir-clip (8) Friction Plate (9) Brake Disk (10) Friction Plate (11) Cir-clip (12) Actuator...
Page 162: Pto Clutch
G23-2, G26-2, WSM TRANSAXLE 5. PTO CLUTCH [1] MECHANICAL PTO CLUTCH (1) Structure (1) Pulley (7) Front PTO Bracket (13) Spring (19) Tension PTO Pulley (2) Ball Bearing (8) Engine Mounting Bracket (LH) (14) PTO Wire Bracket (20) Release Arm...
Page 163: Pto Clutch "Engaged
G23-2, G26-2, WSM TRANSAXLE (2) PTO Clutch "Engaged" (1) Pulley (Engine Flywheel Side) (5) Spring (9) Pulley (PTO Clutch Side) (13) Release Arm (2) Spring (6) PTO Wire Bracket (10) Brake Shoe (14) Tension PTO Pulley (3) Tension PTO Arm...
Page 164: Pto Clutch "Disengaged
G23-2, G26-2, WSM TRANSAXLE (3) PTO Clutch "Disengaged" (1) Pulley (Engine Flywheel Side) (5) Spring (9) Pulley (PTO Clutch Side) (12) PTO Brake Assembly (2) Spring (6) PTO Wire Bracket (10) Brake Shoe (13) Release Arm (3) Tension PTO Arm...
Page 165: Hydraulic Pto Clutch
G23-2, G26-2, WSM TRANSAXLE [2] HYDRAULIC PTO CLUTCH (1) Structure (1) PTO Cap (9) Plate (Disk) (17) Cir-clip (25) Brake Plate (2) Cir-clip (10) Plate (Separate) (18) Oil Seal (26) Brake Disk (3) O-ring (11) PTO Front Case (19) Cir-clip...
Page 166: Pto Clutch "Engaged
G23-2, G26-2, WSM TRANSAXLE (2) PTO Clutch "Engaged" (1) Belt Driven Pulley (7) Brake Spring PTO Clutch "Engaged" PTO Clutch "Disengaged" (2) Front Case (8) Front PTO Shaft High Pressurized Hydraulic Oil Passage to Oil Tank in (3) Spline Boss...
Page 167: Pto Clutch "Disengaged
G23-2, G26-2, WSM TRANSAXLE (3) PTO Clutch "Disengaged" (1) Pulley (5) Separate Plate (9) Brake Plate PTO Clutch "Disengaged" (2) Case (6) Clutch Piston (10) Brake Disc PTO Clutch "Engaged" (3) Spline Boss (7) Brake Spring (4) Disk Plate (8) PTO Clutch Case When the PTO lever is set to "DISENGAGED"...
Page 168 SERVICING CONTENTS 1. TROUBLESHOOTING.........................2-S1 2. SERVICING SPECIFICATIONS ....................2-S5 3. TIGHTENING TORQUES......................2-S6 4. CHECKING, DISASSEMBLING AND SERVICING ..............2-S7 [1] CHECKING AND ADJUSTING....................2-S7 [2] PREPARATION ........................2-S15 (1) Separating Transaxle ....................2-S15 [3] DISASSEMBLING .......................2-S25 (1) Transaxle........................2-S25 (2) PTO Clutch ........................2-S34 [4] SERVICING .........................2-S37 (1) Hydrostatic Transmission ....................2-S37 (2) Transaxle Case ......................2-S39 (3) Brake ..........................2-S40...
Page 169: Troubleshooting
G23-2, G26-2, WSM TRANSAXLE 1. TROUBLESHOOTING HYDROSTATIC TRANSMISSION Reference Symptom Probable Cause Solution Page System Will Not Oil level is low Check oil level or fill G-19 Operate in Either oil to proper level Direction Speed control pedal linkage damaged...
Page 170 G23-2, G26-2, WSM TRANSAXLE Reference Symptom Probable Cause Solution Page Loss of Power Oil level is low Check oil level or fill 2-S15 oil to proper level Speed control pedal linkage damaged Repair linkage 2-S9, 2-S18 Charge pressure is too low 1.
Page 171 G23-2, G26-2, WSM TRANSAXLE TRAVELLING GEAR SHIFT SECTION Reference Symptom Probable Cause Solution Page Noise From Transmission oil insufficient Refill G-19 Transmission Gear worn or broken Replace 2-S31 Bearings worn Replace – Gear Slip Out of Mesh Shift fork spring tension insufficient...
Page 172 G23-2, G26-2, WSM TRANSAXLE PTO CLUTCH SECTION Reference Symptom Probable Cause Solution Page PTO Clutch Slip Operating pressure is low Check 2-S14 PTO clutch valve malfunctioning Repair or replace 2-S34 Clutch disk or drive plate excessively worn Replace 2-S34 Deformation of clutch piston...
Page 173: Servicing Specifications
G23-2, G26-2, WSM TRANSAXLE 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Charge Relief Valve Setting Pressure 0.4 to 0.6 MPa – • Oil temperature 4.1 to 6.1 kgf/cm 50 °C (122 °F) 60 to 80 psi High Pressure Relief Valve Setting Pressure 24.0 to 25.0 MPa...
Page 174: Tightening Torques
G23-2, G26-2, WSM TRANSAXLE 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-12.) Item N·m kgf·m lbf·ft...
Page 175: Checking, Disassembling And Servicing
G23-2, G26-2, WSM TRANSAXLE 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Checking Parking Brake CAUTION To avoid personal injury: • Park the machine on a firm and level surface. • Stop the engine, remove the key, lower the mower and grass catcher to the lowest position, and chock the wheels before checking.
Page 176 G23-2, G26-2, WSM TRANSAXLE Adjusting Maximum Speed  Forward 1. Depress the speed control pedal (4) all the way and lengthen the stopper bolt (2) until it touches the HST pedal stay (3). 2. Adjust the stopper bolt (2) length "A" to 20 mm (0.79 in.) and lock it securely.
Page 177 G23-2, G26-2, WSM TRANSAXLE Adjustment of HST Neutral Position 1. Start the engine. 2. Keep the engine at the maximum revolution. 3. Loosen the locking screw (2). NOTE • When adjusting the HST neutral position, loosen the locking screw approximately 2 turns counterclockwise not to drop the nut inside.
Page 178 G23-2, G26-2, WSM TRANSAXLE High Relief Pressure (Forward) CAUTION • When checking, park the machine on flat ground. • This work must be done by two personnel. 1. Lift up the rear wheels by supporting the machine frame and remove the rear wheels.
Page 179 G23-2, G26-2, WSM TRANSAXLE High Relief Pressure (Reverse) CAUTION • When checking, park the machine on flat ground. • This work must be done by two personnel. 1. Lift up the rear wheels by supporting the machine frame and remove the rear wheels.
Page 180 G23-2, G26-2, WSM TRANSAXLE Checking and Adjusting HST Neutral Spring (for Dynamic Braking) WARNING • Do not operate if machine moves on level ground with foot off speed control pedal. • If machine moves on level ground with foot off the pedal, or, if the pedal is too slow in returning to "Neutral"...
Page 181 Readjustment of Relief Valve (When the HST does not Work Due to its Loose Hexagon Socket Head Screw) IMPORTANT • KUBOTA does not recommend the readjustment of relief valve. KUBOTA recommends with genuine parts. • As the HST may be damaged if the pressure is set to high by mistake, be careful when adjusting it.
Page 182 G23-2, G26-2, WSM TRANSAXLE PTO Clutch Operating Pressure CAUTION • When checking, park the machine on flat ground, apply the parking brake. 1. Lift the rear of the tractor and remove the left rear wheel. 2. Disconnect the PTO clutch delivery hose (2) from the PTO...
Page 183: Preparation
G23-2, G26-2, WSM TRANSAXLE [2] PREPARATION (1) Separating Transaxle Draining Transmission Fluid CAUTION • Be sure to stop the engine before checking and changing the transmission fluid. 1. Place oil pan under the machine. 2. remove the drain plug (1), (2) at the bottom of the transmission case.
Page 184 G23-2, G26-2, WSM TRANSAXLE Grass Collector 1. Hook the grass collector with the nylon slings. 2. Support the grass collector with a garage jack to remove the grass collector pins (5) easily. 3. Remove the grass collector pins (5). 4. Disconnect the wiring harness coupler (6).
Page 185 G23-2, G26-2, WSM TRANSAXLE Seat 1. Disconnect the seat switch connector (3). 2. Remove the snap pin (2). 3. Remove the seat (1). (1) Seat (3) Seat Switch Connector (2) Snap Pin 9Y1210892TXS0018US0 2-S17 KiSC issued 02, 2014 A...
Page 186 G23-2, G26-2, WSM TRANSAXLE Speed Control Pedal and Fender 1. Remove the speed control pedal (2). 2. Remove the parking brake lever (7). 3. Remove the handrails (4), (6) and the lever grips (5). 4. Disconnect the wiring harness, the fuel hoses and the fuel feed pump under the fender.
Page 187 G23-2, G26-2, WSM TRANSAXLE Hydraulic Control Valve 1. Disconnect the couplers from the safety switches (10), (11). 2. Disconnect the hydraulic pipe (7) from the hydraulic control valve (1). 3. Remove the spring (4). (G26 only) 4. Remove the fender bracket mounting bolts.
Page 188 G23-2, G26-2, WSM TRANSAXLE Fuel Tank 1. Disconnect the fuel hose from the fuel tank (1). 2. Remove the fuel tank stay (2). 3. Disconnect the fuel hose from the fuel tank bottom side not to leak fuel from the fuel tank.
Page 189 G23-2, G26-2, WSM TRANSAXLE Grass Collector Support Assembly 1. Disconnect the wiring harness (4) from the grass collector support assembly (1). 2. Support the machine frame. 3. Remove the rear tyres (5). 4. Hook the grass collector support assembly (1) with a nylon sling.
Page 190 G23-2, G26-2, WSM TRANSAXLE Duct Plate 1 1. Remove the bolts (3). 2. Remove the plates (2), (5). 3. Remove the duct plate (7) from the machine body. 4. Remove the transmission mounting bolts (1). (When reassembling) 124 to 147 N·m...
Page 191 G23-2, G26-2, WSM TRANSAXLE Assembling Duct Plate 3 1. Reassemble the parts to the original position referring to the pictures. (1) Frame (7) Duct (2) Lower Duct (8) Rue Ring Cotter (3) Duct Plate (LH) (9) Duct Lock Plate (4) Duct Flat Rod...
Page 192 G23-2, G26-2, WSM TRANSAXLE Separating Transmission Assembly 1. Remove the wiring harness (1) from the transmission case assembly (8). 2. Disconnect the hydraulic pipe (2) from the transmission case assembly (8). 3. Disconnect the HST damper (3) and the brake rod (7).
Page 193: Disassembling
G23-2, G26-2, WSM TRANSAXLE [3] DISASSEMBLING (1) Transaxle Outer Parts and Rear Axle 1. Disconnect the hydraulic pipes (1), (2). 2. Remove the rear axle case mounting bolts (4). 3. Remove the rear axle cases (3), (5). (When reassembling) • Do not damage the O-ring.
Page 194 G23-2, G26-2, WSM TRANSAXLE Rear Axle Case 1. Remove the rear axle case docking bolts (1). And remove the final inside cover (3). 2. Remove the chain tensioner (7) and gear shaft (8). (When reassembling) • Apply liquid gasket (Three Bond 1216E or equivalent) to the joint surface of the final outside cover and the final inner cover.
Page 195 G23-2, G26-2, WSM TRANSAXLE Rear Axle and Drive Chain 1. Remove the oil seal (3) from the final outside cover (5). 2. Remove the cir-clip (2) with a long nose snap ring pliers. 3. Remove the cir-clip (6) from the rear axle (4).
Page 196 G23-2, G26-2, WSM TRANSAXLE Brake 1. Remove the internal cir-clip (1), friction plate (2), brake discs (3), friction plates (9) and actuator (7). 2. Remove the external cir-clip (5) from the brake cam lever (4). 3. Remove the brake cam lever (4) from final outer side cover (8).
Page 197 G23-2, G26-2, WSM TRANSAXLE Hydraulic Parts 1. Remove the relief valve (1). 2. Remove the hydraulic pump (2). 3. Remove the oil filter (3). 4. Remove the flow priority valve (4). (When reassembling) • Check the O-ring before reassembling. • Clean the oil filter and line filter before reassembling.
Page 198 G23-2, G26-2, WSM TRANSAXLE Brake Case 1. Remove the spring (1). 2. Remove the brake cover mounting bolts (3). 3. Remove the spring plate (2) and the brake case assembly. (When reassembling) • Replace the front gasket with a new one.
Page 199 G23-2, G26-2, WSM TRANSAXLE HST Pump Shaft, HST Motor Shaft and Pinion Shaft 1. Remove the HST pump shaft (6) and the HST motor shaft (1) from the transmission case (4). 2. Remove the gear pump idle gear (5) from the transmission case (4).
Page 200 G23-2, G26-2, WSM TRANSAXLE Differential Gear Side Shim 1. Remove the cir-clips (1), (5). 2. Remove the shims (3), (7). (When reassembling) • Install the same shim to the same position. (1) Cir-clip (LH) (5) Cir-clip (RH) (2) Transmission Case...
Page 201 G23-2, G26-2, WSM TRANSAXLE Differential Gear Assembly 1. Remove the differential gear (3) and the differential rear case (4) from the transmission case (2). (When reassembling) • Install the same shim (10) to the same position. • After installing the shim, check and adjust the differential gear backlash.
Page 202: Pto Clutch
G23-2, G26-2, WSM TRANSAXLE (2) PTO Clutch Mechanical PTO Clutch 1. Remove the mechanical PTO clutch assembly (1) from the machine body. 2. Remove the cir-clip (14). 3. Disassemble the mechanical PTO clutch assembly (1). (When reassembling) • Adjust clearance between the tension PTO arm and the release arm.
Page 203 G23-2, G26-2, WSM TRANSAXLE Hydraulic PTO Clutch 1 1. After removing the hydraulic PTO clutch assembly from the machine, remove the cir-clip (1), (2). 2. Remove the pulley (3) from the PTO clutch front case (4). (1) Cir-clip (4) Front Case...
Page 204 G23-2, G26-2, WSM TRANSAXLE Hydraulic PTO Clutch 3 1. Remove the cir-clip (1). 2. Remove the backing plate (5), the disk plates (6), and the separate plates (7) from the clutch case (3). 3. Remove the cir-clip (9) and the oil seal (8).
Page 205: Servicing
G23-2, G26-2, WSM TRANSAXLE Hydraulic PTO Clutch 4 1. Press the brake spring (6) by using the PTO clutch spring compression tool (2). 2. Remove the cir-clip (1) by a snap ring pliers. 3. Disassemble the PTO clutch. (When reassembling) •...
Page 206 G23-2, G26-2, WSM TRANSAXLE Charge Valve 1. Check the charge valve (1). 2. If problems are found, replace it. (1) Charge Valve 9Y1210892TXS0043US0 Check and High Pressure Relief Valve, and By-pass Valve 1. Check the check and high pressure relief valve (3), (4), and the by-passe valve (5) for scratches and damage.
Page 207: Transaxle Case
G23-2, G26-2, WSM TRANSAXLE HST Pump Shaft 1. Check the seal surface (2), the bearing surface (1), and the O-ring surface (3). 2. If the pump shaft is rough or grooved, replace it. 3. If the ball bearing or the needle bearing is worn, replace it.
Page 208: Brake
G23-2, G26-2, WSM TRANSAXLE Backlash between Spiral Bevel Pinion Gear and Bevel Gear 1. Temporarily assemble the spiral bevel pinion gear (1) and the bevel gear (2) in the transaxle case. 2. Prepare the fuse bent already three to four times.
Page 209: Mechanical Pto Clutch
G23-2, G26-2, WSM TRANSAXLE Height of Cam Plate and Ball 1. Measure the height of the cam plate with the ball installed. 2. If the measurement is less than the allowable limit, replace the cam plate and balls. 3. Inspect the ball holes of cam plate for uneven wear.
Page 210 G23-2, G26-2, WSM TRANSAXLE PTO Clutch Disk Plate Wear 1. Measure the thickness of PTO clutch disk with vernier calipers. 2. If the thickness is less than the allowable limit, replace it. 1.50 to 1.70 mm Factory specification 0.0591 to 0.669 in.
Page 211 G23-2, G26-2, WSM TRANSAXLE PTO Brake Plate 1. Measure the PTO brake plate thickness with a vernier caliper. 2. If the thickness is less than allowable limit, replace it. 1.9 to 2.1 mm Factory specification 0.075 to 0.082 in. PTO brake plate thickness 1.82 mm...
Page 212: Front Axle
FRONT AXLE KiSC issued 02, 2014 A...
Page 213 SERVICING CONTENTS 1. TROUBLESHOOTING.........................3-S1 2. SERVICING SPECIFICATIONS ....................3-S2 3. TIGHTENING TORQUES......................3-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............3-S4 [1] CHECKING AND ADJUSTING....................3-S4 [2] DISASSEMBLING AND ASSEMBLING ................3-S5 (1) Separating Front Axle Assembly ..................3-S5 (2) Disassembling Front Axle....................3-S8 [3] SERVICING ...........................3-S9 KiSC issued 02, 2014 A...
Page 214: Troubleshooting
G23-2, G26-2, WSM FRONT AXLE 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Front Wheels Wander Improper toe-in adjustment Adjust 3-S4 to Right or Left Uneven tyre pressure Adjust G-62 Worn kingpin Replace front axle 3-S7 assembly Front Wheels Improper toe-in adjustment...
Page 215: Servicing Specifications
G23-2, G26-2, WSM FRONT AXLE 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Front Wheel Alignment Toe-in 0 to 5 mm – 0 to 0.2 in. Front Axle Rocking force 20.0 to 300 N – 2.04 to 30.5 kgf 4.50 to 67.4 lbf...
Page 216: Tightening Torques
G23-2, G26-2, WSM FRONT AXLE 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-12.) Item N·m kgf·m lbf·ft...
Page 217: Checking, Disassembling And Servicing
G23-2, G26-2, WSM FRONT AXLE 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Toe-in 1. Inflate the front tyres to the specified pressure. 2. Turn the front wheels straight ahead, and measure the toe-in (B-A). 3. If the measurement is not within the factory specifications, charge the tie-rod length to adjust.
Page 218: Disassembling And Assembling
G23-2, G26-2, WSM FRONT AXLE [2] DISASSEMBLING AND ASSEMBLING (1) Separating Front Axle Assembly Dismounting Mower 1. Raise the mower deck to the top position. Disconnect the universal joint (4). For installation and uninstallation, set the anti-scalp rollers (Front) as shown the figure below.
Page 219 G23-2, G26-2, WSM FRONT AXLE Front Weight, Battery Negative Cable, Bonnet and PTO Cover 1. Remove the front weight from the front weight bracket (2). 2. Disconnect the battery negative cable from the battery. 3. Open the bonnet (7) and disconnect the connectors (5) from the head lights.
Page 220 G23-2, G26-2, WSM FRONT AXLE Separating Front Axle Assembly 1. Disconnect the hydraulic hoses (1), (6) from the power steering cylinder (2). 2. Remove the split pin (5). 3. Loosen the nut (4). 4. Hook the machine with a nylon sling.
Page 221: Disassembling Front Axle
G23-2, G26-2, WSM FRONT AXLE (2) Disassembling Front Axle Kingpin and Bush 1. Remove the split pins (3) and the nuts (2). 2. Remove the power steering cylinder mounting bolts (M10). 3. Remove the power steering cylinder assembly (4) from the front case assembly(8).
Page 222: Servicing
G23-2, G26-2, WSM FRONT AXLE [3] SERVICING Clearance between Centre Pin and Bushing 1. Measure the centre pin O.D. with an outside micrometer. 2. Measure the bushing I.D. of the front axle with a cylinder gauge. 3. If the clearance exceeds the allowable limit, replace it.
Page 223 STEERING KiSC issued 02, 2014 A...
Page 224 MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT ....................... 4-M1 [1] G23 MECHANICAL PTO CLUTCH MODEL ................ 4-M1 [2] G26 HYDRAULIC PTO CLUTCH MODEL ................4-M2 2. STEERING CONTROLLER......................4-M3 3. STEERING CYLINDER ......................4-M4 KiSC issued 02, 2014 A...
Page 225: Hydraulic Circuit
G23-2, G26-2, WSM STEERING 1. HYDRAULIC CIRCUIT [1] G23 MECHANICAL PTO CLUTCH MODEL (1) HST Pump Shaft Cylinder / Piston (2) Oil Strainer (3) Hydraulic Pump (4) Engine (5) Relief Valve (6) Hydraulic Control Valve Assembly (7) Flow Priority Valve...
Page 226: G26 Hydraulic Pto Clutch Model
G23-2, G26-2, WSM STEERING [2] G26 HYDRAULIC PTO CLUTCH MODEL (1) HST Pump Shaft Cylinder / Piston (2) Oil Strainer (3) Hydraulic Pump (4) Engine (5) Relief Valve (6) Hydraulic Control Valve Assembly (7) Flow Priority Valve (8) Relief Valve (Oil Filter)
Page 227: Steering Controller
G23-2, G26-2, WSM STEERING 2. STEERING CONTROLLER The steering controller consists of a control valve (4) and a metering device (3).  Control Valve The control valve is a rotating spool type. When the steering wheel is not turned, the position of the spool (7) and sleeve (9) is kept neutral by the centering spring (8).
Page 228: Steering Cylinder
G23-2, G26-2, WSM STEERING 3. STEERING CYLINDER (1) Rod (4) Guide (7) Center Piston (10) Cylinder Tube (2) Wiper Seal (5) O-ring (8) Piston O-ring (11) Rod O-ring (3) Internal Snap Ring (6) Seal Ring (9) External Snap Ring The steering cylinder is single piston both rod double-acting type. This steering cylinder is installed parallel to the front axle and connected to tie-rods.
Page 229 SERVICING CONTENTS 1. TROUBLESHOOTING.........................4-S1 2. SERVICING SPECIFICATIONS ....................4-S2 3. TIGHTNING TORQUES ......................4-S3 4. CHECKING DISASSEMBLING AND SERVICING ..............4-S4 [1] CHECKING..........................4-S4 (1) Power Steering Relief Valve....................4-S4 [2] DISASSEMBLING .........................4-S5 (1) Power Steering Cylinder....................4-S5 (2) Power Steering Controller ....................4-S7 [3] SERVICING ...........................4-S8 KiSC issued 02, 2014 A...
Page 230: Troubleshooting
G23-2, G26-2, WSM STEERING 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Cannot Be Steered Steering controller malfunctioning Replace 4-S7 Hard Steering Power steering oil improper Change with specified Hydraulic pump malfunctioning Replace 5-S9 Flow priority valve malfunctioning Repair or replace...
Page 231: Servicing Specifications
G23-2, G26-2, WSM STEERING 2. SERVICING SPECIFICATIONS POWER STEERING BODY Item Factory Specification Allowable Limit Relief Valve Operating 8.34 to 8.82 MPa – Pressure 85.0 to 90.0 kgf/cm 1210 to 1270 psi STEERING CYLINDER Item Factory Specification Allowable Limit Steering Cylinder I.D.
Page 232: Tightning Torques
G23-2, G26-2, WSM STEERING 3. TIGHTNING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-12.) Item N·m kgf·m lbf·ft...
Page 233: Checking Disassembling And Servicing
G23-2, G26-2, WSM STEERING 4. CHECKING DISASSEMBLING AND SERVICING [1] CHECKING (1) Power Steering Relief Valve Relief Valve Operating Pressure 1. Disconnect the power steering delivery hose L (or R) from steering controller, and set pressure gauge and hose. (Reference) •...
Page 234: Disassembling
G23-2, G26-2, WSM STEERING [2] DISASSEMBLING (1) Power Steering Cylinder Front Axle and Power Steering Cylinder 1. Hook the front axle frame with a nylon sling (4). 2. Remove the front tyres (1). 3. Disconnect the power steering hoses (2).
Page 235 G23-2, G26-2, WSM STEERING Power Steering Cylinder Hose Adaptor and Tie-rod 1. Remove the steering cylinder hose adaptors (4) (6). 2. Remove the tie-rods from the piston rod (7). 3. Remove the cylinder holder (2) and cir-clip (3). (When reassembling) •...
Page 236 G23-2, G26-2, WSM STEERING (2) Power Steering Controller Steering Wheel and Meter Panel 1. Disconnect the battery negative cable (6). 2. Remove the steering wheel cap and the steering wheel mounting nut (3). 3. Remove the steering wheel (4). 4. Disconnect the main switch connector and the combination switch connector (5).
Page 237 G23-2, G26-2, WSM STEERING [3] SERVICING Steering Cylinder I.D. 1. Measure the steering cylinder I.D. with a cylinder gauge. 2. If the cylinder I.D. exceed the allowable limit, replace the cylinder barrel. 40.000 to 40.062 mm Factory specification 1.5748 to 1.5772 in.
Page 238: Hydraulic System
HYDRAULIC SYSTEM KiSC issued 02, 2014 A...
Page 239 MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT ....................... 5-M1 [1] G23 (MECHANICAL PTO, LD MODEL) ................5-M1 [2] G23 (MECHANICAL PTO, HD MODEL) ................5-M2 [3] G26 (HYDRAULIC PTO, LD MODEL) .................. 5-M3 [4] G26 (HYDRAULIC PTO, HD MODEL) ................. 5-M4 2. HYDRAULIC PUMP........................5-M5 3.
Page 240: Power Steering Controller
G23-2, G26-2, WSM HYDRAULIC SYSTEM 1. HYDRAULIC CIRCUIT [1] G23 (MECHANICAL PTO, LD MODEL) (1) Power Steering Cylinder (8) By-pass Valve (14) Oil Strainer (21) Mower Lift Cylinder (2) Power Steering Controller (9) Orifice (15) Hydraulic Pump (22) Grass Collector Dump Control...
Page 241: G23 (Mechanical Pto, Hd Model)
G23-2, G26-2, WSM HYDRAULIC SYSTEM [2] G23 (MECHANICAL PTO, HD MODEL) (1) Power Steering Cylinder (8) By-pass Valve (14) Oil Strainer (21) Mower Lift Cylinder (2) Power Steering Controller (9) Orifice (15) Hydraulic Pump (22) Grass Collector Dump Control (3) Relief Valve (Power Steering)
Page 242: G26 (Hydraulic Pto, Ld Model)
G23-2, G26-2, WSM HYDRAULIC SYSTEM [3] G26 (HYDRAULIC PTO, LD MODEL) (1) Power Steering Cylinder (9) Orifice (16) Transmission Case (23) Grass Collector Dump (2) Power Steering Controller (10) Check and High Pressure (17) Relief Valve (Main) Cylinder (3) Relief Valve (Power Steering)
Page 243: G26 (Hydraulic Pto, Hd Model)
G23-2, G26-2, WSM HYDRAULIC SYSTEM [4] G26 (HYDRAULIC PTO, HD MODEL) (1) Power Steering Cylinder (9) Orifice (16) Transmission Case (23) Grass Collector Dump (2) Power Steering Controller (10) Check and High Pressure (17) Relief Valve (Main) Cylinder (3) Relief Valve (Power Steering)
Page 244: Hydraulic Pump
G23-2, G26-2, WSM HYDRAULIC SYSTEM 2. HYDRAULIC PUMP The hydraulic pump consists of the pump cover (1), the side plate (8), the two spur gears (the drive gear (4) and the driven gear (2)) that are in mesh. The hydraulic pump is driven by the HST pump shaft and the idle gear (12) in the transmission case.
Page 245: Relief Valve
G23-2, G26-2, WSM HYDRAULIC SYSTEM 3. RELIEF VALVE The hydraulic system circuit has a relief valve to restrict the maximum pressure in the circuit. The relief valve is located in the front case (1). The relief valve is a guide piston type with damping effect.
Page 246: Flow Priority Valve
G23-2, G26-2, WSM HYDRAULIC SYSTEM 4. FLOW PRIORITY VALVE The flow priority valve is a flow divider that divides single hydraulic source (hydraulic pump) to actuate two circuits simultaneously. This valve feeds fixedly controlled flow (9.5 L/min, 2.5 U.S.gals/min, 2.1 Imp.gals/min) to the PF port with priority and excessive flow to the EF port.
Page 247: Control Valve
G23-2, G26-2, WSM HYDRAULIC SYSTEM 5. CONTROL VALVE The control valve body (1) consists of the components as shown in the hydraulic circuit and the figure. (1) Valve Body Oil from hydraulic pump (2) Grass Collector Lift Cylinder Oil to transmission case...
Page 248 G23-2, G26-2, WSM HYDRAULIC SYSTEM Control of Hydraulic Oil to Mower Lift Cylinder (Mower Deck "UP") The spool (5) controls the oil to the mower lift cylinder (6). When the spool (5) is pushed into the control valve body (1), the hydraulic oil from the pump is flowed through A1 port to the mower lift cylinder (6).
Page 249 G23-2, G26-2, WSM HYDRAULIC SYSTEM Control of Hydraulic Oil to Grass Collector Dump Cylinder (Grass Collector Opens) When the grass collector control lever is set to "TILT BACKWARD" position, the spool (4) is pushed into the control valve body (1). The hydraulic oil from the pump is flowed through A2 port to the grass collector dump cylinder (7).
Page 250 G23-2, G26-2, WSM HYDRAULIC SYSTEM Control of Hydraulic Oil to Grass Collector Lift Cylinder (Grass Collector "UP") When the grass collector control lever is set to "UP" position, the spool (3) is pushed into the control valve body (1). The hydraulic oil from the pump is flowed thought A3 port to the grass collector lift cylinders (2).
Page 251 G23-2, G26-2, WSM HYDRAULIC SYSTEM 6. LIFT CYLINDER [1] MOWER LIFT CYLINDER This mower lift cylinder consists of the cylinder (1), the rod (3) and other parts as shown in the figure. This mower lift cylinder is a single rod single acting cylinder in which the reciprocating motion of the rod (3) is controlled by the hydraulic oil applied to the rod (3).
Page 252 G23-2, G26-2, WSM HYDRAULIC SYSTEM [4] GRASS COLLECTOR LIFT CYLINDER (HD) (1) Piston Rod (3) Cylinder Tube (5) Nut Cylinder I.D. (2) Head (4) Piston Rod O.D. Stroke Both the grass collector lift cylinder and rotating cylinder of a head (2), cylinder tube (3), piston rod (1), piston (4) and other parts as shown in the figure above.
Page 253 SERVICING CONTENTS 1. TROUBLESHOOTING.........................5-S1 2. SERVICING SPECIFICATIONS ....................5-S3 3. TIGHTENING TORQUES......................5-S4 4. CHECKING, DISASSEMBLING AND SERVICING ..............5-S5 [1] CHECKING AND ADJUSTING....................5-S5 [2] DISASSEMBLING .........................5-S8 (1) Removing Hydraulic Parts ....................5-S8 (2) Disassembling .......................5-S15 [3] SERVICING .........................5-S18 (1) Hydraulic Pump ......................5-S18 (2) Lift Cylinder........................5-S19 KiSC issued 02, 2014 A...
Page 254: Troubleshooting
G23-2, G26-2, WSM HYDRAULIC SYSTEM 1. TROUBLESHOOTING [LD] Reference Symptom Probable Cause Solution Page Mower Does Not Main relief valve spring damaged Replace 5-S5 "RISE" Main relief valve setting pressure too low Adjust 5-S5 Hydraulic pump damaged Replace 5-S9 Mower lift cylinder damaged...
Page 255 G23-2, G26-2, WSM HYDRAULIC SYSTEM [HD] Reference Symptom Probable Cause Solution Page Mower Does Not Main relief valve spring damaged Replace 5-S5 "RISE" Main relief valve setting pressure too low Adjust 5-S5 Hydraulic pump damaged Replace 5-S9 Oil strainer clogged...
Page 256: Servicing Specifications
G23-2, G26-2, WSM HYDRAULIC SYSTEM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Main Relief Valve Setting Pressure 12.3 to 12.8 MPa – 125 to 131 kgf/cm 1790 to 1850 psi Hydraulic Pump Delivery Oil to Power Oil Flow Above –...
Page 257: Tightening Torques
G23-2, G26-2, WSM HYDRAULIC SYSTEM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-12.) [LD] Item N·m kgf·m...
Page 258: Checking, Disassembling And Servicing
G23-2, G26-2, WSM HYDRAULIC SYSTEM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Main Relief Valve Setting Pressure 1. Remove the operator's seat. 2. Remove the mower control cam dial. 3. Remove the plug (4) from the front case (3).
Page 259 G23-2, G26-2, WSM HYDRAULIC SYSTEM Checking Pump Delivery Oil to Power Steering (EF) IMPORTANT • Use the instruction with the flowmeter when you use the flowmeter. • While testing, do not close the flowmeter loading valve completely. 1. Disconnect the power steering (IN) hose (1) from the power steering (IN) tube (3).
Page 260 G23-2, G26-2, WSM HYDRAULIC SYSTEM Checking Pump Delivery Oil to Control Valve IMPORTANT • Use the instruction with the flowmeter when you use the flowmeter. • While testing, do not close the flowmeter loading valve completely. 1. Disconnect the hydraulic delivery hose (1) from the connector (K2581-3665-0) (2) on the front case (3).
Page 261: Disassembling
G23-2, G26-2, WSM HYDRAULIC SYSTEM [2] DISASSEMBLING (1) Removing Hydraulic Parts Oil Strainer 1. Drain the transmission fluid completely after removing the drain plugs at the bottom of the transmission case and both sides on the rear axle case. 2. After draining, reinstall the plugs.
Page 262 G23-2, G26-2, WSM HYDRAULIC SYSTEM Hydraulic Pump 1. Separate the transaxle case from the machine. 2. Remove the hydraulic pump (1) from the front case (2). (1) Hydraulic Pump (2) Front Case 9Y1210892HYS0008US0 Relief Valve and Flow Priority Valve 1. Remove the operator's seat.
Page 263 G23-2, G26-2, WSM HYDRAULIC SYSTEM Hydraulic Control Valve 1. Remove the fender. 2. Remove the hydraulic control valve (1) with the fender bracket (2) and hydraulic oil filter as shown in the pictures. 3. Remove the hydraulic control valve (1).
Page 264 G23-2, G26-2, WSM HYDRAULIC SYSTEM Mower Lift Cylinder 1. Remove the mower. 2. Remove the cylinder cover (1). 3. Disconnect the mower hose (6) from the adaptor of the mower lift cylinder (2). 4. Remove the joint pins (5), (9).
Page 265 G23-2, G26-2, WSM HYDRAULIC SYSTEM Grass Collector Dump Cylinder (LD) 1. Stop the engine. 2. Set the grass collector control lever (1) to "TILT BACKWARD" or "CLOSE" position three or four times and release the inside pressure of the grass collector dump cylinder (5).
Page 266 G23-2, G26-2, WSM HYDRAULIC SYSTEM Grass Collector Dump Cylinder (HD) 1. Remove the grass collector from the machine. 2. Remove the frames (1), (2), (3), (4) as shown in the pictures. 3. Remove the bottom plate (5). 4. Disconnect the rotation hoses (7), (8).
Page 267 G23-2, G26-2, WSM HYDRAULIC SYSTEM Grass Collector Lift Cylinder 1. Remove the grass collector from the machine. 2. Hook the grass collector frame with a hoist. 3. Mark the lift lower hoses (1), (2) with a paint. Disconnect the lift lower hoses (1), (2).
Page 268: Disassembling
G23-2, G26-2, WSM HYDRAULIC SYSTEM (2) Disassembling Hydraulic Pump and Oil Seal 1. Disassemble the hydraulic pump after removing the hydraulic pump from the front case (7). 2. Remove the front case (7). 3. Remove the cir-clip (9) and the oil seal (8).
Page 269 G23-2, G26-2, WSM HYDRAULIC SYSTEM Hydraulic Control Valve NOTE • Do not disassemble the hydraulic control valve (1) because it is not adopted as single part. 1. If the hydraulic control valve is damaged, replace it with a new one.
Page 270 G23-2, G26-2, WSM HYDRAULIC SYSTEM Grass Collector Dump Cylinder (LD / HD) 1. Remove the snap ring (2) with a snap ring pliers. 2. Push the cover (4) to the cylinder inside to make the ring (3) free. 3. Hold the ring (3) with a minus screw driver to make it to be dwindled, and remove the ring (3) from the cylinder sub-assembly (9).
Page 271: Servicing
G23-2, G26-2, WSM HYDRAULIC SYSTEM [3] SERVICING (1) Hydraulic Pump Clearance between Tip of Gear Tooth and Casing 1. Measure the gear O.D. with an outside micrometer. 2. Measure the case (1) I.D. with a cylinder gauge and calculate the clearance.
Page 272: Lift Cylinder
G23-2, G26-2, WSM HYDRAULIC SYSTEM (2) Lift Cylinder Piston Rod Bend 1. Place piston rod on V blocks. 2. Set a dial indicator on the center of the rod. 3. Turn the piston rod and read the dial indicator. 4. If the measurement exceeds the allowable limit, replace it 0.25 mm...
Page 273: Electrical System
ELECTRICAL SYSTEM KiSC issued 02, 2014 A...
Page 274 MECHANISM CONTENTS 1. WIRING DIAGRAM........................6-M1 2. STARTING SYSTEM........................6-M2 [1] ELECTRICAL CIRCUIT ......................6-M2 [2] SAFETY SWITCH ........................ 6-M3 (1) Type of Safety Switch..................... 6-M3 3. CHARGING SYSTEM......................... 6-M4 [1] ELECTRICAL CIRCUIT ......................6-M4 [2] IC REGULATOR (3P CONNECTOR TYPE) ................ 6-M5 4.
Page 275: Wiring Diagram
G23-2, G26-2, WSM ELECTRICAL SYSTEM 1. WIRING DIAGRAM 6-M1 KiSC issued 02, 2014 A...
Page 276: Starting System
G23-2, G26-2, WSM ELECTRICAL SYSTEM 2. STARTING SYSTEM [1] ELECTRICAL CIRCUIT (1) Glow Lamp (6) Glow Plug (10) Brake Switch (4P) (14) Main Switch (2) Grass Collector Relay (7) Slow Blow Fuse (50 A) (11) Seat Switch (OPC) (15) Diode...
Page 277: Safety Switch
G23-2, G26-2, WSM ELECTRICAL SYSTEM [2] SAFETY SWITCH (1) Type of Safety Switch G23 and G26 are equipped with two types of safety switch. The normal open type switch is electrically opened in the normal condition. The normal close type switch is electrically closed in the normal condition.
Page 278: Charging System
G23-2, G26-2, WSM ELECTRICAL SYSTEM 3. CHARGING SYSTEM [1] ELECTRICAL CIRCUIT (1) Hour and Tachometer (4) Electrical Device (7) Battery (9) Main Switch (2) Battery Charge Lamp (5) Fuse (8) Starter Motor (10) Alternator (3) Frame Earth (6) Slow Blow Fuse The charging system supplies electric power for various electrical devices and also charges the battery while the engine runs.
Page 279: Ic Regulator (3P Connector Type)
G23-2, G26-2, WSM ELECTRICAL SYSTEM [2] IC REGULATOR (3P CONNECTOR TYPE) 3P connector is connected to the IC regulator. 3P connector consists of three leads, L (Blue) lead (1), RY (Red / Yellow) lead (2), and WR (White / Red) lead (3).
Page 280: Lighting System
G23-2, G26-2, WSM ELECTRICAL SYSTEM 4. LIGHTING SYSTEM [1] ELECTRICAL CIRCUIT (1) Illumination Light (8) Battery Charge Lamp (15) Flasher Unit (22) Starter Motor (2) Trailer Light (9) Coolant Temperature Gauge (16) Combination Switch (23) Main Switch (3) High Beam...
Page 281: Gauges
G23-2, G26-2, WSM ELECTRICAL SYSTEM 5. GAUGES [1] ELECTRICAL CIRCUIT (1) Hour and Tachometer (4) Fuel Gauge (7) Slow Blow Fuse (10) Main Switch (2) Coolant Temperature Gauge (5) Fuel Sensor (8) Battery (11) Fuse (3) Thermo Unit (6) Frame Earth...
Page 282: Fuel Level Gauge
G23-2, G26-2, WSM ELECTRICAL SYSTEM [3] FUEL LEVEL GAUGE Fuel level gauge and fuel level sensor are connected by the wiring. Fuel level gauge detects the resistance from the fuel lever sensor. Fuel level gauge indicates the fuel level in the fuel tank.
Page 283: Buzzer System
G23-2, G26-2, WSM ELECTRICAL SYSTEM 6. BUZZER SYSTEM [1] ELECTRICAL CIRCUIT Buzzer system consists of the battery (5), the slow blow fuse (2), the main switch (4), the PTO shift lever switch 1 (3), the buzzer (7), the grass collector duct switch (6) and etc..
Page 284 SERVICING CONTENTS 1. TROUBLESHOOTING.........................6-S1 2. SERVICING SPECIFICATIONS ....................6-S5 3. TIGHTENING TORQUES......................6-S6 4. CHECKING, DISASSEMBLING AND SERVICING ..............6-S7 [1] CHECKING AND ADJUSTING....................6-S7 (1) Battery ..........................6-S7 (2) Main Switch ........................6-S8 (3) Starter..........................6-S10 (4) Glow Plug ........................6-S10 (5) Safety Switch.........................6-S11 (6) Operator Presence Control (OPC) Switch..............6-S13 (7) Grass Collector Duct Switch..................6-S14 (8) Grass Collector Buzzer....................6-S14 (9) Fuel Pump ........................6-S14...
Page 285 G23-2, G26-2, WSM ELECTRICAL SYSTEM 1. TROUBLESHOOTING FUSE AND WIRING Reference Symptom Probable Cause Solution Page All Electrical Battery discharged or damaged Recharge or replace G-35 Equipments Do Not Battery positive cable disconnected or improperly Repair or replace – Operate...
Page 286 G23-2, G26-2, WSM ELECTRICAL SYSTEM OPERATOR PRESENCE CONTROL (OPC) Reference Symptom Probable Cause Solution Page Engine Does Not Grass collector switch, seat switch and solenoid Replace 6-S13 Stop fuse blown (10A) Engine stop solenoid timer relay damaged Replace 6-S15 Engine stop solenoid damaged...
Page 287 G23-2, G26-2, WSM ELECTRICAL SYSTEM LIGHTING SYSTEM Reference Symptom Probable Cause Solution Page Headlight Does Not Fuse blown (15 A) Replace G-52 Light Bulb blown Replace G-54 Wiring harness disconnected or improperly Repair or replace – connected (between main switch ON terminal...
Page 288 G23-2, G26-2, WSM ELECTRICAL SYSTEM Reference Symptom Probable Cause Solution Page Oil Pressure Lamp Engine oil pressure too low Repair engine – Lights Up When Engine oil insufficient Fill G-40 Engine Is Running Oil pressure switch damaged Replace 6-S23 Short circuit between oil pressure switch lead Repair –...
Page 289: Servicing Specifications
G23-2, G26-2, WSM ELECTRICAL SYSTEM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Battery Voltage More than 12 V – Potential Less than 0.1 V – Difference Glow Plug Resistance Approx. 0.9 Ω – Alternator Charging Current / 14 to 15 V / –...
Page 290: Tightening Torques
G23-2, G26-2, WSM ELECTRICAL SYSTEM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-12.) Item N·m kgf·m lbf·ft...
Page 291: Checking, Disassembling And Servicing
G23-2, G26-2, WSM ELECTRICAL SYSTEM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING CAUTION • To avoid accidental short circuit, be sure to attach the positive cable to the positive terminal before the negative cable is attached to the negative terminal.
Page 292: Main Switch
G23-2, G26-2, WSM ELECTRICAL SYSTEM Battery Specific Gravity 1. Check the specific gravity of the electrolyte in each cell with a hydrometer. 2. When the electrolyte temperature differs from that at which the hydrometer was calibrated, correct the specific gravity reading following the formula mentioned in (Reference).
Page 293 G23-2, G26-2, WSM ELECTRICAL SYSTEM Main Switch Continuity 1) Main Switch Key at OFF Position 1. Set the main switch OFF position. 2. Measure the resistance with an ohmmeter across the B terminal and the ON terminal, B terminal and ST terminal, B terminal and G terminal.
Page 294: Starter
G23-2, G26-2, WSM ELECTRICAL SYSTEM (3) Starter Motor Test CAUTION • Secure the starter to prevent it from jumping up and down while testing the motor. 1. Disconnect the battery negative cable from the battery. 2. Disconnect the battery positive cable and the leads from the starter.
Page 295: Safety Switch
G23-2, G26-2, WSM ELECTRICAL SYSTEM Glow Plug Continuity 1. Disconnect the lead from the glow plugs. 2. Measure the resistance between the glow plug terminal and the chassis. 3. If 0 ohm is indicated, the screw at the tip of the glow plug and the housing are short-circuited.
Page 296 G23-2, G26-2, WSM ELECTRICAL SYSTEM Brake Pedal Switch Continuity 1. Remove the brake pedal switch (1). 2. Measure the resistance with an ohmmeter across the brake pedal switch terminals. 3. If the resistance values specified below are not indicated, the safety switch is faulty.
Page 297: Operator Presence Control (Opc) Switch
G23-2, G26-2, WSM ELECTRICAL SYSTEM (6) Operator Presence Control (OPC) Switch Seat Switch and Grass Collector Switch Continuity Check 1. Disconnect the 2P connectors from the seat switch. 2. Remove the seat switch (1). 3. Connect the circuit tester to the terminals.
Page 298: Grass Collector Duct Switch
G23-2, G26-2, WSM ELECTRICAL SYSTEM (7) Grass Collector Duct Switch Grass Collector Duct Switch Continuity 1. Remove the grass collector duct switch from the machine. 2. Measure the resistance with an ohmmeter across the switch terminals (1), (4). 3. If the resistance values specified below are not indicated, the grass collector duct switch is faulty.
Page 299: Engine Stop Solenoid
G23-2, G26-2, WSM ELECTRICAL SYSTEM Fuel Pump Continuity 1. Disconnect the 2P connector from the fuel pump. 2. Check the continuity between the connector terminals with an ohmmeter. 3. If it does not conduct, the fuel pump is faulty. 9Y1210892ELS0017US0...
Page 300: Charging System
G23-2, G26-2, WSM ELECTRICAL SYSTEM (12) Charging System Battery Charging Current 1. After starting the engine, disconnect the battery positive cord (+), and connect an ammeter and voltmeter. Then switch on all electrical loads (such as head lights) and measure the charging current.
Page 301 G23-2, G26-2, WSM ELECTRICAL SYSTEM Brush Wear 1. Measure the brush length with vernier calipers. 2. If the measurement is less than allowable limit, replace it. 3. Make sure that the brush moves smoothly. 4. If the brush is damaged, replace it.
Page 302: Combination Switch
G23-2, G26-2, WSM ELECTRICAL SYSTEM (14) Combination Switch Combination Switch 1. Remove the meter panel, and disconnect the combination switch connector. 2. Remove the combination switch (1) and perform the following checks 1) to 8). (1) Combination Switch (6) Yellow Lead...
Page 303 G23-2, G26-2, WSM ELECTRICAL SYSTEM 3) Head Light Switch Continuity When Setting Switch at ON Position 1. Set the light switch to the ON position. 2. Measure the resistance with an ohmmeter across the red / yellow lead (1) to the orange lead (4) and the red / yellow lead (1) to the yellow lead (3).
Page 304 G23-2, G26-2, WSM ELECTRICAL SYSTEM 5) Turn Signal Light Switch Continuity When Setting Switch Knob RIGHT Position 1. Set the turn signal switch knob to the RIGHT position. 2. Measure the resistance with an ohmmeter across the green lead (1) and red / white lead (2), and across to the green lead (1) and green / white lead (3).
Page 305 G23-2, G26-2, WSM ELECTRICAL SYSTEM 7) Hazard Switch Continuity When Setting Switch Knob at OFF Position 1. Set the hazard switch knob to the OFF position. 2. Measure the resistance with an ohmmeter across the black / blue lead (1) and the blue / white lead (2).
Page 306 G23-2, G26-2, WSM ELECTRICAL SYSTEM Flasher Unit 1. Remove the under panel. 2. Disconnect the coupler (2) from flasher unit. 3. Measure the voltage with a voltmeter across the terminal h and terminal c or chassis. 4. If the voltage differ from the battery voltage, the wiring harness is faulty.
Page 307 G23-2, G26-2, WSM ELECTRICAL SYSTEM Charge Lamp (Charging Circuit) 1. Disconnect the 3P connector from the alternator after turning the main switch OFF. 2. Turn the main switch ON and connect a jumper lead from the wiring harness connector terminal (White / Red) to the chassis.
Page 308: Gauge
G23-2, G26-2, WSM ELECTRICAL SYSTEM Engine Oil Pressure Switch Continuity 1. Disconnect the lead (2) from the engine oil pressure switch (1). 2. Measure the resistance with an ohmmeter across the switch terminal and the chassis. 3. If 0 Ω is not indicated in the normal state, the switch is faulty.
Page 309 G23-2, G26-2, WSM ELECTRICAL SYSTEM Coolant Temperature Sensor (Thermo Unit) 1) Lead Terminal Voltage 1. Disconnect the lead from the coolant temperature sensor after turning the main switch OFF. 2. Turn the main switch ON and measure the voltage with a voltmeter across the lead terminal and the chassis.
Page 310: Disassembling And Assembling
G23-2, G26-2, WSM ELECTRICAL SYSTEM [2] DISASSEMBLING AND ASSEMBLING (1) Starter Motor 1. Disconnect the connecting lead (9) from the magnet switch (8). 2. Remove the screws (6), and then separate the end frame (4), yoke (2) and armature (1).
Page 311: Servicing
G23-2, G26-2, WSM ELECTRICAL SYSTEM [3] SERVICING (1) Starter Overrunning Clutch 1. Inspect the pinion for wear or damage. 2. If there is any problem, replace the overrunning clutch assembly. 3. Check that the pinion turns freely and smoothly in the overrunning direction and does not slip in the cranking direction.
Page 312 G23-2, G26-2, WSM ELECTRICAL SYSTEM Brush Holder 1. Check the continuity across the brush holder and the holder support with an ohmmeter. 2. If it conducts, replace the brush holder. 9Y1210892ELS0036US0 Armature Coil 1. Check the continuity across the commutator and armature coil core with an ohmmeter.
Page 313: Alternator
G23-2, G26-2, WSM ELECTRICAL SYSTEM (2) Alternator Bearing 1. Check the bearing for smooth rotation. 2. If it does not rotate smoothly, replace it. WSM000001ELS0039US0 Alternator Components 1. When the alternator does not generate or does not charge the battery, replace the alternator as an assembly.
Page 314 MOWER KiSC issued 02, 2014 A...
Page 315 MECHANISM CONTENTS 1. POWER TRANSMISSION......................7-M1 2. MOWER GEAR CASE POWER TRAIN ..................7-M2 3. LIFTING MECHANISM ....................... 7-M3 KiSC issued 02, 2014 A...
Page 316 G23-2, G26-2, WSM MOWER 1. POWER TRANSMISSION (1) Universal Joint (2) Bevel Gear Case (3) Blade Spindle Case (LH) (4) Blade (LH) The power is transmitted from the engine flywheel to the blades.  Power Transmission Engine flywheel → PTO clutch belts → PTO clutch → Universal joint (1) → Input shaft → Bevel gear case (2) →...
Page 317 G23-2, G26-2, WSM MOWER 2. MOWER GEAR CASE POWER TRAIN (1) Blade Spindle Case (LH) (8) Gear (15) Straight Pin M: RCK54-G26 (2) Gear (9) Bearing Shaft (16) Oil Seal Front (3) Blade Shaft (LH) (10) Gear (17) Centre Case...
Page 318: Lifting Mechanism
G23-2, G26-2, WSM MOWER 3. LIFTING MECHANISM (1) Mower Lift Cylinder (3) Front Arm (5) Height Link (7) Rear Arm (LH) (2) Lift Link (4) Front Arm (LH) (6) Connect Link (8) Lift Lower Link (LH) Mower lift is performed by the mower lift cylinder (1) installed on the machine.
Page 319 SERVICING CONTENTS 1. TROUBLESHOOTING.........................7-S1 2. SERVICING SPECIFICATIONS ....................7-S2 3. TIGHTENING TORQUES......................7-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............7-S4 [1] CHECKING AND ADJUSTING....................7-S4 [2] DISASSEMBLING AND ASSEMBLING ................7-S5 [3] SERVICING .........................7-S15 KiSC issued 02, 2014 A...
Page 320: Troubleshooting
G23-2, G26-2, WSM MOWER 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Blade Does Not Turn PTO clutch system malfunctioning Check PTO clutch 2-S34 Gear or blade shaft broken Replace 7-S11, 7-S13, 7-S14 Share pin broken Replace 7-S8 Blade Speed Is Slow...
Page 321: Servicing Specifications
G23-2, G26-2, WSM MOWER 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Bevel Gears in Gear Box Backlash 0.10 to 0.30 mm 0.40 mm 0.0039 to 0.0118 in. 0.0157 in. 9Y1210892MOS0002US0 7-S2 KiSC issued 02, 2014 A...
Page 322: Tightening Torques
G23-2, G26-2, WSM MOWER 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-12.) Item N·m kgf·m lbf·ft Mower blade screw 98 to 117.6...
Page 323: Checking, Disassembling And Servicing
G23-2, G26-2, WSM MOWER 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Checking Mower Blade CAUTION To avoid personal injury : • Be sure to stop the engine and remove the key. • Blades may be sharp. When you handle blades, wear heavy gloves or wrap end of blade with a rag.
Page 324: Disassembling And Assembling
G23-2, G26-2, WSM MOWER Mower Deck Left Side Height and Right Side Height Adjustment CAUTION To avoid personal injury : • Shut off the engine and remove the key. • Set the parking brake. • Allow the blades to stop before making adjustments.
Page 325 G23-2, G26-2, WSM MOWER Mower Blade (LH) 1. Turn the mower deck over to expose the blade. 2. Wedge a wooden block (3) between the blade (1) and the mower housing. 3. The blade bolt right hand threads, turn counterclockwise to loosen.
Page 326 G23-2, G26-2, WSM MOWER Mower Blade (RH) 1. Turn the mower deck over to expose the blade. 2. Wedge a wooden block (3) between the blade (1) and the mower housing. 3. The blade bolt has left hand threads, and turn clockwise to loosen.
Page 327 1. After removing the blade, remove the share pins (4). 2. Remove the pin holder (2). 3. Remove the spindle guard (7). (When reassembling) • Install the KUBOTA genuine parts for the share pins (4). (1) Spindle Holder (5) Cup Washer (2) Pin Holder...
Page 328 G23-2, G26-2, WSM MOWER Universal Joint, Duct Front Cover and Mower Gear Case 1. Remove the duct front cover (1). 2. Remove the universal joint (3). 3. Remove the blade spindle case mounting bolts (6). 4. Remove the mower gear case assembly (5) from the mower deck.
Page 329 G23-2, G26-2, WSM MOWER Blade Spindle Case 1. Remove the blade spindle case mounting bolts (5). 2. Remove the blade spindle case (LH and RH) (4), (1). (When reassembling) • Apply liquid gasket Three Bond 1208D or its equivalent to the joint surface between the centre case and the blade spindle cases.
Page 330 G23-2, G26-2, WSM MOWER Blade Spindle Case and Blade Shaft 1. Remove the cir-clip (1). 2. Remove the bearing holder (8). 3. Remove the cir-clip (9) from the blade shaft (LH) (13). 4. Remove the blade shaft (LH) (13) and the other parts from the blade spindle case.
Page 331 G23-2, G26-2, WSM MOWER Centre Case and Bevel Gear Case 1. Remove the bevel gear case mounting bolts (3). 2. Remove the bevel gear case (2). 3. Remove the shims (4) from the centre case (1). (When reassembling) • Install the shims to the centre case securely.
Page 332 G23-2, G26-2, WSM MOWER Bevel Gear Case 1. Remove the cir-clip (16) from the output shaft (9). 2. Remove the ball bearing (17) and the gear RH (18). 3. Remove the oil seal (1). 4. Remove the cir-clip (2). 5. Remove the other component parts from the bevel gear case (8).
Page 333 G23-2, G26-2, WSM MOWER Centre Case 1. Turn the bearing shaft (4) to remove the locating ball (10). 2. Remove the locating ball (10). 3. Remove the bearing shaft (4) from the centre case (6). 4. Remove the gear and mark the identification mark with the paint as shown in the picture.
Page 334 G23-2, G26-2, WSM MOWER [3] SERVICING Backlash between Spiral Gear on Input Shaft and Spiral Gear on Output Shaft 1. Remove the cap (7). 2. Place fuse to the spiral gear (5) on the output shaft (4). 3. Push the input shaft (3) and pull the output shaft (4).
Page 335 GRASS COLLECTOR KiSC issued 02, 2014 A...
Page 336: Servicing
SERVICING CONTENTS 1. TROUBLESHOOTING.........................8-S1 2. SERVICING SPECIFICATIONS ....................8-S2 3. TIGHTENING TORQUES......................8-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............8-S4 [1] CHECKING..........................8-S4 [2] DISASSEMBLING GRASS COLLECTOR................8-S5 (1) Disassembling Grass Collector (LD) ................8-S5 (2) Disassembling Grass Collector (HD)................8-S8 KiSC issued 02, 2014 A...
Page 337: Troubleshooting
G23-2, G26-2, WSM GRASS COLLECTOR 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Grass Bag Control Is Transmission oil is low Fill G-19 Not Smooth Engine Shuts Off Grass collector switch damaged Replace 6-S13 When Engage the Fuse blown Replace...
Page 338: Servicing Specifications
G23-2, G26-2, WSM GRASS COLLECTOR 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Grass collector link plate Grass collector bag rear – frame opens smoothly and closes tight. 9Y1210892GCS0002US0 8-S2 KiSC issued 02, 2014 A...
Page 339: Tightening Torques
G23-2, G26-2, WSM GRASS COLLECTOR 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-12.) [LD] Item N·m kgf·m...
Page 340: Checking, Disassembling And Servicing
G23-2, G26-2, WSM GRASS COLLECTOR 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING Grass Collector Bag Rear Frame Opening and Closing Check (HD) NOTE • Grass collector bag rear frame is mechanically connected with the rear arms (LH and RH), the link plates, the link upper plates and the grass collector dump cylinder.
Page 341: Disassembling Grass Collector
G23-2, G26-2, WSM GRASS COLLECTOR [2] DISASSEMBLING GRASS COLLECTOR (1) Disassembling Grass Collector (LD) Dismounting Grass Collector 1. Park the machine on a level ground shut off the engine and remove the key. 2. Turn the lock lever (2) to outside of the machine.
Page 342 G23-2, G26-2, WSM GRASS COLLECTOR Cover and Bag Net 1. Remove the front covers (1), (6). 2. Remove the rear covers (2), (4). 3. Remove the handle (5). 4. Remove the rear centre cover (3) and the rear centre cover (7).
Page 343 G23-2, G26-2, WSM GRASS COLLECTOR Plate and Bag Frame 1. Remove the plate from the frame (1). 2. Remove the nut (2) and the lock collars (4), (5). (When reassembling) • Install the parts to the original position. 4.0 to 5.0 N·m...
Page 344: Disassembling Grass Collector (Hd)
G23-2, G26-2, WSM GRASS COLLECTOR (2) Disassembling Grass Collector (HD) Grass Collector Covers 1. Remove the rear covers (1), (3). 2. Remove the front covers. 3. Remove the rear cover (2). 4. Remove the cover (4). (1) Rear Cover (LH)
Page 345 G23-2, G26-2, WSM GRASS COLLECTOR Lift Cylinder and Lift Upper Arm 1. Disconnect the hydraulic hoses. 2. Remove the lift cylinder (1) from the grass collector. 3. Hook the grass collector frame with a nylon sling (2). 4. Disconnect the lift arm joint (6).
Page 346 G23-2, G26-2, WSM GRASS COLLECTOR Dump Link 1. After removing the lift upper arm (1), the lift lower arm (2) and the upper base, remove the rear arm (5) and the link plate (4). (When reassembling) • Grass collector bag rear frame opening check is needed.
Page 347 G23-2, G26-2, WSM GRASS COLLECTOR Lift Upper Arm and Frame 1. Disconnect the hydraulic hoses. 2. Remove the lift cylinder (5). 3. Remove the lift upper arm (1), the lift lower arm (2) and the upper base (6). 4. Remove the spring plate (9) and the sensor plate (8).
Page 348 G23-2, G26-2, WSM GRASS COLLECTOR Bag Frames and Bottom Plate 1. Remove the bag RH frame (1), the bag LH frame (4) and the bag front frame (3). 2. Remove the dump cylinder (5) from the bottom plate (6). (When reassembling) •...
Page 349 EDITOR : KUBOTA FARM & INDUSTRIAL MACHINERY SERVICE, LTD. 64, ISHIZU-KITAMACHI, SAKAI-KU, SAKAI-CITY, OSAKA, 590-0823, JAPAN PHONE : ( 81 ) 72-241-1129 : ( 81 ) 72-245-2484 E-mail : ks_g.ksos-pub@kubota.com Printed in Japan 2014. 02, S, EI, EI, engusa Code No.9Y111-08921 2013.

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G23-2

Kubota G26-2 Workshop Manual

Information

General

1 Machine Identification

2 General Precautions

3 Handling Precautions for Electrical Parts and Wiring

4 Lubricants, Fuel and Coolant

5 Tightening Torques

6 Maintenance Check List

7 Check and Maintenance

8 Special Tools

9 Tyre Pressure and Wheel

10 Implement Limitations

Mechanism

1 Engine Body

2 Cooling System

Servicing

1 Troubleshooting

2 Servicing Specifications

3 Tightening Torques

4 Checking, Disassembling and Servicing

Mechanism

Servicing

Servicing

Mechanism

1 Hydraulic Circuit

2 Steering Controller

3 Steering Cylinder

Servicing

Mechanism

1 Hydraulic Circuit

2 Hydraulic Pump

3 Relief Valve

4 Flow Priority Valve

5 Control Valve

Servicing

Mechanism

1 Wiring Diagram

2 Starting System

3 Charging System

4 Lighting System

5 Gauges

6 Buzzer System

Servicing

2 Servicing Specifications

3 Tightening Torques

4 Checking, Disassembling and Servicing

Quick Links

Chapters

Troubleshooting

Need help?

Questions and answers

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Summary of Contents for Kubota G26-2