Kubota LA344 Workshop Manual
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Kubota LA344 Workshop Manual

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WORKSHOP MANUAL
FRONT LOADER
LA344,LA344S
KiSC issued 02, 2017 A

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Questions and answers

Mike R
January 30, 2025

Can a LA 344 support a backhoe ?

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1 comments:
Mr. Anderson
February 10, 2025

Yes, the Kubota LA344 loader is designed to be mated to the BX23s backhoe model. When labeled as LA344, it is identical to the LA340 but carries a different warranty due to its association with the BX23s backhoe.

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Summary of Contents for Kubota LA344

  • Page 1 WORKSHOP MANUAL FRONT LOADER LA344,LA344S KiSC issued 02, 2017 A...
  • Page 2 TO THE READER This Workshop Manual tells the servicing personnel about the mechanism, servicing and maintenance of KUBOTA Front Loader LA344 and LA344S. It contains 4 parts: "Information", "General", "Mechanism" and "Servicing". INFORMATION This section primarily contains information below. • Safety First •...

  • Page 3: Table Of Contents

    3. Boom cylinder and bucket cylinder ......................3-4 3.1 Structure of boom cylinder and bucket cylinder ................3-4 4. One touch front loader ..........................3-5 4.1 Outline of one touch front loader ....................... 3-5 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 4 4.4 3rd function valve (If equipped) ....................... 3-32 4.4.1 Removing 3rd function valve ....................3-32 4.4.2 Removing hydraulic tubes of 3rd function................3-32 5. Servicing ..............................3-33 5.1 Piston rod ............................3-33 5.1.1 Checking piston rod bend ....................... 3-33 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 5: Information

    INFORMATION KiSC issued 02, 2017 A...

  • Page 6: Safety First

    2. Bypass the safety start switch. • Do not alter or remove any part of machine safety system. • Before you start the engine, make sure that all shift levers are in neutral positions or in disengaged positions. LA344, LA344S KiSC issued 02, 2017 A...

  • Page 7: Operate Safely

    • Do not touch the hot parts or parts that turn when the engine operates. • Do not remove the radiator cap when the engine operates, or immediately after it stops. If not, hot water can spout out from the radiator. Only remove LA344, LA344S KiSC issued 02, 2017 A...

  • Page 8: Keep A Good Airflow In The Work Area

    Obey related times. environmental protection regulations when you • Keep the emergency contact telephone numbers discard oil, fuel, coolant, electrolyte and other near your telephone at all times. dangerous waste. LA344, LA344S KiSC issued 02, 2017 A...
  • Page 9 SAFETY FIRST 1. INFORMATION LA344, LA344S KiSC issued 02, 2017 A...

  • Page 10: 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. LA344, LA344S KiSC issued 02, 2017 A...
  • Page 11 SAFETY DECALS 1. INFORMATION LA344, LA344S KiSC issued 02, 2017 A...
  • Page 12 SAFETY DECALS 1. INFORMATION LA344, LA344S KiSC issued 02, 2017 A...

  • Page 13: Care Of Danger, Warning, And Caution Labels

    • Clean danger, warning and caution labels with soap and water, and dry with a soft cloth. • Replace damaged or missing danger, warning and caution labels with new labels from your local Kubota dealer. • If a component with danger, warning and caution label(s) affixed is replaced with a new part, make sure the new label(s) is (are) attached to the same location(s) as the replaced component.

  • Page 14: Terminology

    (5) Boom cylinder (9) Lock lever (13) Stand (2) Hydraulic control lever (6) Boom (10) Mounting lever (3) Mounting hook (7) Bucket cylinder (11) Stand lever (4) Main frame (8) Bucket (12) Stand rod LA344, LA344S KiSC issued 02, 2017 A...
  • Page 15 TERMINOLOGY 1. INFORMATION 1-10 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 16: Specifications

    1219 mm (48.0 in.) Depth (L) 491 mm (19.3 in.) 470 mm (18.5 in.) Height (M) 465 mm (18.3 in.) 523 mm (20.6 in.) Length (N) 538 mm (21.2 in.) 586 mm (23.1 in.) (Continued) 1-11 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 17: Dimensional Specifications

    125 mm (4.9 in.) 132 mm (38.6 in.) 122 mm (4.8 in.) Overall height in carrying position 981 mm (38.6 in.) 990 mm (39.0 in.) 981 mm (38.6 in.) 990 mm (39.0 in.) 1-12 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 18: Operational Specifications

    Bucket roll-back force at ground level 5456 N (1227 lbf) 5195 N (1168 lbf) Raising time 3.3 sec. Lowering time 2.5 sec. Bucket dumping time 2.7 sec. Bucket rollback time 2.3 sec. 1-13 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 19 SPECIFICATIONS 1. INFORMATION LA344 LA344S (A) Height (mm) (C) At pivot pin (E) Rollback force (kN) (B) Lift capacity (kg) (D) 500 mm forward of pivot pin 1-14 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 20: General

    GENERAL KiSC issued 02, 2017 A...

  • Page 21: Identification

    IDENTIFICATION 1. Loader identification 2. GENERAL IDENTIFICATION 1. Loader identification When contacting your local KUBOTA distributor, always specify front loader serial number (1). (1) Serial number [A] Boom RH inside LA344, LA344S KiSC issued 02, 2017 A...
  • Page 22 IDENTIFICATION 2. GENERAL LA344, LA344S KiSC issued 02, 2017 A...

  • Page 23: General Precautions

    • Remove oil and dirt from parts before you measure. • Use KUBOTA genuine parts for replacement to keep the machine performance and to make sure of safety.
  • Page 24 2. GENERAL LA344, LA344S KiSC issued 02, 2017 A...

  • Page 25: Lubricating System

    2.5 Imp.qts Grease fitting Until grease overflows. Moly Ep type grease KUBOTA original transmission hydraulic fluid "Extreme pressure" and containing Molybdenum disulfide is recommended. This grease may specify "Moly Ep" on it's label. LA344, LA344S KiSC issued 02, 2017 A...
  • Page 26 LUBRICATING SYSTEM 2. GENERAL LA344, LA344S KiSC issued 02, 2017 A...

  • Page 27: Tightening Torques

    6.3 to 7.5 46 to 54 — — — 98.1 to 112 10.0 to 11.5 72.4 to 83.1 — — — 172 to 201 17.5 to 20.5 127 to 148 — — — LA344, LA344S KiSC issued 02, 2017 A...

  • Page 28: American Standard Screws, Bolts And Nuts With Unc Or Unf Threads

    2.5 to 3.5 18 to 25 — — — G3/8 62 to 82 6.3 to 8.4 46 to 60 — — — G1/2 49 to 88 5.0 to 9.0 37 to 65 — — — LA344, LA344S KiSC issued 02, 2017 A...

  • Page 29: Hydraulic Fittings

    3.0 to 5.0 lbf⋅ft NOTE • When connecting a hose with flare nut, after tightening the nut with specified torque, return it at approxi- mately 45 degrees (0.79 rad) and re-tighten it to specified torque. LA344, LA344S KiSC issued 02, 2017 A...
  • Page 30 TIGHTENING TORQUES 2. GENERAL 5.Hydraulic fittings 2-10 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 31: Maintenance Check List

    Check the following points before use. Service intervals Check points Reference page Daily (Each use) Check hydraulic hoses. 2-13 Every 10 hours Apply all grease fittings. 2-13 Every 50 hours Check the main frame mounting bolts. 2-14 2-11 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 32 MAINTENANCE CHECK LIST 2. GENERAL 2-12 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 33: Check And Maintenance

    Tightening torque table Location Bolt or nut Required torque 147 N⋅m Main frame M14 bolts or nuts 15.0 kgf⋅m 108 lbf⋅ft 2-13 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 34: Check Points Of Every 50 Hours

    Check for signs tighten them as follows. of leaks and make sure all fittings are tight. LA344 and LA344S WARNING To avoid personal injury or death: • Escaping the hydraulic fluid under pressure can obtain sufficient force to penetrate skin, causing serious personal injury.

  • Page 35: Special Tools

    42.0 mm (1.65 in.) 10.0 mm (0.4 in.) 58.5 mm (2.30 in.) 14 mm (0.55 in.) 35.0 mm (1.38 in.) 0.122 rad (7°) 40.2 mm dia. (1.583 in. dia.) 48.9 mm dia. (1.925 in. dia.) 2-15 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 36 SPECIAL TOOLS 2. GENERAL 1.Special tools for loader 2-16 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 37: Front Loader

    FRONT LOADER KiSC issued 02, 2017 A...

  • Page 38: Mechanism

    2. The hydraulic pump supplies the high pressured oil to control valve for front loader, control valve for 3 point hitch system, power steering controller, PTO clutch valve and hydrostatic transmission after dividing oil flow by flow priority valve. LA344, LA344S KiSC issued 02, 2017 A...
  • Page 39 12.3 to 12.7 MPa (125 to 130 kgf/cm , 1780 to 1840 psi) 0.5 MPa (5 kgf/cm , 150 to 180 psi) 9.5 L/min. (2.5 U.S.gals/min., 2.1 Imp.gals/min.) to the power steering controller and excessive flow to the front loader LA344, LA344S KiSC issued 02, 2017 A...

  • Page 40: Front Remote Hydraulic Control System (If Equipped)

    Keep the hose from running over a. Push front-hydraulic-valve-main-switch within the circled zone in the following figure. again to disengage the front hydraulic valve. The light of the front-hydraulic-valve-main-switch will turn off. LA344, LA344S KiSC issued 02, 2017 A...

  • Page 41: Boom Cylinder And Bucket Cylinder

    (1) Nut (3) Cylinder tube (5) Piston rod (2) Piston (4) Head Cylinder specifications LA344, LA344S Boom cylinder Cylinder I.D. 40 mm (1.57 in.) Rod O.D. 25 mm (0.98 in.) Stroke 326 mm (12.8 in.)

  • Page 42: One Touch Front Loader

    (6). It is installed to the loader main frame (1). Non-spill structure is adopted in the couplers on the quick coupler base to protect the oil leakage from the hydraulic oil line. LA344, LA344S KiSC issued 02, 2017 A...

  • Page 43: Function Of Auto Lock Attachment And Detachment

    (1). As a result, the side frame (5) is (1) Loader stand (4) Stand rod locked to the main frame (1). (2) Loader arm (5) Stand hook (3) Stand lever (6) Bucket LA344, LA344S KiSC issued 02, 2017 A...

  • Page 44: Rd Function Valve (If Equipped)

    8. 3rd function valve (If equipped) 3. FRONT LOADER 8. 3rd function valve (If equipped) 8.1 Structure of 3rd function valve P1: P1 port B port P2: P2 port C port A port D port LA344, LA344S KiSC issued 02, 2017 A...

  • Page 45: Function Of 3Rd Function Valve

    C port. This extends the bucket cylinder. Return oil from the bucket cylinder enters B port and travels throughout the valve to go to the transmission case through P1 port. P1 P1 port A port C port (a) Low pressure P2 P2 port B port D port (b) High pressure LA344, LA344S KiSC issued 02, 2017 A...

  • Page 46: Activation Switch In On Position

    P1 port. P1: P1 port A port C port (a) Low pressure P2: P2 port B port D port (b) High pressure LA344, LA344S KiSC issued 02, 2017 A...
  • Page 47 MECHANISM 3. FRONT LOADER 8.3rd function valve (If equipped) 3-10 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 48: Servicing

    Clean relief valve. Tractor Bucket does not move. 1. Control valve is damaged Repair or replace control valve. Tractor 2. Bucket cylinder is damaged. Repair or replace bucket cylin- 3-28 der. (Continued) 3-11 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 49 3. Battery voltage is not supplied Check battery supply voltage at 3-18 to front hydraulic valve main front hydraulic valve main switch switch. connector. Replace wiring harness. 4. Relay is damaged. Check or replace relay. 3-18 3-12 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 50: Tightening Torques For Front Loader

    111 to 132 Bucket cylinder piston mounting nut 350 to 400 35.7 to 40.7 259 to 295 Main frame mounting bolt (M14) 11.7 RELATED PAGE 1. General use screws, bolts, and nuts on page 2-7 3-13 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 51: Checking And Adjusting

    (A) Same height (2) Boom fulcrum pin 4. Stop the engine. 5. Apply the adjusting bolts to the right and left stand adjusting blocks as shown in the following figure. (1) Bucket (2) Stand 3-14 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 52 ± 15 mm IMPORTANT • Be careful not to allow the stands to go beyond their adjustable range. Otherwise the stands may get damaged. 15. Lock the stand pin using the lock nut. 3-15 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 53 Otherwise the stands may get damaged in storing them away. 18. Be sure that the stands run parallel with the loader pipe. (1) Stand lever (3) Stand hook (2) Stand 3-16 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 54: Front Hydraulic Valve Main Switch And Relay

    (1) Front hydraulic valve main switch 2. Measure the resistance with an ohmmeter between terminal RB and terminal B. (1) Stand lever 30. Hold the stand by stand hook. 3-17 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 55: Checking Connector Voltage Of Front Hydraulic Valve Main Switch

    (A) Connector of relay 3. If continuity is not established, renew the relay. (1) Front hydraulic valve main switch 2. Turn the main switch on. 3. Measure the voltage between terminal RB and terminal B. 3-18 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 56: 3Rd Function Solenoid Valve

    To start the engine or use the hydraulic control valve, always stay in the operator's seat. 4.1.1 Removing loader CAUTION • Make sure an approved bucket is attached before removing the loader from the tractor. 3-19 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 57 (2) Boom fulcrum pin Angle between ground surface and bucket 3. Slide stand lever downward direction About 20 degrees bottom (A) completely, and release the stand from the stand hook. 3-20 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 58 (1) Safety lock button (1) Hydraulic control lever 8. Down the mounting levers of both sides as shown in the following figure. 3-21 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 59: Reinstalling Loader

    15. Place the protective caps and plugs on the ends of the quick coupler. (1) Protective caps 16. Wear the seat belt and slowly back the tractor away from the loader. 4.1.2 Reinstalling loader CAUTION To avoid personal injury: 3-22 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 60 (B) Clockwise (2) Safety lock button (A) Lower IMPORTANT • Get the quick coupler locked, and move up and down the lever to make sure that the quick coupler is tightly locked. 3-23 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 61 6. Make sure that the mounting levers of both sides are at their low position as shown in the follow figures. (1) Guide boss of side frame (A) Engage (2) Boss of main frame 3-24 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 62 (1) Mount hook (2) Mounting lever (1) Mount hook IMPORTANT • Make sure that the hooks at both sides are properly mounted on the main frame. 3-25 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 63: Bucket, Boom And Hydraulic Cylinders

    15. Make sure that the stand lever is at its low position 4.2.1 Attaching attachments as shown in the following figure. DANGER To avoid personal injury or death • Use of a non-KUBOTA attachment that does not comply with ISO24410 improper...
  • Page 64 6. Push the quick-attach-coupler-handles to the fully (1) Handle (A) Points where the quick at- latched position. (2) Ear plate tach coupler handle contacts (3) Pin slot the ear plate (4) Lock pin 3-27 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 65: Detaching Attachments

    5. Lower the boom of the loader so that the quick- attach-coupler-mounting-plate clears attachment saddle. 6. Back away from the attachment slowly. 3-28 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 66: Removing Piston Rod Assembly

    4.2.5 Removing piston rod assembly 1. Drain hydraulic oil from the cylinder, and secure the tube end of the cylinder in a vise. 2. Remove the cylinder head (1) with the adjustable gland nut wrench (4). 3-29 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 67: Removing Piston Seal And O-Ring

    259 to 295 lbf⋅ft 4.2.7 Removing piston seal and O-ring 1. Remove the piston seal (2) and O-ring (3) from the (1) Piston seal (4) Piston piston (1). (2) Slide jig (3) O-ring 3-30 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 68: Side Frames, Front Guard And Main Frames

    (3) Boom assembly • Tighten to the specified tightening torque. 4.3.2 Removing front guard 115 N⋅m Tightening tor- Main frame mount- 11.7 kgf⋅m 1. Remove the front guard (1). ing bolt (M14) 85 lbf⋅ft 3-31 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 69: 3Rd Function Valve (If Equipped)

    4.4.2 Removing hydraulic tubes of 3rd function (3) Connector 1. Remove the hydraulic hoses (1). 3. Disconnect hydraulic hoses (4). (1) Hydraulic hoses (4) Hydraulic hoses 4. Remove valve stay (5) by removing bolts (6). 3-32 LA344, LA344S KiSC issued 02, 2017 A...

  • Page 70: Servicing

    4. Remove the piping fixtures (4) and disconnect all the hydraulic tubes (5). (4) Piping fixtures (5) Hydraulic tubes 5. Servicing 5.1 Piston rod 5.1.1 Checking piston rod bend 1. Set the piston rod on V blocks. 3-33 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 71 SERVICING 3. FRONT LOADER 5.Servicing 3-34 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 72 2-13 main frame nut daily checking checking torque..........2-14 loader..............2-13 re-tightening............2-13 danger, warning, and caution labels......1-8 mechanical loader frame dimensional specification......... 1-12 structure (standing mechanism)......3-6 elbows................2-9 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 73 3-30 plugs................2-8 relay checking.............3-18 rotating movement............. 2-3 safety decals.............. 1-5 safety labels............... 1-8 screws................2-7 service intervals............2-11 sharp edge..............2-3 side frame removing............3-31 sliding jig..............2-15 start safely..............1-1 LA344, LA344S KiSC issued 02, 2017 A...
  • Page 74 Editor : Farm Machinery International Service Department Address 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 2017. 02, S, EI, EI, engusa Code No.9Y111-17180 KUBOTA Corporation...

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