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Toro 38988 Operator's Manual

Commercial walk-behind mower
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Form No. 3362-496 Rev A
Commercial Walk-Behind Mower
Fixed Deck, Pistol Grip, Hydro Drive with a
48in TURBO FORCE
®
Cutting Unit
Model No. 38988—Serial No. 290000001 and Up
To register your product or download an Operator's Manual or Parts Catalog at no charge, go to www.Toro.com.
Original Instructions (EN)

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Summary of Contents for Toro 38988

  • Page 1 Fixed Deck, Pistol Grip, Hydro Drive with a 48in TURBO FORCE ® Cutting Unit Model No. 38988—Serial No. 290000001 and Up To register your product or download an Operator's Manual or Parts Catalog at no charge, go to www.Toro.com. Original Instructions (EN)

  • Page 2: Table Of Contents

    Whenever you need service, genuine Toro parts, or additional information, contact an Authorized Service Contents Dealer or Toro Customer Service and have the model and serial numbers of your product ready. Figure 1 identifies the location of the model and serial numbers Introduction..............
  • Page 3 Operating the Parking Brake ....... 13 Mower Deck Maintenance ........43 Starting and Stopping the Engine ......14 Servicing the Cutting Blades ....... 43 Operating the Neutral Locks....... 15 Adjusting the Blade Brake........45 Operating the Mower Blade Control Knob Replacing the Grass Deflector......

  • Page 4: Safety

    Safety – Never remove gas cap or add fuel with engine running. Allow engine to cool before refueling. Do not smoke. Note: The addition of attachments made by – Never refuel or drain the machine indoors. other manufacturers that do not meet American National Standards Institute certification will cause •...

  • Page 5: Toro Mower Safety

    The following list contains safety information specific to Toro products and other safety information you must • Keep nuts and bolts tight, especially the blade know.
  • Page 6 • Use only genuine replacement parts to ensure that original standards are maintained. • Check brake operation frequently. Adjust and service as required.

  • Page 7: Slope Chart

    Slope Chart...

  • Page 8: Safety And Instructional Decals

    Safety and Instructional Decals Safety decals and instructions are easily visible to the operator and are located near any area of potential danger. Replace any decal that is damaged or lost. 98-0776 1-523552 98-5130 1. Warning—read the Operator’s Manual for instructions on torquing the blade bolt/nut to 75-80 ft-lb (102-106 N-m).
  • Page 9 105-4109 105-4110 99-3943 1. Engine 106-0699 103—2103 106-2733 104-8569 1. Fast 3. Slow 2. Continuous variable setting 106-2743...
  • Page 10 110-2067 110-2068 1. Read the Operator’s Manual. Manufacturer’s Mark 1. Indicates the blade is identified as a part from the original machine manufacturer. 106-2738 1. Park 4. Engine—stop 7. Fast 10. Neutral 2. Drive 5. Engine—run 8. Continuous variable setting 3.

  • Page 11: Product Overview

    Product Overview Figure 3 1. Side discharge 5. Controls 2. Mower deck 6. Handle 3. Recoil starter 7. Caster wheel Figure 4 4. Gas tank 1. Throttle control 6. Handle 2. Speed control lever 7. Drive Lever 3. Ignition switch 8.

  • Page 12: Specifications

    A selection of Toro approved attachments and accessories are available for use with the machine to enhance and expand its capabilities. Contact your Authorized Service Dealer or Distributor or go to www.Toro.com for a list of all approved attachments and accessories.

  • Page 13: Think Safety First

    Important: Do not use fuel additives containing methanol or ethanol. In certain conditions during fueling, static Add the correct amount of gas electricity can be released causing a spark stabilizer/conditioner to the gas. which can ignite the gasoline vapors. A fire Note: A fuel stabilizer/conditioner is most or explosion from gasoline can burn you and effective when mixed with fresh gasoline.

  • Page 14: Starting And Stopping The Engine

    If the parking brake does not hold securely, adjust it. Refer to Servicing the Parking Brake. Children or bystanders may be injured if they move or attempt to operate the machine while it is unattended. Always remove the ignition key and set the parking brake when leaving the machine unattended, even if just for a few minutes.

  • Page 15: Operating The Neutral Locks

    Releasing the Neutral Lock 4. Let engine idle for 30 to 60 seconds before turning the engine off. 1. Squeeze the drive levers back until an increase in 5. To stop the engine, turn the ignition key to off. force is felt. 2.

  • Page 16: The Safety Interlock System

    The safety interlock system is designed to kill the engine when: • The Operator Presence Control (OPC) levers are released with the mower engaged and/or the speed control is out of neutral. • The speed control lever is shifted out of neutral without holding OPC levers or with the brake engaged.

  • Page 17: Backward

    Driving the Machine Forward 2. Set the neutral locks. Refer to Operating Neutral Locks. and Backward 3. Move speed control lever to neutral position. The throttle control regulates the engine speed as Note: The speed control lever can also be used to measured in RPM (revolutions per minute).

  • Page 18: Adjusting The Flow Baffle

    Important: Do not start or operate the machine with the by-pass valves open. Damage to system may occur. Figure 14 1. Cam lock 3. Rotate cam to increase or Figure 13 decrease locking pressure 1. By-pass valve 2. Lever 4. Slot Adjusting the Flow Baffle Positioning the Flow Baffle The mower discharge flow can be adjusted for different...
  • Page 19 • Use in tall, dense grass mowing conditions. • Use in wet conditions. • Lowers the engine power consumption. • Allows increased ground speed in heavy conditions. • This position is similar to the benefits of the Toro SFS mower.

  • Page 20: Transporting Machines

    Side Discharging or Mulching the Grass This mower has a hinged grass deflector that disperses clippings to the side and down toward the turf. Without the grass deflector, discharge cover, or complete grass catcher assembly mounted in place, you and others are exposed to blade contact and thrown debris.

  • Page 21: Adjusting The Caster Position

    4. Hold the blade bolt and remove the nut. Slide the 5. Loosen, but do not remove, the 2 top axle bolts bolt down through the spindle, and change the (Figure 19). spacers as needed (Figure 18). 6. Remove the 2 lower axle bolts (Figure 19). Figure 19 1.

  • Page 22: Adjusting The Handle Height

    2. Remove the latch pin, slide the caster from the support, and change the spacers (Figure 20). 3. Install the caster in the support and insert the latch pin (Figure 20). Adjusting the Handle Height The handle position can be adjusted to match the operator’s height preference.

  • Page 23: Height Of Cut Chart

    Height of Cut Chart Number of spacers Number of 1/4 inch blade spacers below spindle below caster 1/2 inch 3/16 inch (5 (13mm) Axle Position 1 inch (26 1–1/4 inch 1–1/2 inch 1–3/4 inch 2 inch (51 (32 mm) (38 mm) (45 mm) 1–1/8 inch 1–3/8 inch...

  • Page 24: Maintenance

    Maintenance Note: Determine the left and right sides of the machine from the normal operating position. Recommended Maintenance Schedule(s) Maintenance Service Maintenance Procedure Interval • Change the engine oil. After the first 8 hours • Check the mower belt tension. •...

  • Page 25: How To Grease

    How to Grease 1. Disengage the PTO and set the parking brake. 2. Stop the engine, remove the key, and wait for all moving parts to stop before leaving the operating position. 3. Clean the grease fittings with a rag. Make sure to scrape any paint off the front of the fitting(s).

  • Page 26: Engine Maintenance

    Engine Maintenance Servicing the Air Cleaner Service Interval/Specification Foam element: Clean it after every 25 operating hours. Paper element: Check it after every 50 operating hours. Replace it after every 200 operating hours or yearly, which ever comes first. Inspect the foam and paper elements and replace them if they are damaged or excessively dirty.

  • Page 27: Servicing The Engine Oil

    2. Place the air cleaner assembly onto the air cleaner base and secure it with the 2 wing nuts (Figure 24). 3. Place the air cleaner cover into position and tighten the cover knob (Figure 24). Servicing the Engine Oil Service Interval/Specification Figure 26 Change the engine oil as follows:...

  • Page 28: Servicing The Spark Plugs

    3. Apply a thin coat of new oil to the rubber gasket on the replacement filter (Figure 28). 4. Install the replacement oil filter to the filter adapter, turn the oil filter clockwise until the rubber gasket contacts the filter adapter, then tighten the filter an additional 3/4 turn (Figure 28).

  • Page 29: Fuel System Maintenance

    Fuel System 4. Clean around the spark plugs to prevent dirt from falling into the engine and potentially causing Maintenance damage. 5. Remove the spark plugs and the metal washers. Servicing the Fuel Tank Checking the Spark Plugs 1. Look at the center of the spark plugs (Figure 30). If you see light brown or gray on the insulator, the In certain conditions, gasoline is extremely engine is operating properly.

  • Page 30: Servicing The Fuel Filter

    Figure 31 1. Fuel shut-off valve 2. Clamp Figure 32 1. Hose clamp 3. Filter Servicing the Fuel Filter 2. Fuel line Replace the fuel filter after every 200 operating hours or 5. Remove the filter from the fuel lines. yearly, whichever occurs first.

  • Page 31: Drive System Maintenance

    Drive System 7. Check to make sure the safety switch is depressed and there is a 5/16 inch (8 mm) space between the Maintenance actuating tab and the switch. (Figure 34). 8. If needed, adjust switch location to create the Perform the following linkage adjustments when the 5/16 inch (8 mm) space (Figure 34).

  • Page 32: Adjusting The Hydro Control Linkages

    pulled against the neutral spring (neutral position) (Figure 35). Mechanical or hydraulic jacks may fail to 12. Turn the adjusting bolt approximately 1/4 turn support machine and cause a serious injury. clockwise if the wheel is turning in reverse or turn the bolt approximately 1/4 turn counter-clockwise if •...
  • Page 33 Mechanical or hydraulic jacks may fail to support machine and cause a serious injury. • Use jack stands when supporting machine. • Do not use hydraulic jacks. Adjusting the Left Side Linkage 1. Disengage the PTO and set the parking brake. 2.

  • Page 34: Adjusting The Control Rod

    Figure 38 1. Speed control lever 3. spring 2. Rear pivot spring Adjusting the Right Side Linkage Figure 39 1. Hydro control linkage 3. Spring 1. Place the speed control lever in the neutral position. 2. Quick track knob 4. 1 inch (26 mm) 2.

  • Page 35: Adjusting The Tracking

    3. Run the unit and observe the tracking on a level, smooth, hard surface such as concrete or asphalt. 4. If the unit tracks to one side or the other, turn the quick track knob. Turn the knob right to steer right and turn the knob left to steer left (Figure 42).

  • Page 36: Checking The Tire Pressure

    Cooling System Maintenance Cleaning the Air Intake Screen Before each use remove any build-up of grass, dirt or other debris from the cylinder and cylinder head cooling fins, air intake screen on flywheel end, and carburetor-governor levers and linkage. This will help insure adequate cooling and correct engine speed and will reduce the possibility of overheating and mechanical damage to the engine.

  • Page 37: Brake Maintenance

    Brake Maintenance 4. Rotate the lower brake link yoke clockwise into the yoke to tighten the parking brake; rotate the brake link yoke counterclockwise out of the yoke out to Servicing the Brake loosen the parking brake (Figure 46). Before each use, check the parking brake for proper Note: There should be approximately 1/4 inch operation.

  • Page 38: Belt Maintenance

    Belt Maintenance Adjusting the Mower Belt Tension Checking the Belts Adjusting the Tension Check all belts after every 50 operating hours or Adjust the mower belt tension as follows: monthly, whichever occurs first. • After the first 8 operating hours. Look for dirt, wear, cracks and signs of overheating.
  • Page 39 Note: The distance between the belt guide and the mower belt should be 3/4 inch (19 mm) when you engage the mower belt (Figure 50). Adjust the mower belt as necessary. The disengaged belt should not drag or fall off the pulley when the guides are properly adjusted.
  • Page 40 10. Remove the assist arm link from the assist arm and rotate the link to adjust the length. 11. Install the assist arm link into the assist arm and secure it with the hairpin cotter pin (Figure 52). 12. Check if the assist arm hits against the stops correctly.

  • Page 41: Hydraulic System Maintenance

    Hydraulic System 6. If there is no fluid, add fluid to the reservoir until it reaches the cold level of the baffle. Maintenance 7. Run the machine at low idle for 15 minutes to allow any air to purge out of the system and warm fluid. Refer to Starting and Stopping the Engine.
  • Page 42 4. Locate filter under engine base and place drain pan critical area for purging air from the hydraulic system is under filter (Figure 55). between the oil reservoir and each charge pump located on the top of each variable displacement pump. Air 5.

  • Page 43: Mower Deck Maintenance

    Mower Deck 8. If either drive wheel still does not rotate, stop and repeat steps 4 and 5 on the respective pump. If Maintenance wheels rotate slowly, the system may prime after additional running. Recheck hydraulic fluid level. 9. Allow unit to run several minutes after the charge Servicing the Cutting Blades pumps are primed with drive system in the full speed position.
  • Page 44 To ensure optimum performance and continued safety conformance of Checking for Bent Blades the machine, use genuine Toro replacement blades. 1. Rotate the blades until the ends face forward and Replacement blades made by other manufacturers may backward (Figure 58).

  • Page 45: Adjusting The Blade Brake

    Figure 62 1. Blade 2. Balancer Installing the Blades 1. Install the bolt, curved washer, and blade. Select the proper number of spacer(s) for the height-of- cut, and slide the bolt into the spindle (Figure 60). Important: The curved part of the blade must point upward toward the inside of the mower to ensure proper cutting.

  • Page 46: Operating The Mower Blade Control Knob Replacing The Grass Deflector

    Figure 63 1. Spring mounting bolts 3. 1/8-3/16 inch (3mm-5mm) 2. Blade brake pad Figure 64 Replacing the Grass Deflector 1. Bolt 5. Spring installed 2. Spacer 6. Grass Deflector 3. Locknut 7. L end of spring, place behind deck edge before installing bolt 4.

  • Page 47: Storage

    Storage 11. Paint all scratched or bare metal surfaces. Paint is available from your Authorized Service Dealer. 1. Disengage the power take off (PTO), set the parking 12. Store the machine in a clean, dry garage or storage brake, and turn the ignition key to off. Remove the area.

  • Page 48: Troubleshooting

    Troubleshooting Problem Possible Cause Corrective Action Engine will not start, starts hard, or fails 1. Fuel tank is empty. 1. Fill fuel tank with gasoline. to keep running. 2. Fuel shut off valve is closed. 2. Open the fuel shut off valve. 3.
  • Page 49 Problem Possible Cause Corrective Action Blades do not rotate. 1. Mower deck belt is worn or loose. 1. Check the belt tension. 2. Mower deck belt is broken. 2. Install new deck belt. 3. Mower deck belt is off pulley. 3.

  • Page 50: Driving The Machine Forward And Schematics

    Schematics Electrical Schematic (Rev. -) Hydraulic Schematic (Rev. -)
  • Page 51 Notes:...
  • Page 52 Countries Other than the United States or Canada Customers who have purchased Toro products outside the United States or Canada should contact their Toro Distributor (Dealer) to obtain guarantee policies for your country, province, or state. If for any reason you are dissatisfi ed with your Distributor’s service or have diffi culty obtaining guarantee information, contact the Toro importer.

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