Groundsmaster® 4300-D Traction Unit

Measured vibration level for right hand = 2.1 m/s²

Measured vibration level for left hand = 2.4 m/s²

Uncertainty Value (K) = 1.18 m/s²

Measured values were determined according to the procedures outlined in EN ISO 5395:2013.

Measured vibration level = 0.9 m/s²

Uncertainty Value (K) = 0.45 m/s²

Measured values were determined according to the procedures outlined in EN ISO 5395:2013.

Check the tire pressure before use; refer to Checking the Tire Pressure.

Important: Maintain pressure in all tires to ensure a good quality-of-cut and proper machine performance. Do not underinflate the tires.

1. Check the engine-oil level before starting the engine; refer to Checking the Engine-Oil Level.

2. Check the hydraulic-fluid level before starting the engine; refer to Checking the Hydraulic System.

3. Check the cooling system before starting the engine; refer to Checking the Cooling System.

Grease the machine before use; refer to Greasing the Bearings and Bushings. Failure to properly grease the machine results in premature failure of critical parts.

Before you start the engine and use the machine, check the oil level in the engine crankcase; refer to Checking the Engine-Oil Level.

Before you start the engine and use the machine, check the cooling system; refer to Checking the Cooling System.

Before you start the engine and use the machine, check the hydraulic system; refer to Checking the Hydraulic Lines and Hoses.

The correct air pressure in the front and rear tires is 83 to 103 kPa (12 to 15 psi).

Important: Maintain pressure in all tires to ensure a good quality of cut and proper machine performance. Do not underinflate the tires.Check the air pressure in all the tires before operating the machine.

Figure 14

Important: This cutting deck often cuts approximately 6 mm (1/4 inch) lower than a reel cutting unit with the same bench setting. It may be necessary to have these rotary cutting deck’s bench set 6 mm (1/4 inch) above that of reels cutting in the same area.

Important: Access to the rear cutting units is greatly improved by removing the cutting unit from the tractor. If the unit is equipped with a Sidewinder®, sidewind the cutting units to the right, remove the rear cutting unit, and slide it out to the right side.

1. Lower the cutting deck to the ground, shut off the engine, and remove the key from ignition switch.

2. Loosen the bolt securing each height-of-cut bracket to the height-of-cut plate (front and each side) as shown in Figure 15.

3. Beginning with front adjustment, remove the bolt.

   

   Figure 15

   1. Height-of-cut bracket
   2. Height-of-cut plate
   3. Spacer

4. While supporting the chamber, remove the spacer (Figure 15).

5. Move the chamber to the desired height of cut and install a spacer into the designated height-of-cut hole and slot (Figure 16).

   

   Figure 16

6. Position the tapped plate in-line with the spacer.

7. Install the bolt finger-tight.

8. Repeat steps through for each side adjustment.

9. Torque all 3 bolts to 41 N∙m (30 ft-lb). Always tighten the front bolt first.

   Note: Adjustments of more than 3.8 cm (1–1/2 inches) may require temporary assembly to an intermediate height to prevent binding (e.g., changing from 3.1 to 7 cm (1.25 to 2.75 inches) height of cut).

The interlock switches stop the machine when you raise from the seat while the traction pedal is pressed. However, the operator may get off the seat while the engine is running and the traction pedal is in the NEUTRAL position. Although the engine continues to run if the PTO switch is disengaged and the traction pedal is released, shut off the before rising from the seat.

1. Park the machine on a level surface, lower the cutting unit, shut off the engine, and set the parking brake.

2. Press the traction pedal. Turn the key in the ignition switch to the ON position.

   Note: If the engine cranks, there is a malfunction in the interlock system. Correct this malfunction before operating the machine.

3. Turn the key in the ignition switch to the ON position, rise from the seat, and move the PTO switch to the ON position.

   Note: The PTO should not engage. If the PTO engages, there is a malfunction in the interlock system. Correct this malfunction before operating the machine.

4. Engage the parking brake, turn the key in the ignition switch to the ON position, start the engine, and move the traction pedal out of the NEUTRAL position.

   Note: The InfoCenter displays "traction denied" and the machine should not move. If the machine does move, there is a malfunction in the interlock system. Correct this malfunction before operating the machine.

To ensure that optimum performance of the parking brake system is met, burnish (break-in) the brakes before use. Set the forward traction speed to 6.4 km/h (4 mph) to match the reverse traction speed. (All 8 spacers moved to the top of the mow speed control.) With the engine at high idle, proceed forward with the mow speed control stop engaged and ride the brake for 15 seconds. Proceed backward at full reverse speed and ride the brake for 15 seconds. Repeat this 5 times waiting 1 minute between each forward and reverse cycle to avoid overheating the brakes. You may need to adjust the brakes after breaking in the machine; refer to Adjusting the Parking Brakes.

During different times of the mowing season or when turf conditions vary, the amount of counterbalance (upward lift) required on the cutting decks can be changed to meet the conditions.

1. Position the machine on a level surface, lower the cutting decks, shut off the engine, engage the parking brake, and remove the key from the ignition switch.

2. In the InfoCenter Settings Menu, scroll down to Counterbalance.

3. Press the right button to select counterbalance and change between the low, medium, and high settings.

   Note: Once the adjustment has been completed, move the machine to a test area and operate the machine with the new setting. The new counterbalanced setting may change the effective height of cut.

The machine is equipped with a diagnostic, light which indicates if the machine detects a malfunction. The diagnostic light is located on the InfoCenter, above the display screen (Figure 17). When the machine is functioning properly and the key switch is moved to the ON/RUN position, the diagnostic light turns on briefly to indicate that the light is working properly. When a machine advisory message displays, the light will illuminate when the message is present. When a fault message is displayed, the light blinks until the fault is resolved.

Figure 17

1. Diagnostic light

Important: The fuel system automatically bleeds itself before starting the engine if you are starting the engine for the first time, the engine has shut off due to lack of fuel, or you have performed maintenance on the fuel system.

Note: Cutting grass at a rate that loads the engine promotes DPF regeneration.

1. Move the machine to the job site.

2. Whenever possible, set the engine-speed switch to high idle.

3. Engage the PTO switch.

4. Gradually move the traction pedal forward and slowly drive the machine over the mowing area.

5. Once the front of the cutting units are over the mowing area, lower the cutting units.

6. Cut grass so that the blades can cut and discharge clippings at a high rate while producing a good quality of cut.

   Note: If the cutting rate is too high, the quality of cut may deteriorate. Reduce the ground speed of the machine or reduce the width of cut to regain high idle engine speed.

7. When the cutting units are over the far edge of the mowing area, lift the cutting units.

8. Perform a tear-shaped turn to quickly line up for your next pass.

The diesel particulate filter (DPF) is part of the exhaust system. The diesel-oxidation catalyst of the DPF reduces harmful gasses and the soot filter removes soot from the engine exhaust.

The DPF regeneration process uses heat from the engine exhaust to incinerate the soot accumulated on the soot filter, converting the soot to ash, and clears the channels of the soot filter so that filtered engine exhaust flows out the DPF.

The engine computer monitors the accumulation of soot by measuring the back pressure in the DPF. If the back pressure is too high, soot is not incinerating in the soot filter through normal engine operation. To keep the DPF clear of soot, remember the following:

• Passive regeneration occurs continuously while the engine is running—run the engine at full engine speed when possible to promote DPF regeneration.

• If the back pressure is too high, the engine computer signals you through the InfoCenter when additional processes (assist and reset regeneration) are running.

• Allow the assist and reset regeneration process to complete before shutting off the engine.

Operate and maintain your machine with the function of the DPF in mind. Engine load at high idle engine speed generally produce adequate exhaust temperature for DPF regeneration.

Important: Minimize the amount of time that you idle the engine or operate the engine at low-engine speed to help reduce the accumulation of soot in the soot filter.

DPF Soot Accumulation

• Over time, the DPF accumulates soot in the soot filter. The computer for the engine monitors the soot level in the DPF.

• When enough soot accumulates, the computer informs you that it is time to regenerate the diesel particulate filter.

• DPF regeneration is a process that heats the DPF to convert the soot to ash.

• In addition to the warning messages, the computer reduces the power produced by the engine at different soot-accumulation levels.

Engine Warning Messages—Soot Accumulation

Indication Level	Fault Code	Engine Power Rating	Recommended Action
Level 1: Engine Warning	Figure 18 Check EngineSPN 3719, FMI 16	The computer de-rates the engine power to 85%	Perform a parked regeneration as soon as possible; refer to Parked Regeneration.
Level 2: Engine Warning	Figure 19 Check EngineSPN 3719, FMI 0	The computer de-rates the engine power to 50%	Perform a recovery regeneration as soon as possible; refer to Recovery Regeneration.

DPF Ash Accumulation

• The lighter ash is discharged through the exhaust system; the heavier ash collects in the soot filter.

• Ash is a residue of the regeneration process. Over time, the diesel particulate filter accumulates ash that does not discharge with the engine exhaust.

• The computer for the engine calculates the amount of ash accumulated in the DPF.

• When enough ash accumulates, the engine computer sends information to the InfoCenter in the form of a system advisory or an engine fault to indicate the accumulation of ash in the DPF.

• The advisory and faults are indications that it is time to service the DPF.

• In addition to the warnings, the computer reduces the power produced by the engine at different ash-accumulation levels.

InfoCenter Advisory and Engine Warning Messages—Ash Accumulation

Indication Level	Advisory or Fault Code	Engine Speed Reduction	Engine Power Rating	Recommended Action
Level 1: System Advisory	Figure 20 Advisory #179	None	100%	Notify your service department that advisory #179 displays in the InfoCenter.
Level 2: Engine Warning	Figure 21 Check EngineSPN 3720, FMI 16	None	The computer de-rates the engine power to 85%	Service the DPF; refer to Servicing the Diesel-Oxidation Catalyst (DOC) and the Soot Filter
Level 3: Engine Warning	Figure 22 Check EngineSPN 3720, FMI 0	None	The computer de-rates the engine power to 50%	Service the DPF; refer to Servicing the Diesel-Oxidation Catalyst (DOC) and the Soot Filter
Level 4: Engine Warning	Figure 23 Check EngineSPN 3251, FMI 0	Engine speed at max torque + 200 rpm	The computer de-rates the engine power to 50%	Service the DPF; refer to Servicing the Diesel-Oxidation Catalyst (DOC) and the Soot Filter

Types of Diesel Particulate Filter Regeneration

Types of diesel particulate filter regeneration that are performed while the machine is operating:

Type of Regeneration	Conditions for DPF regeneration	DPF description of operation
Passive	Occurs during normal operation of the machine at high-engine speed or high-engine load	The InfoCenter does not display an icon indicating passive regeneration.
		During passive regeneration, the DPF processes high-heat exhaust gasses; oxidizing harmful emissions and burning soot to ash.
		Refer to Passive DPF Regeneration.
Assist	Occurs as a result of low-engine speed, low-engine load, or after the computer detects back pressure in the DPF	When the assist/reset-regeneration icon is displayed in the InfoCenter, an assist regeneration is in progress.
		During assist regeneration, the computer controls the intake throttle to increase the exhaust temperature, enabling assist regeneration to occur.
		Refer to Assist DPF Regeneration.
Reset	Occurs after assist regeneration only if the computer detects that assist regeneration did not sufficiently reduce the soot level	When the assist/reset-regeneration icon is displayed in the InfoCenter, a regeneration is in progress.
	Also occurs every 100 hours to reset baseline sensor readings
		During reset regeneration, the computer controls the intake throttle and fuel injectors to increase the exhaust temperature during regeneration.
		Refer to Reset Regeneration.

Types of diesel particulate filter regeneration that require you to park the machine:

Type of Regeneration	Conditions for DPF regeneration	DPF description of operation
Parked	Soot buildup occurs as a result of prolonged operation at low-engine speed or low-engine load. May also occur as a result of using incorrect fuel or oil	When the parked-regeneration icon is displayed in the InfoCenter, a regeneration is requested.
	The computer detects back pressure due to soot buildup and requests a parked regeneration
		• Perform the parked regeneration as soon as possible to avoid needing a recovery regeneration.
		• A parked regeneration requires 30 to 60 minutes to complete.
		• You must have at least a 1/4 tank of fuel in the tank.
		• You must park the machine to perform a recovery regeneration.
		Refer to Parked Regeneration.
Recovery	Occurs as a result of ignoring parked regeneration requests and continuing operation, adding more soot when the DPF is already in need of a parked regeneration	When the recovery-regeneration icon is displayed in the InfoCenter, a recovery regeneration is requested.
		Contact your Authorized Toro Distributor to have a service technician perform the recovery regeneration.
		• A recovery regeneration requires up to 4 hours to complete.
		• You must have at least a 1/2 tank of fuel in the machine.
		• You must park the machine to perform a recovery regeneration.
		Refer to Recovery Regeneration.

Assist DPF Regeneration

Figure 24

Assist/reset-regeneration icon

• The assist/reset-regeneration icon displays in the InfoCenter (Figure 24).

• The computer takes control of the intake throttle to increase the temperature of the engine exhaust.

• While operating the machine, run the engine at full engine speed when possible to promote DPF regeneration.

• The icon displays in the InfoCenter while the assist regeneration is processing.

• Whenever possible, do not shut off the engine or reduce engine speed while the assist regeneration is processing.

  Important: Allow the machine to complete the assist regeneration process before shutting off the engine.

  Note: The assist regeneration is finished processing when the icon disappears from the InfoCenter.

Reset Regeneration

Figure 25

Assist/reset-regeneration icon

• The assist/reset-regeneration icon displays in the InfoCenter (Figure 25).

• The computer takes control of the intake throttle and changes the fuel injection operation to increase the temperature of the engine exhaust.

  Important: The assist/reset-regeneration icon indicates that the exhaust temperature discharged from of your machine may be hotter than during regular operation.

• While operating the machine, run the engine at full engine speed when possible to promote DPF regeneration.

• The icon displays in the InfoCenter while the reset regeneration is processing.

• Whenever possible, do not shut off the engine or reduce engine speed while the reset regeneration is processing.

  Important: Allow the machine to complete the reset regeneration process before shutting off the engine.

  Note: The reset regeneration is finished processing when the icon disappears from the InfoCenter.

Parked Regeneration

Figure 26

Parked-regeneration request icon

• The parked-regeneration requested icon displays in the InfoCenter (Figure 26).

• If a parked regeneration is needed, the InfoCenter displays engine warning SPN 3719, FMI 16 (Figure 27) and the engine computer derates engine power to 85%.

  

  Figure 27

  Important: If you do not complete a parked regeneration within 2 hours, the engine computer derates engine power to 50%.

• A parked regeneration requires 30 to 60 minutes to complete.

• If you are authorized by your company, you need the PIN code to perform the parked-regeneration process.

Preparing to Perform a Parked or Recovery Regeneration

1. Ensure that the machine has at least 1/4 tank of fuel.

2. Move the machine outside to an area away from combustible materials.

3. Park the machine on a level surface.

4. Ensure that the traction control or motion-control levers are in the NEUTRAL position.

5. If applicable, lower the cutting units and shut them off.

6. Engage the parking brake.

7. Set the throttle to the low IDLE position.

Performing a Parked Regeneration

Note: For instructions on unlocking protected menus, refer to Accessing Protected Menus.

1. Access the protected menu and unlock the protected settings submenu (Figure 28); refer to Accessing Protected Menus.

   

   Figure 28

2. Navigate to the MAIN MENU, press the center button to scroll down to the SERVICE MENU, and press the right button to select the SERVICE option (Figure 29).

   Note: The InfoCenter should display the PIN indicator in the upper right corner of the display.

   

   Figure 29

3. In the SERVICE MENU, press the middle button until the DPF REGENERATION options displays, and press the right button to select the DPF REGENERATION option (Figure 30).

   

   Figure 30

4. When the “Initiate DPF Regen. Are you sure?” message displays, press the center button (Figure 31).

   

   Figure 31

5. If the coolant temperature is below 60°C (140°F) the “Insure is running and above 60C/140F” message displays. (Figure 32).

   Observe the temperature in the display, and run the machine at full throttle until the temperature reaches 60°C (140°F), then press the center button.

   Note: If the coolant temperature is above 60°C (140°F) this screen is skipped.

   

   Figure 32

6. Move the throttle control to LOW IDLE and press the center button (Figure 33).

   

   Figure 33

7. The following messages display as the parked regeneration process begins:

   1. The “Initiating DPF Regen.” message displays (Figure 34).

      

      Figure 34

   2. The “Waiting on ” message displays (Figure 35).

      

      Figure 35

   3. The computer determines whether the regeneration runs. One of the following messages displays in the InfoCenter:

      • If the regeneration is allowed, the “Regen Initiated. Allow up to 30 minutes for completion” message displays in the InfoCenter, wait for the machine to complete the parked regeneration process (Figure 36).

        

        Figure 36

      • If the regeneration process is not allowed by the engine computer, the “DPF Regen Not Allowed” message displays in the InfoCenter (Figure 37). Press the left button to exit to the home screen

        Important: If you did not meet all the requirements for regeneration or if less than 50 hours have passed since the last regeneration, the “DPF Regen Not Allowed” message appears.

        

        Figure 37

8. While the regeneration is running, the InfoCenter returns to the home screen and shows the following icons:

   		The engine is cold—wait.
   		The engine is warm—wait.
   		The engine hot—regeneration in progress (percent complete).

9. The parked regeneration is complete when the “Regen Complete” message displays in the InfoCenter. Press the left button to exit to the home screen (Figure 38).

   

   Figure 38

• Front of the machine—the hole in the rectangular pad, under the axle tube, inside each front tire (Figure 40).

  

  Figure 40

  1. Front tie-down

• Rear of the machine—each side of the machine on the rear frame(Figure 41).

  

  Figure 41

  1. Rear tie-down

In an emergency, the machine can be moved by actuating the bypass valve in the variable displacement hydraulic pump and pushing or towing the machine.

Important: Do not push or tow the machine faster than 3 to 4.8 km/h (2 to 3 mph) because internal transmission damage may occur. The bypass valve must be open whenever you push or tow the machine.

1. Locate the bypass valve on the left side of the hydrostat (Figure 42) and rotate the bolt 1–1/2 turns to open and allows fluid to bypass internally.

   Note: Because fluid is bypassed, you can move the machine slowly without damaging the transmission.

   

   Figure 42

   1. Bypass valve

2. Close the bypass valve before starting the engine. However, do not exceed 7 to 11 N∙m (5 to 8 ft-lb) torque to close the valve.

   Important: Running the engine with the bypass valve open will cause the transmission to overheat.

• Use care when loading or unloading the machine into a trailer or a truck.

• Use full-width ramps for loading the machine into a trailer or a truck.

• Tie the machine down securely using straps, chains, cable, or ropes. Both front and rear straps should be directed down and outward from the machine.

• Keep all parts of the machine in good working condition and all hardware tightened, especially blade-attachment hardware. Replace all worn or damaged decals.

• Never allow untrained personnel to service the machine.

• Before adjusting, cleaning, or repairing the machine, do the following:

  1. Move the machine to level ground.

  2. Disengage the drives.

  3. Lower the cutting units.

  4. Move the traction pedal to the NEUTRAL position.

  5. Engage the parking brake.

  6. Move the throttle switch to the LOW-IDLE position.

  7. Shut off the engine and remove the key.

  8. Wait for all moving parts to stop.

• Whenever you park or store the machine, or leave it unattended, lower the cutting units unless you use a positive mechanical lock.

• If possible, do not perform maintenance on the machine while the engine is running. If you must run the engine to perform maintenance on the machine, keep your hands, feet, other body parts, and clothing away from all moving parts, the mower-discharge area, and the underside of the mowers.

• Do not touch parts of the machine or an attachment that may be hot from operation. Allow the parts to cool before attempting to maintain, adjust, or service them.

• Use jack stands to support the machine and/or its components when required.

• Carefully release pressure from components with stored energy.

• If your machine requires major repairs or if you desire assistance, contact your Toro Distributor.

• Use only genuine Toro replacement parts and accessories. Replacement parts and accessories made by other manufacturers could be dangerous, and such use could void the product warranty.

Use the following as points to jack up the machine:

• Front of the machine—rectangular pad, under the axle tube, inside each front tire (Figure 44).

  

  Figure 44

  1. Front jacking point

• Rear of the machine—rectangular axle tube on the rear axle.

The machine has grease fittings that you must lubricate regularly with No. 2 lithium grease. Also, lubricate the machine immediately after every washing.

The grease fitting locations and quantities are as follows:

• Pump driveshaft U-joint (3) (Figure 45)

  

  Figure 45

• Cutting unit lift arm cylinders (2 each) (Figure 46)

  

  Figure 46

• Lift arm pivots (1 each) (Figure 46)

• Cutting unit carrier frame pivot (1 each) (Figure 47)

  

  Figure 47

• Lift arm pivot shaft (1 each) (Figure 48)

  

  Figure 48

• Rear axle tie rod (2) (Figure 49)

  

  Figure 49

• Axle steering pivot (1) (Figure 50)

  

  Figure 50

• Steering cylinder ball joints (2) and rear axle (1) (Figure 51)

  

  Figure 51

• Brake pedal (1) (Figure 52)

  

  Figure 52

• Cutting unit spindle shaft bearings (2 per cutting unit) (Figure 53)

  Note: You can use either fitting, which ever is more accessible. Pump grease into the fitting until a small amount appears at bottom of the spindle housing (under the deck).

  

  Figure 53

• Rear roller bearings (2 per cutting unit) (Figure 54)

  

  Figure 54

  Note: Make sure that the grease groove in each roller mount aligns with the grease hole in each end of the roller shaft. To help align the groove and hole, there is also an alignment mark on 1 end of the roller shaft.

Check the whole intake system for leaks, damage, or loose hose clamps. Do not use a damaged air filter.

Service the air-cleaner filter only when the service indicator requires it. Changing the air filter before it is necessary only increases the chance of dirt entering the engine when you remove the filter.

Important: Make sure that the cover is seated correctly and seals with the air-cleaner body.

Figure 55

• If advisory message displays in the InfoCenter, the DPF is nearing the recommended point for servicing the diesel-oxidation catalyst and the soot filter.

  

  Figure 58

• If engine faults , , or in the InfoCenter (Figure 59) display in the InfoCenter, clean the soot filter using the steps that follow:

  

  Figure 59

  1. Refer to the Engine section in the Service Manual for information on disassembling and assembling the diesel-oxidation catalyst and the soot filter of the DPF.

  2. Refer to your Authorized Toro Distributor for diesel-oxidation catalyst and the soot filter replacement parts or service.

  3. Contact your Authorized Toro Distributor to have them reset the engine ECU after you install a clean DPF.

The fuel filter should be replaced after every 400 hours of operation.

1. Clean the area around the fuel-filter head (Figure 60).

   

   Figure 60

   1. Fuel-filter head
   2. Fuel filter

2. Remove the filter and clean the filter head mounting surface (Figure 60).

3. Lubricate the filter gasket with clean lubricating engine oil. Refer to the Engine Operator's Manual for additional information.

4. Install the dry filter canister, by hand, until the gasket contacts the filter head, then rotate it an additional 1/2 turn.

5. Start the engine and check for fuel leaks around the filter head.

The fuel-pickup tube, located inside the fuel tank, is equipped with a screen to help prevent debris from entering the fuel system. Remove the fuel-pickup tube and clean screen as required.

There are 8 fuses in the Electrical System. The fuse block (Figure 62) is located behind the control-arm-access panel.

Figure 62

1. Fuse block

Figure 63

Important: Before welding on the machine, disconnect the negative cable from the battery to prevent damage to the electrical system. Also, you must disconnect the engine, InfoCenter, and machine controllers before welding on the machine.

Note: Check the battery condition weekly or after every 50 hours of operation. Keep the terminals and the entire battery case clean, because a dirty battery discharges slowly. To clean the battery, wash the entire case with a solution of baking soda and water. Rinse with clear water. Coat the battery posts and cable connectors with Grafo 112X (skin-over) grease (Toro Part No. 505-47) or petroleum jelly to prevent corrosion.

Important: Keep the battery fully charged. This is especially important to prevent battery damage when the temperature is below 0°C (32°F).

1. Clean the exterior of the battery case and the battery posts.

   Note: Connect the leads of the battery charger to battery posts before connecting the charger to the electrical source.

2. Look at the battery and identify the positive and negative battery posts.

3. Connect the positive lead of the battery charger to the positive battery post (Figure 64).

   

   Figure 64

   1. Positive battery post
   2. Negative battery post
   3. Red (+) charger lead
   4. Black (-) charger lead

4. Connect the negative lead of the battery charger to the negative-battery post (Figure 64).

5. Connect the battery charger to the electrical source, and charge the battery.

   Important: Do not overcharge the battery.

6. When the battery is fully charged, unplug the charger from the electrical source, then disconnect the charger leads from the battery posts (Figure 64).

The machine must not creep when the traction pedal is released. If it does creep, adjust as follows:

1. Park the machine on a level surface, turn the key in the ignition switch to the OFF position, and lower the cutting decks to the floor.

2. Jack up the machine until all the tires are off the shop floor. Support the machine with jack stands to prevent it from falling accidentally.

3. On the right side of the hydrostat, loosen the locknut on the traction-adjustment cam (Figure 65).

   

   Figure 65

   1. Locknut
   2. Traction-adjustment cam

   Warning

   The engine must be running so that the final adjustment of the traction-adjustment cam can be performed. This could cause personal injury.

   Keep your hands, feet, face, and other body parts away from the muffler, other hot parts of the engine, and any rotating parts.

4. Turn the key in the ignition switch to the ON position, start the engine, and rotate the cam hex in either direction until the wheels cease rotation.

5. Tighten the locknut to secure the adjustment.

6. Turn the key in the ignition switch to the OFF position, remove the jack stands, and lower the machine to the shop floor.

7. Test drive the machine to make sure that it does not creep.

1. Rotate the steering wheel so that the rear wheels are straight ahead.

2. Loosen the jam nut on each end of the tie rod (Figure 66).

   Note: The end of the tie rod with the external groove is a left-hand thread.

   

   Figure 66

   1. Wrench slot
   2. Tie rod
   3. Jam nut

3. Using the wrench slot, rotate the tie rod.

4. Measure the distance at the front and rear of the rear wheels at axle height.

   Note: The distance at the front of the rear wheels should be less than 6 mm (1/4 inch) of the distance measured at the rear of the wheels.

5. Repeat procedure as required.

The cooling system is filled with a 50/50 solution of water and permanent ethylene glycol antifreeze. The capacity of the cooling system is 9.5 L (10 US qt).

1. Check the level of coolant in the expansion tank (Figure 67).

   Note: The coolant level should be between the marks on the side of the tank.

   

   Figure 67

   1. Expansion tank

2. If the coolant level is low, remove the expansion-tank cap and replenish the system. Do not overfill.

3. Install the expansion-tank cap.

Remove debris from the screen and radiator/oil cooler daily (clean more frequently in dirty conditions).

1. Turn the key in the ignition switch to the OFF position and remove the key.

2. Thoroughly clean all debris out of the engine area.

3. Unlatch the clamp and pivot open the rear screen (Figure 68).

   

   Figure 68

   1. Rear screen latch
   2. Rear screen

4. Thoroughly clean both sides of the radiator and oil cooler (Figure 69) with compressed air.

   

   Figure 69

   1. Radiator/oil cooler

5. Close the screen and secure the latch.

Adjust the brakes when there is more than 2.5 cm (1 inch) of free travel (Figure 70) of the brake pedal, or when more holding force is required. Free travel is the distance the brake pedal moves before you feel braking resistance.

Figure 70

1. Free travel

Note: Use the wheel motor backlash to rock the drums back and forth to ensure that the drums are free prior to and after adjustment.

1. To reduce free travel of the brake pedals, tighten the brakes by loosening the front nut on the threaded end of the brake cable (Figure 71).

   

   Figure 71

   1. Brake cables
   2. Front nuts

2. Tighten the rear nut to move the cable backward until brake pedals have 0.63 to 1.27 cm (1/4 to 1/2 inch) of free travel (Figure 70), before wheel lock up is achieved.

3. Tighten the front nuts, ensuring that both cables actuate the brakes simultaneously. Ensure that the cable conduit does not rotate during tightening procedure.

If the parking brake fails to engage and latch, an adjustment to the brake pawl is required.

1. Loosen the 2 screws securing the parking brake-pawl to the frame (Figure 72).

   

   Figure 72

   1. Brake cables
   2. Brake detent
   3. Parking-brake pawl
   4. Screws (2)

2. Press the parking-brake pedal forward until the brake detent completely engages on the brake pawl (Figure 72).

3. Tighten the 2 screws locking the adjustment.

4. Press the brake pedal to release the parking brake.

5. Check the adjustment and adjust as required.

1. Proper tension allows 10 mm (3/8 inch) deflection when a force of 4.5 kg (10 lb) is applied on the belt midway between the pulleys.

2. If the deflection is not 10 mm (3/8 inch), loosen the alternator mounting bolts (Figure 73). Increase or decrease the alternator belt tension and tighten the bolts. Check the deflection of the belt again to ensure that the tension is correct.

   

   Figure 73

   1. Mounting bolt
   2. Alternator

The hydraulic tank of the machine is filled at the factory with approximately 37.8 L (10 US gallons) of high quality hydraulic fluid. Check the level of the hydraulic fluid before the engine is first started and daily thereafter. The recommended replacement fluid is as follows:

Alternate fluids: If the Toro fluid is not available, other fluids may be used provided they meet all the following material properties and industry specifications. We do not recommend the use of synthetic fluid. Consult with your lubricant distributor to identify a satisfactory product.

Note: Toro will not assume responsibility for damage caused by improper substitutions, so use only products from reputable manufacturers who will stand behind their recommendation.

High Viscosity Index/Low Pour Point Anti-wear Hydraulic Fluid, ISO VG 46

Important: The ISO VG 46 Multigrade fluid has been found to offer optimal performance in a wide-range of temperature conditions. For operation in consistently high ambient temperatures, 18°C (65°F) to 49°C (120°F), ISO VG 68 hydraulic fluid may offer improved performance.

Premium Biodegradable Hydraulic Fluid-Mobil EAL EnviroSyn 46H

Important: Mobil EAL EnviroSyn 46H is the only synthetic biodegradable fluid approved by Toro. This fluid is compatible with the elastomers used in Toro hydraulic systems and is suitable for a wide-range of temperature conditions. This fluid is compatible with conventional mineral oils, but for maximum biodegradability and performance the hydraulic system should be thoroughly flushed of conventional fluid. The oil is available in 19 L (5 US gallons) containers or 55 gallon drums from your Mobil Distributor.

Note: Many hydraulic fluids are almost colorless, making it difficult to spot leaks. A red dye additive for the hydraulic system oil is available in 20 ml (2/3 oz) bottles. 1 bottle is sufficient for 15 to 22 L (4 to 6 US gallons) of hydraulic oil. Order Part Number 44-2500 from your Toro Distributor.

1. Position the machine on a level surface, lower the cutting decks, and turn the key in the ignition switch to the OFF position.

2. Check the hydraulic-fluid level (Figure 74).

   

   Figure 74

If the fluid becomes contaminated, contact your local Toro distributor because the system must be flushed. Contaminated fluid looks milky or black when compared to clean fluid.

1. Shut off the engine and raise the hood to allow the engine and hydraulic fluid to cool.

2. Place a large drain pan under the fitting secured to the bottom of the hydraulic-fluid reservoir (Figure 75).

   

   Figure 75

   1. Hose

3. Disconnect the hose from the bottom of the fitting and let the hydraulic fluid flow into the drain pan.

4. Install the hose when hydraulic fluid stops draining.

5. Fill the reservoir with approximately 45 L (12 US gallons) of hydraulic fluid; refer to Checking the Hydraulic-Fluid Level.

   Important: Use only hydraulic fluids specified. Other fluids could cause system damage.

6. Install the reservoir cap.

7. Start the engine and use all the hydraulic controls to distribute hydraulic fluid throughout the system. Also check for leaks.

8. Shut off the engine.

9. Check the level of the hydraulic fluid and add enough to raise level to the Full mark on the dipstick.

   Important: Do not overfill.

The hydraulic system is equipped with a service interval indicator (Figure 76). With the engine running, view the indicator, it should be in the green zone. When the indicator is in the red zone, change the hydraulic filters.

Figure 76

1. Hydraulic-filter restriction indicator

Important: Use of any other filters may void the warranty on some components.

1. Position the machine on a level surface, lower the cutting decks, turn the key in the ignition switch to the OFF position, engage the parking brake, and remove the key.

2. Replace both of the hydraulic filters (Figure 77).

   

   Figure 77

3. Turn the key in the ignition switch to the ON position, start the engine, and let it run for about 2 minutes to purge air from the system.

4. Turn the key in the ignition switch to the OFF position and check for leaks.

Daily, check hydraulic lines and hoses for leaks, kinked lines, loose mounting supports, wear, loose fittings, weather deterioration, and chemical deterioration. Make all necessary repairs before operating.

The test ports are used to test the pressure in the hydraulic circuits. Contact your Toro Distributor for assistance.

Use the list below to identify and describe the different functions of the solenoids in the hydraulic manifold. Each solenoid must be energized to allow function to occur.

1. Position the machine on a level surface, lower the cutting decks to the floor, turn the key in the ignition switch to the OFF position, and engage the parking brake.

2. Disconnect and remove the hydraulic motor from the deck (Figure 78). Cover the top of the spindle to prevent contamination.

   

   Figure 78

   1. Motor-mounting screws

3. Remove the lynch pin securing the deck carrier frame to the lift arm pivot pin (Figure 79).

   

   Figure 79

   1. Lynch pin
   2. Lift-arm pivot pin

4. Roll the cutting deck away from the traction unit.

1. Position the machine on a level surface and turn the key in the ignition switch to the OFF position.

2. Move the cutting deck into position in front of the traction unit.

3. Slide the deck carrier frame onto the lift-arm pivot pin and secure it with the lynch pin (Figure 79).

4. Install the hydraulic motor to the deck (Figure 78). Make sure that the O-ring is in position and not damaged.

5. Grease the spindle.

Inspect the front roller for wear, excess wobble, or binding. Service or replace the roller or components if any of these conditions exist.