Checking and Adjusting Motion Control Linkages

CAUTION: Engine exhaust fumes contain carbon monoxide and can cause serious illness or death.

• Move the machine to an outside area before running the engine.
• Do not run an engine in an enclosed area without adequate ventilation.
• Connect a pipe extension to the engine exhaust pipe to direct the exhaust fumes out of the area.
• Allow fresh outside air into the work area to clear the exhaust fumes out.

NOTE: Check and adjust motion control linkages with the machine parked on a hard, level surface.

CAUTION: The machine can fall or slip from an unsafe lifting device or supports.

• Use a safe lifting device rated for the load to be lifted.
• Lower machine onto jack stands or other stable supports and block wheels before servicing.

Checking Neutral Position

Neutral refers to mower movement when the engine is at full throttle, park brake is off, and the control levers are in the neutral position. The mower should not move forward or backward during this time. If the mower is moving forward or backward, the neutral setting must be adjusted.

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1. Raise rear of machine with safe lifting device:

   • Use wheel chocks to block the front wheels.
   • Support with wood blocks or jack stands.
   • Rear drive wheels must be able to rotate freely.
   
   

2. Start engine.

3. Move throttle lever to the fast position.

4. Unlock park brake.

5. If the rear drive wheels begin to creep, an adjustment is required.

Adjusting Neutral Position

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1. Remove retaining knob (A), and remove belt access panel (B).

2. Raise thigh pad.

3. 
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   Raise rear of machine with safe lifting device:
   • Use wheel chocks to block the front wheels.
   • Support with jack stands.
   • Rear drive wheels must be able to rotate freely.
   
   

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4. Start engine.

5. Move throttle lever to the fast position.

6. Unlock park brake.

7. NOTE: If the right wheel turns in the neutral position, then the right pump requires adjustment.

   Do not over-tighten the return-to-neutral device screw.

   
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   Loosen the 1/4-inch screw (A) and rotate the return-to-neutral device on the pump corresponding to the wheel requiring adjustment. Rotate the return-to-neutral device until the neutral position is located. Tighten the screw.

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8. Repeat step 7, as needed, for the other pump.

Changing the Speed Sensitivity Adjustment

The control system torsion bar has two sets of holes where he control linkage can be installed. The holes farthest from the operator position are for slower, less sensitive setting, and the holes closest to the operator position are the faster, more sensitive setting.

The controls are initially set with the speed/sensitivity adjustment in the faster, more sensitive position. If an operator is not completely familiar with the mower operation, the operator may desire to decrease the ground speed.

The slower setting has a corresponding decrease in the sensitivity of the controls. In other words, a given amount of movement of the control levers will cause about a 25-30% change in the ground speed, making the controls less sensitive.

1. Park machine safely. (See Parking Safely in the Safety section.)

2. Stop engine.

3. Lock park brake.

4. Raise thigh pad.

5. 
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   Remove lock nut (A) and disconnect control linkage rod end (B) from the control system torsion bar (C).

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6. 
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   Install the rod end (B) into the alternate hole (D).

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7. Repeat steps 5 and 6 for the other control linkage rod.

8. Perform “Checking and Adjusting Transmission Tracking.”