Maintenance

across the terminals in the connector of the wiring harness.

3.Start the engine.

4.Run the unit at least 5 minutes with the speed control lever at full forward speed to bring hydraulic system oil up to operating temperature. Return speed control lever to neutral (full rear) position.

5.To obtain the neutral position, adjust the left and right pump control rod linkages that connect the steering control to the pump control arms until the wheels stop, or creep slightly in reverse.

6.Adjust the left pump linkage by rotating the tracking adjustment knob.

7.Adjust the right pump linkage by using a wrench to turn the double nuts on the assembly (see Figure 17)

Set forward stop bolt:

1.Remove seat deck (with seat attached) to obtain a clear view of the steering control shaft to complete this adjustment.

2.Push the speed control lever forward to full forward speed position.

3.If either steering control lever surface does not contact the stop bar at the full forward speed position, adjust the stop bolt until contact occurs (see Figure 18). Once contact occurs, turn the stop bolt one more full turn to prevent bottoming of the hydraulic pump internal stops.

Figure 18

1. Speed control Lever

2. Contact must be

forward stop bolt

maintained between

 

these components at full

 

forward speed condition

 

 

 

 

Steering Control Lever

 

 

Response Adjustment

 

 

1. Stop engine, wait for all moving parts to stop and

Figure 17

 

remove key. Engage parking brake.

 

2. Move the speed control lever to the full forward

1. Rotate tracking knob on 2.

Rotate double nuts on

position.

left side

right side

 

 

3. Lift the seat and locate the pump control springs.

8. Move the steering levers to the reverse

To increase responsiveness, increase spring

tension by hooking the rear spring anchor directly

position. While applying slight pressure to

to the anchor bolt. To decrease responsiveness,

the levers, allow the steering levers to return

hook the rear spring anchor to the anchor tab.

to neutral. The wheels must stop turning (or

 

slightly creep in reverse).

Note: Be sure both springs maintain the same

9. Stop engine and wait for all moving parts to

adjustment.

stop. Remove jumper wire from wire harness

 

connector and plug connector into seat switch.

 

10. Lower from jackstands.

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Image 32
Exmark 4500-367 manual Steering Control Lever, Response Adjustment