Exmark 4500-540 Rev. B manual Drive Lever Linkage Adjustment

Models: 4500-540 Rev. B

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Maintenance

disengaged whenever speed control levers are

to neutral. Recheck the drive wheel rotation

moved out of the neutral position.

to see if further adjustment is necessary.

Note: The neutral lock latches should be

4. The spring that keeps tension on the knob

“unlocked” and in the forward position.

should normally not need adjustment.

2. Loosen the front nut on left hydro control

However, if adjustment is needed, adjust to

where length of spring is about 1 inch (2.5 cm)

linkage as shown in Figure 17. Turn the rear

between the washers. Adjust spring length by

control linkage adjusting nut counterclockwise

turning nut at front of spring.

until wheel rotates forward. Turn the rear nut

of left control linkage clockwise 1/4 of a turn

Drive Lever Linkage Adjustment:

at a time, stopping to move the speed control

1. With rear of machine still on jack stands and

forward and back to neutral, until left wheel

engine running at full throttle, disengage

stops rotating forward.

the park brake and move the speed control

Turn the rear nut an additional 1/2 turn and

lever to the midway position. Move the

tighten the front nut making sure not to put

respective drive lever upward until it reaches

a bind on the linkage. Make sure flat part of

the neutral position and engage neutral lock

linkage is perpendicular to pin part of swivel

latches (Figure 19). If the tire rotates in either

(see Figure 18).

direction, the length of the drive lever link will

 

 

 

 

 

 

 

 

need to be adjusted.

 

 

 

 

 

 

 

 

 

Figure 18

1.

Left Hydro Control Link

4.

Linkage is perpendicular

 

(left side shown)

 

to pin (correct position)

2.

Front nut

5.

Linkage in incorrect

3.

Rear nut

 

position

6.

End view of swivel

After adjusting the left hydro control linkage, move the speed control lever to the mid-speed position and then back to the neutral position. Recheck the left drive wheel rotation to see if further adjustment is necessary - be sure the speed control lever is in the neutral position.

Important: If inconsistent neutral occurs, check to be sure both springs are properly tightened on the speed control lever under the console–especially the rear pivot spring.

Repeat above adjustments if necessary.

3.Place the speed control lever in neutral. Adjust the right side linkage by turning the quick track knob counterclockwise until the tire begins to rotate forward. Begin to retighten the knob clockwise about 1/4 turn at a time, stopping to move the speed control forward and back

Figure 19

2.Adjust the linkage length by loosening the jam nuts at both ends of the linkage and rotating the linkage in the ball joints. Lengthen the linkage if the tire is turning in reverse and shorten the linkage if the tire is creeping forward. Tighten the jam nuts at both ends. Release and re-engage the neutral lock latch checking that the tire stops. Continue this process until the tire is at a dead stop.

3.Make this adjustment for both sides.

4.Stop engine and wait for all moving parts to stop. Raise rear of machine, remove jack stands, and carefully lower machine to the ground.

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Exmark 4500-540 Rev. B manual Drive Lever Linkage Adjustment