Exmark 4500-528 manual Tracking Adjustment, Drive Lever Linkage Adjustment, Maintenance

Maintenance

Note: The neutral lock latches should be “unlocked” and in the forward position.

2.Loosen the front nut on left hydro control linkage as shown in Figure 16. Turn the rear control linkage adjusting nut counterclockwise until wheel rotates forward. Turn the rear nut of left control linkage clockwise 1/4 of a turn at a time, stopping to move the speed control forward and back to neutral, until left wheel stops rotating forward.

Turn the rear nut an additional 1/2 turn and tighten the front nut making sure not to put a bind on the linkage. Make sure flat part of linkage is perpendicular to pin part of swivel (see Figure 17).

to neutral. Recheck the drive wheel rotation to see if further adjustment is necessary.

4.The spring that keeps tension on the knob should normally not need adjustment. However, if adjustment is needed, adjust to where length of spring is about 1 inch (2.5 cm) between the washers. Adjust spring length by turning nut at front of spring.

•Drive Lever Linkage Adjustment:

1.With rear of machine still on jack stands and engine running at full throttle, disengage the park brake and move the speed control lever to the midway position. Move the respective drive lever upward until it reaches the neutral position and engage neutral lock latches (Figure 18). If the tire rotates in either direction, the length of the drive lever link will need to be adjusted.

Figure 17

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 18

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.

Tracking Adjustment

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

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