Exmark 4500-358 Linkage as shown in . Turn the rear, Between the washers. Adjust spring length by

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 16. 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
	• Drive Lever Linkage Adjustment:
of left control linkage clockwise 1/4 of a turn
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 18). If the tire rotates in either
(see Figure 17).	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				Figure 18
	position and then back to the neutral position.
	Recheck the left drive wheel rotation to see if
	further adjustment is necessary - be sure the				2. Adjust the linkage length by loosening the jam
	speed control lever is in the neutral position.				nuts at both ends of the linkage and rotating
	Note: If inconsistent neutral occurs,				the linkage in the ball joints. Lengthen the
					linkage if the tire is turning in reverse and
	check to be sure both springs are properly
					shorten the linkage if the tire is creeping
	tightened on the speed control lever under the
					forward. Tighten the jam nuts at both ends.
	console–especially the rear pivot spring.
					Release and re-engage the neutral lock latch
	Repeat above adjustments if necessary.				checking that the tire stops. Continue this
	3. Place the speed control lever in neutral. Adjust				process until the tire is at a dead stop.
					3. Make this adjustment for both sides.
	the right side linkage by turning the quick track
	knob counterclockwise until the tire begins to			•	Tracking Adjustment:
	rotate forward. Begin to retighten the knob
					1. Stop engine and wait for all moving parts to
	clockwise about 1/4 turn at a time, stopping
	to move the speed control forward and back				stop. Engage parking brake. Raise the rear of

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