Exmark Turf Tracer Operator's Manual page 36

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.
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 counter-clockwise 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 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" (2.5 cm) between washers. Adjust spring length
by turning nut at front of spring.
d) Drive Lever Linkage Adjustment
1. With rear of machine still on jack stands and engine running at full
throttle, 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. See Figure 4. If the tire rotates in either
direction, the length of the drive lever linkage will need to be adjusted.
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 checking that the tire stops. Continue
this process until the tire is at a dead stop.
3. Make this adjustment for both sides.
e) Tracking Adjustment
1. Stop engine and wait for all moving parts to stop. Raise rear of machine,
remove jack stands, and carefully lower machine to the ground.
2. Check the drive tire pressures and tire circumferences. See 5.1.12.
3. Run the unit and observe the tracking on a level, smooth, hard
surface such as concrete or asphalt.
4. If the unit tracks to one side or the other, turn the quick track knob.
Turn the knob right to "steer" right, turn the knob left to "steer" left.
5.2.6 Hydro Pump Spring Tension Setting
a) For medium or heavy duty drive conditions such as operation with a sulky
on steep slopes, a higher spring force may be required on the hydro
pump control arms to prevent the drive system from stalling.
b) For a heavier drive setting, relocate the spring anchor link as shown in
Figure 12. The spring anchor links are located under the engine deck on
the left and right hand sides.
Note: In "medium" or "heavy duty" positions, the drive lever forces at the
upper handle will also be increased.
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