Exmark Turf Tracer Operator's Manual page 33

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Note: The OPC levers must be held down whenever the speed
control lever is out of the neutral position or the engine will kill.
3. Squeeze the respective drive lever until an increased resistance is
felt; this is where neutral should be. Make sure you have not reached
the end of the neutral lock latch slot. If you have, shorten the drive
lever linkage. If the wheel turns while holding the drive lever in
neutral, the neutral control linkages need to be adjusted. If wheels
stop then go to step 7.
HYDRO DRIVE LINKAGE ADJUSTMENT
4. Loosen the nut against the yoke as shown in Figure 9.
5. Adjust the neutral control linkage until the respective drive wheel
stops when the lever is pulled against the neutral spring (neutral
position). Turn the adjusting bolt approximately 1/4 turn clockwise if
the wheel is turning in reverse or turn the bolt approximately 1/4 turn
counter-clockwise if the wheel is turning forward. Release the drive
lever to the forward drive position and squeeze back into the neutral
position. Check to see if the wheel stops. If not, repeat the above
adjustment procedure.
6. Make this adjustment on both sides.
7. After adjustments are made and the wheels stop when the drive lever
is in the neutral position, tighten the nut against the yoke.
c) Adjust Hydro Control Linkage:
1. Place the speed control lever in the "neutral" position. This adjustment
is again made with rear of machine on jack stands and engine
running at full throttle. OPC levers will have to be held down
whenever speed control lever is moved out of neutral position.
2. Loosen the front nut on left hydro control link as shown in Figure 9.
Turn the rear control linkage adjusting nut counter-clockwise until
wheel rotates forward. Turn the rear nut of left control link 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
nut an additional 1/2 turn and tighten the front jam 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 Fig. 10.
HYDRO CONTROL LINKAGE/SWIVEL ADJUSTMENT
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ADJUST HERE - ROTATE
AT APPROXIMATELY 1/4
TURN INCREMENTS
FIG. 9
FIG. 10
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