Exmark Viking Hydro Operator's Manual page 37

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c) Adjust Hydro Control Linkages:
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 and the park brake
must be disengaged whenever speed control levers are moved out of
the neutral position.
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
18. Turn the rear control linkage adjusting nut counter-clockwise 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 19.
HYDRO CONTROL LINK/SWIVEL ADJUSTMENT
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 the 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, 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. See
Figure 20. If the tire rotates in either direction, the length of the drive
lever link will need to be adjusted.
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FIGURE 19
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