Exmark Viking Hydro Operator's Manual page 39

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
levers are in the neutral position, tighten the nuts against the yokes.
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
19. 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 20.
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.
FIGURE 20
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