Service Manual

Mid-Size Walk Behind Service Manual 5 - 13
HYDRAULIC DRIVE SYSTEMS
2. Place the speed control lever in the neutral
position.
3. Place the left drive lever in the full forward
position.
4. Hold OPC levers down.
Note: The OPC levers must be held down whenever
the speed control lever is out of the neutral position or
the engine will kill.
5. Loosen the front nut on left hydro control linkage
as shown in Figure 89.
Figure 89
0610-17
6. Turn the left rear adjusting nut counterclockwise
until wheel rotates forward (Figure 89).
7. Turn the rear adjusting nut clockwise 1/4 of a turn
at a time. Then move the speed control lever
forward and back to neutral. Repeat this until left
wheel stops rotating forward (Figure 89).
8. Turn the rear nut an additional 1/2 turn and tighten
the front nut.
Note: Make sure flat part of linkage is perpendicular to
pin part of swivel.
9. After adjusting the left hydro control linkage, move
the speed control lever forward and then back to
the neutral position.
10. Make sure the speed control lever is in the neutral
position and the tire does not rotate.
11. Repeat adjustment if needed.
Note: 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 so the speed control lever is held firmly in
place and does not slide, but not too tight where the
speed control lever binds. Repeat above adjustments
if necessary (Figure 90).
Figure 90
0602-28
Right Side Linkage Adjustment
1. Place the speed control lever in the neutral
position.
2. Place the right drive lever in the full forward
position.
WARNING
Electrical system will not perform proper safety
shut off with Operator Presence Control (OPC)
levers held in place.
• Make sure Operator Presence Control (OPC)
levers are working when adjustment is
completed.
• Never operate this unit with Operator Presence
Control (OPC) levers held in place.
(A) Hydro control linkage
(B) Front nut
(C) Rear adjusting nut
A
B
C
(A) Rear pivot spring (B) Spring
A
B