Service manual

REV C 4-2 115615
8. If wheel(s) are rotating in reverse then loosen the jam
nuts on the pump linkage rods and rotate the rod to
shorten the steering control linkage until the wheel(s)
come to a stop. Figure 4-3
Repeat for the opposite side if necessary
9. When both wheels remain in neutral, tighten the jam nuts
to lock the turnbuckle in place.
10. Test again by moving the steering control levers forward
and backward before returning them to the neutral
position. If the tires are in neutral, the unit is now ready
for operation.
11. After adjusting for neutral it may be necessary to re-
adjust the control lever stop and/or damper.
12. IMPORTANT: With the engine off, disconnect the two
female spade connectors from each other (from step #3)
and reconnect them to the seat switch. This must be
completed so that the safety circuit is functioning
properly. Figure 4-1
13. Check to make sure all tools or obstructions are removed
from under the mower.
14. Raise the rear of the mower and remove the jack stands.
Lower the mower.
15. Lower and secure the seat platform.
Control lever stops
The steering control lever stops (see Figure 4-4) are designed
to keep the pumps from bottoming out internally.
To keep the pumps from bottoming out internally use
the following procedure:
This adjustment is only required if the hydraulic pump(s) or
pump linkage rod(s) have been replaced.
1. To make the first adjustment the mower engine must not
be running.
2. Check to make sure the pump stop screws are against the
stops before the pumps are bottomed out internally.
3. To do this, gently and slowly move the steering control
levers forward and feel if there is some resistance on the
pump lever before the pump stop screws hit the stops.
Check one side at a time. If you sense that the pump arms
are stopping the forward motion of the control arms, turn
the pump stop screw, of the corresponding side, inward to
stop the steering control levers slightly before the pump
bottoms out. Do this for each side.
To adjust the stops for driving straight when steering
control levers are against the stops during operation:
1. Determine which drive tire is rotating too fast when both
steering control levers are against the drive straight stops
in the control panel (see Figure 4-5).
2. Then, stop the mower and loosen the lock nut on the side
which is rotating too fast and turn the stop (set screw)
inward to stop the steering control lever sooner. Tighten
the lock nut on the stop and test again.
3. Repeat this procedure until unit drives straight.
NOTE: Since this is a hydrostatic drive, variables such as
temperature of oil, efficiency of pumps and motors, tire pressure
etc. may effect the consistency of the ability to rely on the stops
to drive straight without the operator making minor steering
adjustments with the control arms.
Figure 4-3
WARNING
Do not operate the mower without plugging the mower’s
wiring harness into the seat switch. This switch is an
important part of the safety start interlock system. Serious
injury can result if the seat switch is not plugged into the
mower’s wiring harness.
WARNING
Never operate the mower with a non-functioning seat
switch. Always reconnect the seat switch to the mower
harness.
Jam nut
Pump linkage rod
WARNING
Pump damage will occur if these stops are set incor-
rectly.
Figure 4-4
Pump stop
screw
Steering
damper