Power Unit Maintenance; Steering Adjustments - BigDog Diablo MP General Service Manual

Steering Adjustments

Steering control lever neutral adjustment
The mower's steering has been factory adjusted to elimi-
nate creeping when the steering control levers are in the neu-
tral position. However, should the mower begin to creep, the
steering control lever linkage can be adjusted.
Before considering any adjustment, check the tire air pres-
sure. Unequal tire pressure will cause the mower to drift to
one side. Refer to tire pressure information in the Tires sec-
tion for detailed information.
NOTE: Proper park brake adjustment must be completed
before the steering control lever neutral adjustment can be
done. Refer to the Park Brake Spring Adjustment section for
detailed information.
Fine adjustment to the unit's steering is made with the
transmission's control rod.
Neutral is properly adjusted when the steering control
levers are in the park brake position and the transmissions
do not "whine".
If this occurs, the steering control linkage may be adjusted
as follows:
This procedure will require that the unit be raised
and blocked up off of the ground. It is necessary
for the wheels to rotate without coming in contact
with the floor or any object that would permit the
unit to propel itself. Stay clear and exercise cau-
tion when rotating wheels to prevent injury. Use
only appropriate vehicle stands, with a minimum
weight rating of 2000 pounds to block the unit up.
Use in pairs only. Follow the instructions supplied
with the vehicle stands.
Keep hands, hair, clothing, etc., clear of the cooling
fans on top of the transmissions. Exercise extreme
caution.
Untrained maintenance personnel should never
attempt to make any adjustments or repairs to the
mower's drive system while the engine is running.
The following procedures should be performed by
trained maintenance personnel only.
1. Raise the rear of the mower and block with certified
jack stands. The rear wheels need to be able to rotate
freely and clear of all obstructions.
2. Chock the front tires.
120125

POWER UNIT MAINTENANCE

A. Seat switch
B. Female spades
10. Test again by moving the steering control levers for-
11. After adjusting for neutral it may be necessary to re-
4-1
3. Raise the seat platform and disconnect the mower har-
ness from the seat switch. Bypass the seat switch by
connecting the two mower harness female spades
together. Figure 4-1
B
Figure 4-1
4. Start the engine.
5. Position the steering control lever in the neutral posi-
tion and observe which way the wheels are rotating.
Figure 4-2
6. If wheel(s) are rotating forward, loosen the jam nuts on
the pump linkage rods and rotate the rod to lengthen
the steering control linkage until the wheel(s) come to
a stop. Figure 4-3
7. Repeat for the opposite side if necessary.
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.
ward and backward before returning them to the neu-
tral position. If the tires are in neutral, the unit is now
ready for operation.
adjust the control lever stop and/or damper.
A
B
C
C. Mower harness
REV D