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Maintenance Checklist
Purge Procedures
Due to the effects air has on efficiency in hydrostatic drive
applications, it is critical that air is removed or purged from
the system.
NOTE: These procedures must be preformed anytime a
hydrostatic system has been opened for maintenance or
repair, or if any additional hydraulic fluid has been added
to the system.
Air creates inefficiency because it has compression and
expansion rates that are higher than that of hydraulic fluid.
Air trapped in the hydraulic fluid may cause the following
symptoms:
1. Noisy operation.
2. Lack of power or drive after short-term operation.
3. High operation temperature and excessive
expansion of hydraulic fluid.
Before starting purge procedure, make sure the reservoir
is at the proper oil level. If it is not, fill to top of tank baffle.
The following procedures should be performed with the
drive wheels off the ground, then repeated under normal
operating conditions.
1. With the bypass valve open and the engine/motor
running, slowly move the directional control in both
forward and reverse directions 5 to 6 times. As air is
purged from the unit, the hydraulic fluid level in the
reservoir will drop.
26
2. With the bypass valve closed and the engine/motor
running, slowly move the directional control in both
forward and reverse directions 5 to 6 times. Check the
oil level, and add hydraulic fluid as required after
stopping engine/motor.
3. It may be necessary to repeat steps 1 and 2 until all
the air is completely purged from the system. When
the drive wheels move forward and reverse at normal
speed, and the reservoir hydraulic fluid remains at a
constant level, purging is complete.
Front Wheel Adjustment
The front wheels can be adjusted independently.
1. Loosen, but do not remove the four nuts holding the
wheel to be adjusted.
2. Adjust wheel height as needed using height
adjustment bolt.
3. Tighten all nuts to secure wheel into position. Torque
to 23-27 ft-lbs (31.2-36.6 N•m).
3A7600C
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