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Purging Procedures
Due to the effects air has on efficiency in hydrostatic
drive applications, it is critical that it is purged from the
system.
These purge procedures should be implemented any
time a hydrostatic system has been opened to facilitate
maintenance or any additional oil has been added to
the system.
The resulting symptoms in hydrostatic systems may
be:
1. Noisy operation.
2. Lack of power or drive after short term
operation.
3. High operation temperature and excessive
expansion of oil.
Before starting, make sure the transaxle is at the
proper oil level. If it is not, fill to the specifications
outlined earlier.
The following procedures are best performed with the
vehicle drive wheels off the ground. Then repeated
under normal operating conditions.
1. Disengage the brake if activated.
2. With the bypass valve open and the engine
running at fast idle, slowly move the
directional control in both forward and
reverse directions (5 or 6 times). As air is
purged from the unit, the oil level will drop.
3. With the bypass valve closed and the
engine running, slowly move the directional
control in both forward and reverse
directions (5 to 6 times). Check the oil
level, and add oil as required after stopping
the engine.
4. It may be necessary to repeat Steps 2 and
3 until all the air is completely purged from
the system. When the transaxle operates
at normal noise levels and moves smoothly
forward and reverse at tnormal speeds,
then the transaxle is considered purged.
5. After the vehicle has been used two times,
the oil level should be checked while the oil
is cold and adjusted accordingly.
LUBRICATION