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LUBRICATION
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 normal 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.