Yazoo/Kees ZEKW42170 - Manual (Page 60)

English-
58
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 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.