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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 

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.