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53

LUBRICATION

53

Due to the effects air has on efficiency in hydrostatic 
drive applications, it is critical to purge 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.
Resulting symptoms in hydrostatic systems may be:
•  Noisy operation.
•  Lack of power or drive after short term operation.
•  High operation temperature and excessive 

expansion of oil.

Before starting, make sure the oil tank is at the proper 
oil level. If not, fill to the specifications outlined in this 
section.
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 hydraulic drive operates at normal noise 
levels and moves smoothly forward and reverse at 
normal speeds, the hydraulic drive 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.