Owner's Manual

LUBRICATION

Transmission Purging Procedures

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.