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LUBRICATION
56-Husqvarna
Purging Procedures
Due to the effects air has on efciency 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.1.
Lack of power or drive after short term operation.2.
High operation temperature and excessive 3.
expansion of oil.
Shortened component life.4.
Before starting, make sure the pump is at the proper
oil level. If not, ll to the specications outlined prior.
The following procedures are best performed with the
vehicle drive wheels off the ground, then repeated
under normal operating conditions.
Disengage the brake if activated.1.
With the bypass valve open and the engine 2.
running at fast idle, slowly move the steering
control in both forward and reverse directions (5 or
6 times). As air is purged from the unit, the oil level
will drop.
With the bypass valve closed and the engine 3.
running, slowly move the steering control in both
forward and reverse directions (5 to 6 times).
Check the oil level and add oil as required after
stopping the engine.
It may be necessary to repeat Steps 2 and 3 until 4.
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, the transaxle is considered
purged.
After the vehicle has been used two times, the oil 5.
level should be checked while the oil is cold and
adjusted accordingly.
8058-020
Disengage the parking brake
WARNING!
Escaping hydraulic oil under
pressure can have sufcient force to
penetrate the skin, causing serious
injury.
If injured by escaping uid,
see a doctor at once. Serious
infection or reaction can develop
if proper medical treatment is not
administered immediately.