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Purging
Due to the effects air has on efciency 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:
Noisy operation.1.
Lack of power or drive after short term operation.2.
High operation temperature and excessive 3.
expansion of oil.
Hydraulic Pump
Fluid Change
This transaxle is designed with an external lter for
ease of maintenance. To ensure constant uid quality
levels and longer life an oil lter change interval of
every 200 hours is recommended.
The following procedure can be performed with the
pump installed in the vehicle, and the vehicle on level
ground. Apply the bypass valve and lock the vehicle
parking brake.
Place an oil drain pan with a two gallon capacity 1.
beneath the oil lter. Remove the oil lter from the
pump.
After the oil has drained, wipe the lter base 2.
surface off and apply a lm of new oil to the
gasket of the new replacement lter.
Install the new lter by hand, turn ¾ to one full 3.
turn after the lter gasket contacts the lter base
surface.
Drain old oil lters of all free-owing oil prior to 4.
disposal. Place used oil in appropriate containers
and dispose of it in accordance with laws in your
area.
Remove the cap from the pump’s expansion tank 5.
located on the vehicle frame.
Fill reservoir with SAE 10W30 oil to just above 6.
the MIN-ADD line on the reservoir. After purging,
check levels and add oil if necessary.
Reinstall the tank cap by hand. Do not 7.
overtighten.
Proceed to the purge procedure.8.
8061-016
Pump lter1.
Pump reservoir2.
Fluid ll lines3.
Changing the hydraulic pump oil filter
Before starting, make sure the pump is at the proper
oil level. If it is not, ll to the specications outlined
earlier.
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 directional
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 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.
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, then 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.