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LUBRICATION
English-54
Purging Procedures
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 2.
operation.
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 1.
capacity beneath the oil lter. Remove the
oil lter from the pump.
After the oil has drained, wipe the lter 2.
base 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
3.
full turn after the lter gasket contacts the
lter base surface.
Drain old oil lters of all free-owing 4.
oil prior to 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 5.
expansion tank located on the vehicle
frame.
Fill reservoir with SAE 10W30 oil to just 6.
above the MIN-ADD line on the reservoir.
After purging, check levels and add oil if
necessary.
Reinstall the expansion tank cap by hand. 7.
Do not overtighten.
Proceed to the purge procedure.8.
8061-016
1. Pump lter
2. Pump reservoir
3. Fluid ll lines
Changing the hydraulic pump oil lter
1
2
3
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 2.
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.
With the bypass valve closed and the 3.
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.
It may be necessary to repeat Steps 2 and 4.
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, the
transaxle is considered purged.
After the vehicle has been used two times, 5.
the oil level should be checked while the oil
is cold and adjusted accordingly.