121363 4-7 REV C
Air creates inefficiency because its compression and
expansion rate is higher than that of the oil approved for use
in hydrostatic drive systems.
These purge procedures should be implemented any time a
hydrostatic system has been opened to facilitate mainte-
nance or the oil has been changed.
The resulting symptoms in hydrostatic systems may be:
1. Noisy operation.
2. Lack of power or drive after short term operation.
3. High operation temperature and excessive expansion
of oil.
Before starting, make sure the transaxle is at the proper oil
level. If it is not, fill to the specifications outlined in this man-
ual.
The following procedures are best performed first with the
vehicle drive wheels off the ground and then repeated under
normal operating conditions. If this is not possible, then the
procedure should be performed in an open area free of any
objects or bystanders.
1. Raise the rear of the mower and block with certified
jack stands. The rear wheels need to be able to rotate
freely and clear of all obstructions.
2. Chock the front tires.
3. Unbolt the seat platform from the mower frame.
• Disconnect the mower harness from the seat
switch.
• Bypass the seat switch by connecting the two
mower harness female spades together.
Figure 4-14
• Re-attach the seat platform to the mower frame.
4. Start the engine.
A. Top port plug
Figure 4-13
Exercise extreme caution when the transmissions
are engaged.
• Keep hands, hair, clothing, etc., clear of the
cooling fans on top of the transmissions to
prevent entanglement.
Never work under the machine or attachment
unless it is safely supported with jack stands.
• Make certain machine is secure when it is
raised and placed on the jack stands.
• Use only certified jack stands. Use only
appropriate jack stands, with a minimum
weight rating of 2000 pounds (907 kg) to
block the unit up.
• Use in pairs only.
• Follow the instructions supplied with the
jack stands.
• The jack stands should not allow the
machine to move when the engine is running
and the drive wheels are rotating.
• Do not allow the wheels to come in contact
with the floor or any object that would permit
the unit to propel itself.
• To prevent injury stay clear and exercise cau-
tion when rotating the wheels.
Untrained maintenance personnel should never
attempt to make any adjustments or repairs to the
mower’s drive system while the engine is running.
The following procedures should be performed by
trained maintenance personnel only.
A. Seat switch
B. Female spades
C. Mower harness
Figure 4-14
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