Service Manual

HYDROSTATIC DRIVE SYSTEM
7-42 2007 - 2008 Titan Z Service Manual
7
Purging Procedures - Transaxles Hydraulic System Maintenance
Checking the Hydraulic Oil Level
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drive applications, it is critical that it be purged from the
system.
These purge procedures should be implemented any
time a hydrostatic system has been opened to facilitate
maintenance or the oil has been changed.
The resulting symptoms of air in the 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.
The following procedures should be performed with
the vehicle wheels off the ground and repeated under
operating conditions.
1. With the bypass open (push position) and the
engine running, slowly move the directional controls
(forward/reverse levers) in both forward and reverse
direction 5 to 6 times; as air is purged from the
transaxles, the oil level will drop.
2. With the bypass valves in the closed position (run
position) and the engine running, slowly move the
directional control levers in both forward and reverse
directions 5 to 6 times.
3. It may be necessary to repeat steps 1 and 2 until
all air is completely purged from the transaxles.
When the transaxles move forward at normal speed,
purging is complete.
A. Engine B. Expansion tank
Service Interval: Before each use or daily
Check expansion tank and if necessary add MOBIL 1
15W-50 synthetic motor oil to the FULL COLD line (Fig.
505).
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A
B