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Maintenance
Purging the Air from the Hydraulic
System
Due to the effects air has on efficiency in hydraulic
drive systems, it is critical that it be purged from
the system. These purge procedures should be
implemented any time a hydraulic system has been
opened to facilitate maintenance or any additional oil
has been added to the system.
The resulting symptoms of air in the hydraulic system
may be:
• Noisy operation.
• Lack of power or drive after short term operation.
• High operation temperature and excessive
expansion of oil.
Before starting, make sure the transaxles/
transmissions are at the proper oil levels. If it is not,
fill to the specifications outlined in the Check / Fill
Transmission Oil Level procedure.
Purging Air from the Hydraulic System:
1. Chock the front wheels to prevent the machine
from rolling. Raise the rear of the machine so that
the vehicle’s rear tires do not contact the ground.
Position jack stands under the rear bumper of the
machine to secure it.
2. Open the transaxle’s bypass valves (see Pushing
the Rider by Hand for the location and function
of the bypass valves), start the engine, release
the parking brake, and slowly move the zero-turn
rider’s ground speed control levers in both forward
and reverse directions (5 to 6 times), as air is
purged from the unit, the oil level will drop.
3. Stop the engine and engage the parking brake.
4. Close the transaxle’s bypass valves, start the
engine, release the parking brake, and slowly move
the zero-turn rider’s ground speed control levers in
both forward and reverse directions (5 to 6 times),
as air is purged from the unit, the oil level will drop.
5. Stop the engine. Remove the jack stands from
underneath the machine.
6. Repeat the process detailed above but with the
unit’s drive wheels on the ground. The procedure
should be performed in an area free of any objects
or bystanders.
It may be necessary to repeat the process detailed
above until all the air is completely purged from the
system. When the transaxles/transmissions operate
at normal noise levels and move smoothly forward
and reverse at normal speeds, then the transaxles/
transmissions are considered purged.
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