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45
5. Engage the parking brake. The neutral lockout bolts will
enter the notches of the neutral lockout plates (C).
6. Position the neutral lockout bolts to the center of the
notches of the neutral lockout plates.
7. Re-tighten the jam nuts.
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 Uncrating 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
20
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.
Suspension Adjustment
The shock assemblies (A, Figure 46) can be adjusted in two
ways to allow the operator to customize the ride according to
the operator's weight and/or operating conditions. You have
the option of adjusting the spring pre-load and/or the upper
mounting position.
46
Items to consider before adjusting the suspension:
ferrismowers.com
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