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CAUTION
Raising the mower for service or
maintenance relying solely on mechanical
or hydraulic jacks could be dangerous. The
mechanical or hydraulic jacks may not be
enough support or may malfunction
allowing the unit to fall, which could cause
injury.
Do not rely solely on mechanical or
hydraulic jacks for support. Use adequate
jack stands or equivalent support.
7. If either drive wheel does not rotate, one or both
of the charge pumps (located on the top of the
main pump) may have lost their "prime". Refer
to Hydraulic System Purge section.
NOTE: Do not change hydraulic system oil (except
for what can be drained when changing filter),
except in the case of possible contamination or oil
has been extremely hot.
HYDRAULIC SYSTEM AIR PURGE
Service Interval: As Required
Due to the effects air has on efficiency in
hydrostatic drive applications, it is critical that air is
removed or purged from the system.
These purge procedures must be preformed
anytime a hydrostatic system has been opened for
maintenance or repair, or if any additional oil has
been added to the system.
Air creates inefficiency because it has compression
and expansion rates that are higher than that of oil.
Air trapped in the oil may cause the following
symptoms:
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 reservoir is at the
proper oil level. If it is not, fill to the vehicle
manufacturer's specifications.
The following procedures should be performed with
the vehicle drive wheels off the ground, then
repeated under normal operating conditions.
WARNING
POTENTIAL FOR SERIOUS INJURY
Certain procedures required the vehicle engine
to be operated and the vehicle to be raised off
of the ground. To prevent possible injury to the
servicing technician and/or bystanders, insure
the vehicle is properly secured.
1. With the bypass valve open, (see Drive Wheel
Release on pg 16) and the engine running,
slowly move the directional control in both
forward and reverse directions (5 to 6 times).
As air is purged from the unit, the oil level in the
reservoir will drop.
2. With the bypass valve closed and the 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 engine.
3. It may be necessary to repeat steps 1 and 2
until all the air is completely purged from the
system. When the drive wheels rotate forward
and reverse at normal speed and the reservoir
oil remains at a constant level, purging is
complete.
WHEEL HUB NUT TORQUE SPECIFICATION
Service Interval: Every 500 hours thereafter
Torque the nut on the wheel motor tapered shaft to
175-225 ft-lb (237-305 N-m)
NOTE: Do NOT use anti-seize compound on the
wheel hub.
28
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