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HYDRO-GEAR TRANSAXLE
4.
Rotate the adjusting puck in both directions and
watch the axle direction. You want to adjust the
puck so it is set in the mid-point between forward
and reverse axle rotation. Make sure the axle is
not moving (Figure 143).
Figure 143
5.
Once you are in neutral, hold the puck with an
adjustable wrench so it won't move when you re-
tighten the Allen set screw (Figure 144).
Figure 144
6.
Operate the foot control in forward and reverse
and allow the pedal to return to the neutral
position to test the adjustment.
NOTE: You may not be able to eliminate creep
entirely, due to the narrow neutral zone of this
transaxle. In this case, adjust for the smallest amount
of reverse creep possible. Correctly adjusted, a very
light tap on the foot control pedal should be all that is
needed to stop the reverse creep.
3 - 8
Transaxle Purging Procedures
Due to the effects air has on efficiency in hydrostatic
drive applications, it is critical that it be purged from the
system.
These purge procedures should be implemented any
time oil has been added to the system, when a new
transaxle is installed, or after a transaxle has been
repaired.
Air creates inefficiency because its compression and
expansion rate is higher than that of the oil normally
approved for use in hydrostatic drive systems.
The resulting symptoms in hydrostatic systems may
be:
1.
Noisy operation.
2.
Lack of power or drive after short term of
operation.
1703-08
3.
High operation temperature and excessive
expansion of "oil"; in the latter case, oil may
overflow.
Before starting, make sure the transaxle is at the
specified oil level; refer to page 1 - 3.
The following procedures should be performed with the
vehicle drive wheels off the ground, then repeated
under normal operating conditions.
1.
With the bypass valve open and the engine
running, slowly move the directional control (foot
control) in both forward and reverse directions 5 to
6 times; as air is purged from the unit, the oil level
will drop.
2.
With the bypass valve in the closed position and
the engine running, slowly move the directional
MVC-226X
control valve (foot control) in both forward and
reverse directions 5 to 6 times. After stopping the
engine, check the oil level and add oil as required.
3.
It may be necessary to repeat steps 1 and 2 until
all the air is completely purged from the system.
When the transaxle moves forward and reverse at
normal speed, purging is complete.
400XT Series Tractor Service Manual
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