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5.1.10 Hydraulic system air purge procedure.
Air must be purged from the hydraulic system when any hydraulic components,
including the oil filter, are removed or any of the hydraulic lines are
disconnected.
The critical area for purging air from the hydraulic system is between the oil
reservoir and each charge pump located on the top of each variable
displacement pump. (See Figure 10).
Air in other parts of the hydraulic system will be purged through normal
operation once the charge pumps are “primed”.
a) Stop engine and wait for all moving parts to stop. Raise the rear of the
machine up onto jack stands high enough to raise the drive wheels off the
ground.
b) Check oil level as stated in Section 5.1.8.
c) Start engine and move throttle control ahead to full throttle position. Move
the speed control lever to the middle speed position and place the drive
levers in the “drive” position.
If either drive wheel does not rotate,it is possible to assist the purging of
the charge pump by carefully rotating the tire in the forward direction.
NOTE: It is necessary to lightly touch the charge pump cap with
your hand to check the pump temperature. If the cap is too hot to
touch, turn off engine. The pumps may be damaged if the pump
becomes too hot.
If either drive wheel still does not rotate continue with step (d)
.
d) Thoroughly clean the area around each of the charge pump housings.
FIG. 10
CHARGE PUMP LOCATION
e) To “prime” charge pump, loosen two hex socket head capscrews (shown
in Figure 10)
1-1/2 turns only.
Make sure engine is not running
.
Lift
charge pump housing upward and wait for a steady flow of oil to flow out
from under housing.
Retighten capscrews
. Do this for both pumps.
Note: Hydraulic reservoir can be pressurized to up to 5 psi to speed this
process.
f) If either drive wheel still does not rotate, stop and repeat Steps (d)
through (e) above for the respective pump. If tires rotate slowly, the
system may prime after additional running. Check oil level as stated in
Section 5.1.8.
CHARGE PUMP CA
LOOSEN 1-1/2
TURNS ONLY
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