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Section 5 -ADJUSTMENTS
& REPAIR
5.11 HYDRAULIC SYSTEM, PURGING
After replacing or repairing hydraulic system compo-
nents, one or both of the wheel drives may net pull
properly. This is likely to be caused by air entrapped in
the system, If you experience
a pulling issue after
completing repairs, perform the following procedure to
purge the air from one or both of the hydraulic drive
systems.
IMPORTANT:
WHEN
REPLACING
THE
HYDRAULIC
FLUID FILTERS, PRE-FILL
WITH OIL (SAE 20W50 API
SL) BEFORE INSTALLING. PRE-FILLING
THE FILTERS
WITH OIL WILL
REDUCE OR POSSIBLY
ELIMINATE
THE NEED TO PURGE THE SYSTEM OF ENTRAPPED
AIR
1. Locate hydraulic reservoirs underneath operator's
seat. After thoroughly cleaning the area around the top
of each reservoir, remove filler cap. Bring fluid to prop-
er level (1 _½"below the top of the filler neck),
With
engine off, add SAE 20W50 automotive oil. See Figure
4.6.
NOTE:
In order to raise operator
set to access
reservoirs, seat must be in rearmost position.
2. Open pressure relief valve on hydraulic pump, turn-
ing counter clockwise 2 full turns. See Figure 3.3.
3. Carefully
raise the rear of the machine
so the
wheels
are off of the ground.
Securely
block the
machine to prevent it from falling,
4. While seated in the operator's
position, start the
engine, Place engine speed control in FAST position.
5. Release parking brake and move motion control
levers out of the neutral lock position,
6. Slowly move motion control levers to the full for-
ward and then to the full rearward positions. Repeat
this process 6 times.
7. Stop engine and wait for all rotation to stop before
leaving the operator's position,
8. Close pressure relief valve on hydraulic pump, turn-
ing clockwise. Tighten snuggly.
9. With pressure relief valve closed, repeat Steps 4
thru 7.
10. Remove blocks and lower rear of machine.
11. Check fluid level in reservoir. Add SAE 20W50
automotive oil as required to bring fluid level to 1J/2"
from top of filler neck. De Not over fill.
12. Install and tighten filler cap.
28
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