338
TRIM AND TILT
TROUBLESHOOTING
bypass the reservoir cap. These steps will relieve
the pressure in the unit.
Remove the manual release valve retaining ring
using retaining ring pliers.
Remove the manual release valve. Install pres-
sure gauge and adapter “A” to check problems in
the UP circuit.
IMPORTANT: Torque gauge and adapter lightly
to 5 to 10 in. lbs. (0.6 to 1.2 N·m). Excessive
torque might damage adapter or O-rings.
Cycle the unit down and up several times to purge
air. With all rods fully extended, run the unit down
momentarily to reduce pressure. Check fluid level
again, and add fluid if necessary. Remember that
all rods must be completely extended to check
fluid level.
Starting with the tilt cylinder fully retracted, run the
unit UP.
• The gauge should show 0 to 200 psi (0 to 1379
kPa) as the tilt cylinder is extending.
• The gauge should show 1400 to 1600 psi (9653
to 11032 kPa) as the unit stalls.
• Release the switch and watch for a pressure
drop. The stall pressure reading must not drop
more than 200 psi (1379 kPa) after motor stops.
If results vary from the above limits, there is a
problem in the UP circuit. Refer to MODES OF
OPERATION (Three Piston System) on p. 329
for circuit description.
STEP 2
Remove the manual release valve retaining ring
using retaining ring pliers.
1. Manual release valve
2. Reservoir cap
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