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TM 10-3930-669-20
WARNING
•
High-pressure hydraulics [oil under 3,000 psi (20,700 kPa) pressure] operate this equipment.
Refer to vehicle operator and maintenance manuals for hydraulic oil pressure. Never disconnect
any hydraulic line or fitting without first dropping pressure to zero. Failure to comply may result
in injury to personnel.
•
Hydraulic oil is slippery and can cause falls. To avoid injury, wipe up spilled oil with rags.
PRESSURE TEST
(1) Tag and disconnect hose from stack
valve tilt spool port A hose fitting.
(2) Connect a 0 to 4,000 psi (0-27,567
kPa) pressure gauge to stack valve
tilt spool port A hose fitting.
(3) Install pressure cap on stack valve
spool open port.
(4) Start engine (TM 10-3930-669-10).
(5) With the aid of an assistant, move
tilt/lift joystick to tilt forward position
and observe pressure gauge
(TM 10-3930-669-10).
(a) If 2,000 to 2,600 psi (13,780-
17,920 kPa) are not measured,
stack valve is faulty. Perform
Steps (6) and (7) below and
notify DS Maintenance.
(b) If 2,000 to 2,600 psi (13.780-
17.920 kPa) are measured, go
to Step (6) below.
(6) Shut down engine.
(7) Remove pressure gauge, tag, cap,
and connect hose to stack valve
tilt spool port A fitting.
(8) Tag and disconnect hose from stack
valve tilt spool port B hose fitting.
(9) Connect a 0 to 4,000 psi (0-27,567
kPa) pressure gauge to stack valve
tilt spool port A hose fitting.
(10) Install pressure cap on stack valve
spool open port.
(11) Start engine.
(12) Move tilt/lift joystick to tilt back
position and observe pressure
gauge.
(a) If 2,000 to 2,600 psi (13,780-
17,920 kPa) are not measured,
stack valve is faulty. Perform
Steps (13) and (14) below
and notify DS Maintenance
(b) If 2,000 to 2,600 psi (13,780-
17,920 kPa) are measured,
slack valve is OK.
(13) Shut down engine.
(14) Remove pressure gauge, tag, cap,
and connect hose to stack valve
tilt spool port A fitting.
(15) Install cab floor plate (Para 15-12).
(16) Close right-hand engine access
cover.
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