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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
priority valve port CF fitting.
(2)
Connect a 0 to 4,000 psi (0-27,567
kPa) pressure gauge to priority
valve port CF fitting.
(3)
Install pressure plug in CF port
hose.
(4)
Start engine (TM 10-3930-669-10).
(5)
With aid of assistant, fully turn
steering
wheel
and
observe
pressure gauge.
(a)
If 2,000 to 2.600 psi (13,780-
17,920
kPa)
are
not
measured, perform Steps (6)
and (7) below and replace
priority valve (Para 17-11).
(b)
If 2,000 to 2,600 psi (13,780-
17,920 kPa) are measured,
priority valve is OK.
(6)
Shut down engine.
(7)
Remove pressure gauge, tag, and
plug and connect hose to priority
valve port CF fitting.
PRESSURE TEST
(1)
Tag and disconnect hose from stack
valve shift spool port B hose fitting.
(2)
Connect a 0 to 4,000 psi (0-27,567
kPa) pressure gauge to stack valve
shift spool port B hose fitting.
(3)
Install pressure plug in shift spool
port B hose.
(4)
Start engine (TM 10-3930-669-10).
(5)
With the aid of an assistant, move
pivot/shift joystick to shift right
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 (6) and
(7) below and notify DS
Maintenance.
(b)
If 2,000 to 2,600 psi (13.780-
17,920 kPa) are measured,
stack valve is OK.
(6)
Shut down engine.
(7)
Remove pressure gauge, tag, and
plug and connect hose to stack
valve shift spool port B fitting.
(8)
Install cab floor plate (Para 15-12).
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