TM 9--2350--292--20--1
0097 00--5
BOOM FAILS TO OPERATE OR OPERATES ROUGHLY -- CONTINUED
0097 00
H
Is pressure at shutoff valve PILOT port greater than 0
but less than 60 psi?
CONTINUED FROM STEP G
no
yes
CONTINUED ON NEXT PAGE
1. Place boom safety valve handle in STOW
position.
2. Perform Step G, steps 4 thru 6.
Notify Direct Support
Maintenance.
I
If boom control handle is in RETRACT, is pressure at
P-- test 1800--2300 psi and BL port pressure1575--1900
psi and BR port pressure 75 or less?
1. Remove gauges and tees and reconnect hose/plugs
to ports.
2. Install 0--5000 psi dial pressure gauge in P test port
of hydraulic control valve manifold assembly.
3. Install 0--4000 psi testing gauge assembly in BR test
port of hydraulic control valve manifold assembly.
4. Install 0--4000 psi testing gauge assembly in BL test
port of hydraulic control valve manifold assembly.
5. If boom is stowed in travel lock place wood blocks
between boom and hull forward of air cleaner inlets.
6. Start main engine, set speed to 1800 rpm and
energize main hydraulics (TM 9--2350--292--10).
7. Place boom control handle in RETRACT position (if
boom is in live range place handle to FORWARD
position).
8. Read gauges and record pressures.
9. Shut down hydraulics and main engine
(TM 9--2350--292--10).
Is pressure at port A 440--625 psi?
no
yes
Notify Direct Support
Maintenance.
CONTINUED FROM
STEP U
WARNING