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TM 9-2320-364-20-3
2-2720
11. LOSS OF CRANE FUNCTIONS (SWING, TELESCOPE, BOOM, AND HOIST).
INITIAL SETUP
1.
Replace tubes or
hoses (Para 20-3 and
schematic Figs 2-59
through 2-64).
Verify repair, go to
Step 15 of this Fault.
START
YES
NO
WINCH/CRANE switch in
CRANE position.
Main hydraulic reservoir full.
Outriggers operate.
Outriggers down with weight off
truck suspension.
Crane tubes or hoses faulty.
Accumulator or tube faulty.
Hose 2776 faulty.
White jumper wire from terminal
19 to 20 faulty.
Outrigger proximity switch (RH)
faulty.
Outrigger proximity switch (LH)
faulty.
Red wire from terminal 5 to
control lockout relay faulty.
Black wire from crane terminal 1
to control lockout relay faulty.
Green wire from control lockout
relay to black wire faulty.
Control lockout relay faulty.
Blue wire from control lockout
relay to crane terminal 8 faulty.
Crane system hydraulic
pressure valve harness
connector white wire faulty.
Crane system hydraulic
pressure valve harness
connector black wire faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Visual inspection.
Leaking or damaged hose or
tube will not deliver adequate
supply pressure or may restrict
return flow to reservoir.
2-29. CRANE TROUBLESHOOTING (CONT).
Tools and Special Tools
Tool Kit, General Mechanic’s: Automotive
(Item 74, Appendix G)
STE/ICE-R (optional) (Item 3, Appendix G)
Multimeter (Item 44, Appendix G)
Equipment Condition
Engine OFF, (TM 9-2320-364-10)
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
Crane outriggers down, (TM 9-2320-364-10)
Mast fully erected, (TM 9-2320-364-10)
References
TM 9-2320-364-10
TM 9-4910-571-12&P
Are crane tubes and hoses
free of leaks and damage?
WARNING
Read WARNING
on Page 2-2721
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