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TM 9-2320-364-20-3
2-2570
4. BOOM WILL NOT LOWER USING REMOTE CONTROL UNIT (CONT).
4.
Replace controller
circuit card
(Para 18-4).
Verify repair, go to
Step 9 of this Fault.
YES
NO
Boom operates using manual
control.
At least one other remote
control function operates.
Remote control unit harness
OK.
Controller switch OK.
Controller circuit card faulty.
Remote control unit cable
faulty.
Brown Wire from truck remote
control connector outlet to
terminal 14 faulty.
White wire from terminal 14 to
solenoid faulty.
Solenoid black wire faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
If circuit card is faulty, 22 to 28
vdc will not be present in crane
main junction box.
WARNING
Are 22 to 28 vdc measured at
the four terminal connector
blue wire with lever in DOWN
position?
Read WARNING
on Page 2-2571
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