TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
12. HOOK ARM DOES NOT UNLOAD IN MANUAL MODE.
INITIAL SETUP
Tools and Special Tools
Equipment Condition
Multimeter (ANURM105C)
Engine turned off (TM 9-2320-279-10)
Tool Kit, General Mechanic's: Automotive
Parking brake applied (TM 9-2320-279-10)
(SC 5180-90-N26)
Wheels chocked (TM 9-2320-279-10)
Personnel Required
Two
START
1.
TEST OPTIONS
KNOWN INFO
Visual inspection.
Error Code, EC 04 and/or
Does the hook arm
EC 17.
unload with either
REASON FOR QUESTION
the cab control or
POSSIBLE PROBLEMS
the remote control?
To determine if the fault
is located in the remote
Function switch faulty.
control circuit, cab
MODE SELECT switch
circuit, or the part of the
faulty.
circuit common to both.
Cab control box faulty.
Remote linking harness
faulty.
Remote control harness
faulty.
Remote control unit
faulty.
MODEL A, Go
Hook arm UNLOAD
to Step 6.
NO
solenoid harness faulty.
MODEL B, Go
Main junction box wiring
to Step 12.
faulty.
Linking harness faulty.
Directional control valve
YES
faulty.
Change 1
