TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
15. LHS DOES NOT OPERATE PROPERLY IN AUTO MODE (CAB ONLY).
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.
Does the hook arm
LHS OK using manual
unload properly
controls.
REASON FOR QUESTION
from the stowed
POSSIBLE PROBLEMS
position?
To isolate the fault to a
specific location in the
Hook arm up proximity
electrical system.
switch faulty.
Main frame junction box
harness faulty.
Main LHS harness faulty.
Main junction box wiring
faulty.
Linking harness faulty.
Relay no. K8 faulty.
NO
Go to Step 5.
Cab control box faulty.
No power at main junction
box terminal strip.
MODE SELECT switch
faulty.
YES
Main frame down
proximity switch faulty.
Relay K6 faulty.
