TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
15. LHS DOES NOT OPERATE PROPERLY IN AUTO MODE (CAB ONLY)
(continued).
KNOWN INFO
7.
TEST OPTIONS
LHS OK using manual
Is the LED on the hook
Visual inspection.
controls.
arm up proximity
Hook arm unloads OK.
switch illuminated?
REASON FOR QUESTION
Main frame fails to
To determine if voltage is
unload.
being supplied to the
Hook arm up proximity
hook arm up proximity
switch OK.
switch and to verify if the
POSSIBLE PROBLEMS
switch is functioning
properly.
Hook arm up proximity
switch faulty.
Main frame junction box
harness faulty.
Main LHS harness faulty.
Main junction box wiring
Go to Step 14.
faulty.
NO
Linking harness faulty.
Relay K8 faulty.
Cab control box faulty.
No power at main
junction box terminal
YES
strip.
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