TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
15. LHS DOES NOT OPERATE PROPERLY IN AUTO MODE (CAB ONLY)
(continued).
18.
KNOWN INFO
TEST OPTIONS
LHS OK using manual
Is the LED on the main
Visual inspection.
controls.
frame down proximity
Hook arm and main frame
switch illuminated?
REASON FOR QUESTION
unload OK.
To determine if voltage is
Main frame loads OK.
being supplied to the main
Hook arm fails to load.
frame down proximity
Main frame down proximity
switch and to verify if the
switch OK.
switch is functioning
POSSIBLE PROBLEMS
properly.
Main frame down proximity
switch faulty.
Main frame junction box
harness faulty.
Main LHS harness faulty.
Go to Step 25.
Main junction box wiring
NO
faulty.
Linking harness faulty.
Relay K6 faulty.
Cab control box faulty.
YES
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