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
20.
TEST OPTIONS
LHS OK using manual
Is there continuity
Continuity Test.
controls.
measured between the
Hook arm and main
main frame junction
REASON FOR QUESTION
frame unload OK.
box connector (J7) and
Main frame loads OK.
the main frame junc-
To verify the integrity of
Hook arm fails to load.
tion box terminal
the hook arm down
Main frame down
strip?
proximity switch signal
proximity switch OK.
circuit within the main
frame junction box.
POSSIBLE PROBLEMS
Main frame junction box
harness faulty.
Main LHS harness faulty.
Main junction box wiring
Replace main
faulty.
frame junction box
NO
Linking harness faulty.
harness (para 4-
Relay K6 faulty.
Cab control box faulty.
YES
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