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
9.
TEST OPTIONS
LHS OK using manual
Is there continuity
Continuity Test.
controls.
measured between the
Hook arm unloads OK.
main frame junction
REASON FOR QUESTION
Main frame fails to
box connector (J7) and
unload.
the main frame junc-
To verify the integrity of
Hook arm up proximity
tion box terminal
the hook arm up
switch OK.
strip?
proximity switch signal
circuit within the main
POSSIBLE PROBLEMS
frame junction box.
Main frame junction box
harness faulty.
Main LHS harness faulty.
Main junction box wiring
faulty.
Replace main
Linking harness faulty.
frame junction box
NO
Relay K8 faulty.
harness (para 4-
Cab control box faulty.
YES
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