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
10.
TEST OPTIONS
LHS OK using manual
Is there continuity
Continuity Test.
controls.
measured on the main
REASON FOR QUESTION
Hook arm unloads OK.
LHS wire harness,
Main frame fails to
between the main
The hook arm up
unload.
frame junction box
proximity switch signal is
Hook arm up proximity
harness connector (P6)
transferred from the main
switch OK.
and connector (P7)?
frame junction box to the
Main frame junction box
main junction box via this
harness OK.
harness. Faults in this
harness will prevent
POSSIBLE PROBLEMS
AUTO operation.
Main LHS harness faulty.
Main junction box wiring
faulty.
Replace main LHS
Linking harness faulty.
wiring harness
NO
Relay K8 faulty.
Cab control box faulty.
YES
4-318
