TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
15. LHS DOES NOT OPERATE PROPERLY IN AUTO MODE (CAB ONLY)
(continued).
2.
TEST OPTIONS
KNOWN INFO
Visual inspection.
LHS OK using manual
Does the LHS correctly
controls.
change from hook arm
Hook arm unloads OK.
UNLOAD to main
REASON FOR QUESTION
frame UNLOAD mode?
POSSIBLE PROBLEMS
To isolate the fault to a
specific location in the
Hook arm up proximity
electrical system.
switch faulty.
Main frame junction box
harness faulty.
Main LHS harness faulty.
Main junction box wiring
faulty.
Go to Step 6.
NO
Linking harness faulty.
Relay no. K8 faulty.
Cab control box faulty.
No power at main junction
box terminal strip.
LHS MODE SELECT
YES
switch faulty.
Main frame down
proximity switch faulty.
Relay K6 faulty.
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