TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
15. LHS DOES NOT OPERATE PROPERLY IN AUTO MODE (CAB ONLY)
(continued).
3.
TEST OPTIONS
KNOWN INFO
Visual inspection.
LHS OK using manual
Does the main frame
controls.
load properly from
Hook arm and main
the fully extended
REASON FOR QUESTION
frame unload OK.
position?
To isolate the fault to a
POSSIBLE PROBLEMS
specific location in the
Main frame down
electrical system.
proximity switch faulty.
Main frame junction box
harness faulty.
Main LHS harness faulty.
Main junction box wiring
faulty.
Go to Step 16.
NO
Linking harness faulty.
Relay K6 faulty.
Cab control box faulty.
LHS MODE SELECT
switch faulty.
YES
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