TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
15. LHS DOES NOT OPERATE PROPERLY IN AUTO MODE (CAB ONLY)
(continued).
4.
TEST OPTIONS
KNOWN INFO
Visual inspection.
LHS OK using manual
Does the LHS correctly
controls.
change from main
Hook arm and main frame
frame LOAD to hook
REASON FOR QUESTION
unload OK.
arm LOAD mode?
To isolate the fault to a
Main frame loads OK.
specific location in the
POSSIBLE PROBLEMS
electrical system.
Main frame down
proximity switch faulty.
Main frame junction box
harness faulty.
Main LHS harness faulty.
Main junction box wiring
faulty.
Linking harness faulty.
Go to Step 17.
Relay K6 faulty.
NO
Cab control box faulty.
LHS MODE SELECT
switch faulty.
Review the
questions in this
YES
fault beginning with
Step 1.
4-306
