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
17.
TEST OPTIONS
LHS OK using manual
Is the main frame down
Refer to para 4-96.
controls.
proximity switch ad-
Hook arm and main
justed properly?
REASON FOR QUESTION
frame unload OK.
The signal for cab control
Main frame loads OK.
box to change from main
Hook arm fails to load.
frame load to hook arm
POSSIBLE PROBLEMS
load comes from the main
frame down proximity
Main frame down
switch. If the gap is
proximity switch faulty.
excessive, the switch will
Main frame junction box
not detect the presence
harness faulty.
of the main frame.
Main LHS harness faulty.
Main junction box wiring
faulty.
Linking harness faulty.
Adjust main frame
Relay K6 faulty.
down proximity
NO
Cab control box faulty.
switch (para 4-96).
YES
4-332
