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
6.
TEST OPTIONS
LHS OK using manual
Is the hook arm up
Refer to para 4-95.
controls.
proximity switch
Hook arm unloads OK.
adjusted properly?
REASON FOR QUESTION
Main frame fails to
The signal for cab control
unload.
box to change from hook
POSSIBLE PROBLEMS
arm UNLOAD to main
frame UNLOAD comes
Hook arm up proximity
from the hook arm up
switch faulty.
proximity switch. If the
Main frame junction box
gap is excessive, the
harness faulty.
switch will not detect the
Main LHS harness faulty.
presence of the hook
Main junction box wiring
arm.
faulty.
Linking harness faulty.
Relay K8 faulty.
Adjust hook arm up
Cab control box faulty.
NO
proximity switch
No power at main
junction box terminal
strip.
YES
4-310
