TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
15. LHS DOES NOT OPERATE PROPERLY IN AUTO MODE (CAB ONLY)
(continued).
25.
KNOWN INFO
TEST OPTIONS
Are 2228 volts mea-
LHS OK using manual
Voltage Test.
sured on the main frame
controls.
junction box terminal
Hook arm and main frame
REASON FOR QUESTION
strip, position 1?
unload OK.
To verify that proximity
Main frame loads OK.
switch supply voltage is
Hook arm fails to load.
reaching the main frame
Main frame down
junction box from the main
proximity switch LED out.
junction box.
POSSIBLE PROBLEMS
Main frame down
proximity switch faulty.
Main frame junction box
harness faulty.
Replace main
frame junction
NO
box harness
Replace main
frame down
YES
proximity switch
4-348
