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
8.
TEST OPTIONS
LHS OK using manual
Are 2228 volts mea-
Voltage Test.
controls.
sured at main frame
Hook arm unloads OK.
junction box terminal
REASON FOR QUESTION
Main frame fails to
strip, position 3?
unload.
To verify if signal voltage
Hook arm up proximity
from the hook arm up
switch OK.
proximity switch is
Hook arm up proximity
reaching the main frame
switch LED OK.
junction box.
POSSIBLE PROBLEMS
Hook arm up proximity
switch faulty.
Main frame junction box
harness faulty.
Replace hook arm
Main LHS harness faulty.
up proximity switch
NO
Main junction box wiring
faulty.
Linking harness faulty.
Relay K8 faulty.
Cab control box faulty.
YES
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