TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
15. LHS DOES NOT OPERATE PROPERLY IN AUTO MODE (CAB ONLY)
(continued).
5.
TEST OPTIONS
KNOWN INFO
Are 2228 volts
LHS OK using manual
Voltage Test.
measured on the
controls.
socket for relay K8,
Hook arm fails to unload.
REASON FOR QUESTION
position 30?
POSSIBLE PROBLEMS
When unloading In the
AUTO mode, power is
LHS MODE SELECT
supplied from the function
switch faulty.
switch through the selec-
tor valve on to the rest of
the hook arm unload
circuit. If there is voltage
measured at the socket for
relay K8, the LHS MODE
SELECT switch is func-
tioning properly.
Repair cab
NO
control box
Refer to Fault
12, Hook Arm
YES
Does Not
Unload in
Manual Mode.
4-308
