TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
15. LHS DOES NOT OPERATE PROPERLY IN AUTO MODE (CAB ONLY)
(continued).
23.
KNOWN INFO
TEST OPTIONS
Is there continuity mea-
LHS OK using manual
Continuity Test.
sured on the (24-pin)
controls.
linking harness between
Hook arm and main frame
REASON FOR QUESTION
cab control box connec-
unload OK.
tor (P2) and main junc-
Supply voltage, signal
Main frame loads OK.
tion box connector (P4)?
voltage, and ground circuit
Hook arm fails to load.
are transferred from the
Main frame down
cab control box to the
proximity switch OK.
main junction box via this
Main frame down
harness. Faults in this
proximity switch OK.
harness will prevent proper
Main frame junction box
LHS operation.
wire harness OK.
Main LHS harness OK.
Main junction box wiring
OK.
Replace (24-pin)
NO
linking harness
POSSIBLE PROBLEMS
Linking harness faulty.
Relay K6 faulty.
Cab control box faulty.
YES
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