TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
16. MAIN FRAME, HOOK ARM, AND WINCH DO NOT OPERATE (continued).
10.
KNOWN INFO
TEST OPTIONS
Are 2228 volts mea-
Cab and remote controls
Voltage Test.
sured at the cab con-
inoperative.
trol box, connector
CB15 OK.
REASON FOR QUESTION
(J2), position N?
Hydraulic system OK.
The cab control box
POSSIBLE PROBLEMS
provides the main voltage
supply for CBT compo-
Cab control box faulty.
nents. If voltage is
Relay K9 faulty.
present at position N, the
Linking harness faulty.
cab control box is OK.
Main junction box wiring
No voltage measured at
faulty.
this connector indicates
CBT ground circuit
an open circuit in the cab
faulty.
control box.
Free flow valve solenoid
harness faulty.
Free flow valve solenoid
faulty.
Repair cab control
NO
box (para 4-71).
YES
4-368
