TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
16.1 MAIN FRAME, HOOK ARM, AND WINCH DO NOT OPERATE (MODEL B ONLY)
(continued).
NOTE
The digital controller and the cab digital control box are not
repairable, therefore, it is necessary to test the digital controller and
cab interface wiring harnesses, switches, solenoids, and other
components to identify possible faults other than the digital
controller and the digital cab controller.
3.
KNOWN INFO
TEST OPTIONS
Error Code, EC 01, EC
Voltage Test.
Are 22-28 volts
08 and/or EC 19.
measured at the cab
REASON FOR QUESTION
Quick-disconnect
interface wiring
couplings installed
Power to activate the hook
harness connector
properly.
arm solenoid is supplied
(J2), position "2" and
Hydraulic lines, hoses,
from the cab digital control
position "3"?
or fittings OK.
box to the digital controller
wiring harness via this
POSSIBLE PROBLEMS
harness. Faults in this
harness will prevent
Cab digital control box
operation from the cab
faulty.
digital control box.
Cab interface wiring
harness faulty.
Digital controller wiring
harness faulty.
Free flow valve faulty.
Digital control box faulty.
Repair or replace
cab interface
NO
wiring harness
YES
4-396.6
80
Change 1
