TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
12. HOOK ARM DOES NOT UNLOAD IN MANUAL MODE (MODEL B ONLY) (continued).
NOTE
The digital controller and the cab control box are not repairable,
therefore, it is necessary to test the digital controller and cab
interface wiring harnesses, switches, solenoids, and other com-
ponents to identify possible faults other than the digital controller
and the digital cab controller.
13.
TEST OPTIONS
KNOWN INFO
Error Code, EC 04.
Continuity Tests.
Is there continuity
Remote control unit OK.
measured at the Digital
REASON FOR QUESTION
Remote control cable
controller wiring har-
OK.
ness (J3), (J4) and (P2)?
If there is no continuity
Cab digital control box
at the designated
OK.
positions on the digital
Cab interface wiring
controller wiring harness,
harness OK.
the 24 volt power from
the cab digital control
POSSIBLE PROBLEMS
box does not reach the
digital control box.
Digital controller wiring
harness faulty.
Unload valve solenoid
faulty.
Digital control box faulty.
Repair or replace
digital controller
NO
wiring harness
YES
4-240.4
4- 36
Change 1
