TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
12. HOOK ARM DOES NOT UNLOAD IN MANUAL MODE (MODEL B ONLY) (continued).
HYDRAULICCABINET
COVER
CONTINUITY TEST
CAUTION
Electrical power must be shut off
from circuit before continuity can
be checked. Failure to comply with
this caution may result in damage
to test equipment or electrical sys-
tem.
(1) Remove five screws and flatwashers
from hydraulic cabinet cover and
remove cover.
POSITION
(2) Remove right hand (J3) and left hand
1
(J4), 40-pin connectors from digital
HOOK ARM UNLOAD
contoller.
SOLENOID
(3) Remove unload solenoid connector
CONNECTOR
from unload solenoid valve.
POSITION
(4) Set multimeter to ohms position.
2
NOTE
J3
POSITION 3
POSITION
33
A reading of infinity indicates an
POSITION
open circuit.
35
POSITION
33
(5) Connect multimeter between digital
controller wiring harness connector,
(P2), position "2", and (J4), position
"1". Check multimeter for continuity.
POSITION
(6) Connect multimeter between (P2),
1
position "3", and (J4), position "35".
Check multimeter for continuity.
(7) Connect multimeter between (P2),
J4
position "4", and (J4), position "33".
Check multimeter for continuity.
(8) Connect multimeter between (J3),
position "3", and hook arm unload
solenoid connector, position "1".
P2
Check multimeter for continuity.
(9) Connect multimeter between (J3),
position "33", and hook arm unload
solenoid connector, position "2".
Check multimeter for continuity.
POSITION 4
POSITION 3
4-449241
2- - 55
36..4
Change 1
