TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
11. HOOK ARM DOES NOT LOAD IN MANUAL MODE (MODEL B ONLY) (continued).
HYDRAULICCABINET
CONTINUITY TEST
COVER
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.
HOOK ARM LOAD
(2) Remove right hand (J3) and left hand
SOLENOID
(J4), 40-pin connectors from digital
CONNECTOR
contoller.
(3) Set multimeter to ohms position.
POSITION 1
POSITION 2
NOTE
A reading of infinity indicates an
open circuit.
J3
POSITION 4
POSITION
(4) Connect multimeter between digital
34
POSITION
controller wiring harness connector,
35
(P2), position "2", and (J4), position
POSITION
"1". Check multimeter for continuity.
33
(5) Connect multimeter between (P2),
position "3", and (J4), position "35".
Check multimeter for continuity.
(6) Connect multimeter between (P2),
POSITION
1
position "4", and (J4), position "33".
Check multimeter for continuity.
(7) Connect multimeter between (J3),
J4
position "4", and hook arm load
solenoid connector, position "1".
Check multimeter for continuity.
(8) Connect multimeter between (J3),
position "34", and hook arm load
P2
solenoid connector, position "2".
Check multimeter for continuity.
POSITION 4
POSITION 3
Change 1
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4-2 5
