TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
12. HOOK ARM DOES NOT UNLOAD IN MANUAL MODE (MODEL A ONLY) (continued).
CONTINUITY TEST
(1) Open hydraulic cabinet cover.
(2) Loosen four screws on main junction
box cover and open 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.
(3) Remove connector from the hook arm
UNLOAD solenoid.
(4) Set multimeter to ohms position.
NOTE
A reading of infinity indicates an
open circuit.
HOOK ARM UNLOAD
Junction box terminal 13 is con-
SOLENOID HARNESS
nected to one side of the sole-
noid; terminal 14 is connected
to the other side.
(5) Connect multimeter leads to each end
SOLENOID
of wire, and check multimeter for
CONNECTOR,
POSITION 2
continuity. Check for continuity
between the solenoid connector,
position 1, and terminal strip, position
13.
(6) Repeat Step 5 to check for continuity
between position 2 in the connector
and terminal strip, position 14.
SOLENOID
CONNECTOR,
POSITION 1
Change 1
4-227
