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Page Title:
HOOK ARM DOES NOT UNLOAD. (Cont) |
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 TM 9-2320-364-34-1
Do not get under LHS when disconnecting or
connecting connectors or hoses. A hydraulic
malfunction could cause LHS to lower causing
serious injury or death.
Adhesives, solvents, and sealing compounds
can burn easily, can give off harmful vapors,
and are harmful to skin and clothing. To avoid
injury or death, keep away from open fire and
use in well-ventilated area. If adhesives, solvent,
or sealing compound gets on skin or clothing,
wash immediately with soap and water.
OPERATION TEST
(1) With the aid of an assistant, raise
hook arm approximately 24 in. (61 cm)
while holding in hook arm safe
lowering button (TM 9-2320-364-10).
(2) Set hydraulic selector switch to
MAN HA.
(3) Loosen connector screw and
disconnect connector from safe
lowering solenoid valve on port VB
side of RH hook arm manifold.
(4) With the aid of an assistant, attempt
to unload using cab joystick while
pushing in hook arm safe lowering
button.
(a) If hook arm does not unload,
load control valve is faulty.
Perform Steps (5) through (8)
below and repair RH hook arm
manifold at port VB (Para 17-13).
(b) If hook arm unloads, load control
valve is faulty. Perform Steps (5)
through (8) below and repair LH
hook arm manifold at port VB
(Para 17-13).
(5) Connect connector to safe lowering
solenoid valve on port VB side of
RH hook arm manifold.
(6) Tighten connector screw and coat
head of connector screw with
sealing compound.
(7) Set hydraulic selector switch to OFF
position.
(8) Turn OFF ENGINE switch.
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