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Page Title:
LOSS OF HOOK ARM SAFE LOWERING. (Cont) |
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 TM 9-2320-364-34-1
Do not get under LHS when disconnecting or
connecting connectors and 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.
Do not scratch surface of cylinder rod. Damage
to cylinder seals could result causing cylinder
failure.
VISUAL INSPECTION
(1) Raise hook arm approximately
24 in. (61 cm) and block into
position.
(2) Turn OFF ENGINE switch
(TM 9-2320-364-10).
(3) Loosen connector screw and
disconnect connector from safe
lowering solenoid valve in port VA
on RH hook arm manifold.
(4) Remove safe lowering solenoid
valve and preformed packings from
RH hook arm manifold. Discard
preformed packings.
(5) Attempt to push poppet into valve
toward solenoid coil.
(a) If poppet does not move, replace
safe lowering solenoid valve
(Para 17-13). Perform Step (14)
below and go to Step 4 of
this Fault.
(b) If poppet moves, perform
Steps (6) through (8) below.
(6) Connect connector to removed safe
lowering solenoid valve and tighten
connector screw.
(7) Turn ON ENGINE switch.
(8) With the aid of an assistant, hold in
safe lowering button and observe
the poppet valve.
(a) If poppet does not move, turn
OFF ENGINE switch and replace
the solenoid coil (Para 17-13).
Perform Step (14) below and go
to Step 4 of this Fault.
(b) If poppet moves, the solenoid
coil is OK. Perform Steps (9)
through (13) below and go to
Step 3 of this Fault.
(9) Turn OFF ENGINE switch.
(10) Disconnect connector from removed
safe lowering solenoid valves.
(11) Install safe lowering solenoid valve
and preformed packings in port VA
on RH hook arm manifold.
(12) Connect connector to safe
lowering solenoid valve.
(13) Tighten screw and coat head of
screw with sealing compound.
(14) Remove two wooden blocks from
hook arm.
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