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TM 9-2320-364-34-1
High pressure hydraulics [oil under 3000 psi (20,685 kPa) pressure] operate this equipment. Refer to
vehicle operator and maintenance manuals for hydraulic oil pressure. Never disconnect any hydraulic
line or fitting without first dropping pressure to zero. Failure to comply may result in injury to personnel.
Fuel and oil are slippery and can cause falls. To avoid injury, wipe up spilled fuel or oil with rags.
NOTE
Use a drain pan to catch leaking hydraulic oil.
VISUAL INSPECTION
(1) Tag, mark and disconnect three hoses
from hoist motor valve.
Discard preformed packings.
(2) Remove four screws, lockwashers,
hoist motor valve and two
preformed packings from hoist motor.
Discard preformed packings and
lockwashers.
(3) Remove safety relief (holding) valve,
three preformed packings, backup
rings and orifice from hoist motor valve.
Discard three preformed packings
and backup rings.
(a) If orifice is clogged with
contaminants, clean or replace
orifice (Para 16-13) and perform
Steps (4) through (7) below.
(b) If orifice is OK, safety relief
valve is faulty. Replace
safety relief valve in hoist motor
valve (Para 16-13) and perform
Steps (4) through (7) below.
(4) Install preformed packing, backup
ring, preformed packing, two backup
rings and preformed packing on
safety relief valve.
(5) Install orifice and safety relief valve
in hoist motor valve.
(6) Install hoist motor valve with
two preformed packings and four
screws and lockwashers.
(7) Install three hoses with preformed
packings on hoist motor valve.

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