HOIST DOES NOT LOWER. (Cont) -726250741

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.