BOOM DOES NOT LOWER OR LOWERS SLOWLY. (Cont) -726250695

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.

FLOWMETER TEST

(1) Set crane POWER switch to

OFF position (TM 9-2320-364-10).

(2) Set hydraulic selector switch to OFF

position.

(3) Turn OFF ENGINE switch.

(4) Tag, mark and disconnect two

hoses from boom lift cylinder on

LHS side of boom.

Discard preformed packings.

(5) Install plugs with preformed

packings on disconnected hoses.

(6) Install caps with preformed packings

on two cylinder fittings.

(7) Start engine.

(8) Set WINCH/CRANE switch to

CRANE position.

(9) Set hydraulic selector switch to

CRANE/SRW position.

(10) Set crane POWER switch to

ON position.

(11) Hold BOOM lever in DOWN

position.

(a) If more than 0 gpm (0 lpm) are

measured, perform Steps (12)

through (20) below and replace

cylinder that is on the LHS side

of the boom (Para 16-6).

(b) If 0 gpm (0 lpm) are measured,

perform Steps (12) through (20)

below and replace cylinder that

is on cab side of boom

(Para 16-6).

(12) Set crane POWER switch to

OFF position.

(13) Set hydraulics selector switch to

OFF position.

(14) Turn OFF ENGINE switch.

(15) Remove two caps from cylinder

assemblies. Discard preformed

packings.

(16) Remove two plugs from hoses.

Discard preformed packings.

(17) Connect two hoses with preformed

packings to boom lift cylinder.

(18) Disconnect adapter hoses from

elbow and crane hose. Discard

preformed packings.

(19) Connect crane hose with preformed

packing to elbow.

(20) Install cover with four screws,

washers, lockwashers and nuts.

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