BOOM DOES NOT OPERATE OR OPERATES SLOWLY. (Cont) -726250699

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) Remove four nuts, lockwashers,

washers and screws and cover.

Discard lockwashers.

(2) Tag, mark and disconnect two

hoses from elbows at top of four

valve bank above BOOM valve.

Discard preformed packings.

(3) Connect adapter hose with

preformed packing to inboard

(smaller) elbow.

(4) Connect adapter hose to flowmeter

OUT port.

(5) Connect adapter hose with

preformed packing to outboard

(taller) elbow.

(6) Connect adapter hose to flowmeter

IN port.

(7) Open flowmeter load valve.

(8) Start engine (TM 9-2320-364-10).

(9) Set WINCH/CRANE switch to

CRANE position.

(10) Set hydraulic selector switch to

CRANE/SRW position.

(11) Set crane POWER switch to

ON position.

(12) Hold BOOM control lever in the UP

position and then in the DOWN

position.

(a) If 4 gpm (15 lpm) or more

are not present, perform

Steps (13) through (17) below

and go to Step 4 of this Fault.

(b) If 4 gpm (15 lpm) or more are

present, perform Steps (13)

through (15) below and go to

Step 2 of this Fault.

(13) Set crane POWER switch to

OFF position.

(14) Set hydraulics selector switch to

OFF position.

(15) Turn OFF ENGINE switch.

(16) Disconnect adapter hoses from

elbows. Discard preformed

packings.

(17) Connect two hoses with preformed

packings to elbows.

2-615