MAST DOES NOT LOWER. (Cont) -726250593

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.

FLOW/PRESSURE TEST

(1) Tag, mark and disconnect hose

from fitting at bottom of MAST

valve. Discard preformed packing.

(2) Plug hose with metal plug.

(3) Tag, mark and disconnect hose

from elbow at bottom of MAST

valve. Discard preformed packing.

(4) Plug hose with metal plug.

(5) Connect adapter hose with

preformed packing to elbow.

(6) Connect adapter hose to flowmeter

IN port.

(7) Connect adapter hose with

preformed packing to fitting.

(8) Connect adapter hose to flowmeter

OUT port.

(9) Open flowmeter load valve.

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

(11) Set WINCH/CRANE switch to

CRANE position.

(12) Set hydraulic selector switch to

CRANE/SRW position.

(13) Set crane POWER switch to

ON position.

(14) Hold MAST control lever in DOWN

position.

(a) If 6 gpm (23 lpm) or more

are not present, perform

Steps (15) through (20) below

and replace MAST valve on three

valve bank (Para 16-27).

(b) If at least 6 gpm (23 lpm) are

present, three valve bank is OK.

(15) Set crane POWER switch to

OFF position.

(16) Set hydraulics selector switch to

OFF position.

(17) Turn OFF ENGINE switch.

(18) Disconnect adapter hoses from

elbow and fitting. Discard

preformed packings.

(19) Remove metal plugs from two

hoses.

(20) Connect two hoses with preformed

packings to elbow and fitting.

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