MAST DOES NOT OPERATE OR OPERATES SLOWLY. (Cont) -726250571

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) Tag, mark and disconnect hose

from fitting at bottom of MAST four

way valve. Discard preformed

packing.

(2) Connect adapter hose with

preformed packing to disconnected

hose.

(3) Connect adapter hose to flowmeter

OUT port.

(4) Connect adapter hose with

preformed packing to fitting.

(5) Connect adapter hose to flowmeter

IN port.

(6) Open flowmeter load valve.

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

(8) Set WINCH/CRANE switch to

CRANE.

(9) Set hydraulic selector switch to

CRANE/SRW position.

(10) Turn ON crane POWER switch.

(11) Raise mast completely using MAST

control lever.

(12) Hold MAST control lever in UP

position while observing flowmeter.

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

are present, lift cylinder piston

seals are faulty. Perform

Steps (13) through (19) below

and replace erection cylinder

(Para 16-5).

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

lift cylinder piston seals are OK.

(13) Set crane POWER switch to

OFF position.

(14) Set hydraulic selector switch to OFF

position.

(15) Turn OFF ENGINE switch.

(16) Disconnect adapter hose from crane

hose. Discard preformed packing.

(17) Disconnect adapter hose from

fitting. Discard preformed packing.

(18) Lubricate preformed packing.

(19) Connect crane hose with preformed

packing to fitting.

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