BOOM DOES NOT RAISE OR RAISES SLOWLY. (Cont) -726250683

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 three

hoses from boom lift cylinder on

side of boom without OSS box.

Discard preformed packings.

(2) Install plugs with preformed

packings on disconnected hoses.

(3) Install caps with preformed packings

on two cylinder fittings closest to

four valve bank.

(4) Disconnect flowmeter OUT port

adapter hose from crane hose.

Discard preformed packing.

(5) Install plug with preformed packing

in crane hose.

(6) Connect adapter hose with

preformed packing to remaining

fitting on boom lift cylinder.

(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) Hook hoist block on ring and take

out slack in cable to prevent boom

from raising.

(12) Hold BOOM lever in UP position.

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

measured, perform Steps (13)

through (22) below and replace

cylinder that is not on the OSS

side of the boom (Para 16-6).

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

perform Steps (13) through (22)

below replace cylinder that is on

OSS side of boom (Para 16-6).

(13) Set crane POWER switch to

OFF position.

(14) Set hydraulics selector switch to

OFF position.

(15) Turn OFF ENGINE switch.

Continued on next page.

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