LOSS OF HOOK ARM LOAD HOLDING. (Cont) -726250387

TM 9-2320-364-34-1

High pressure hydraulics [oil under 3675 psi (25,339 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.

All personnel must stand clear during lifting operations. A swinging or shifting load may cause injury or

death to personnel.

Do not get under LHS when disconnecting or

connecting connectors or hoses. A hydraulic

malfunction could cause LHS to lower causing

serious injury.

NOTE

Use drain pan to catch leaking hydraulic oil.

VISUAL INSPECTION

(1) Attach 500 lb (227 kg) minimum

load to hook.

(2) Raise hook arm approximately half

of its travel (TM 9-2320-364-10).

(3) Set hydraulic selector switch to OFF

position.

(4) Turn OFF ENGINE switch.

(5) Disconnect hose 2881 from LH hook

arm manifold, port VB. Plug hose.

(6) Disconnect hose 2892 from RH

hook arm manifold, port VB. Plug

hose.

(6) Allow one to two minutes to pass to

allow excess oil laying in manifold

to drain out.

(a) If hydraulic fluid stops draining

from hook arm manifolds, load

control valves are OK. Perform

Steps (7) through (13) below and

go to Step 3 of this Fault.

(b) If hydraulic fluid continues to

drain from LH or RH hook arm

manifold at port VB, remove plug

from hose and connect hose to

hook arm manifold that does not

leak. Replace load control valve

at leaking port VB (Para 17-13).

(7) Remove plugs from hoses 2881

and 2892.

(8) Connect hose 2881 to LH hook arm

manifold, port VB and hose 2892 to

RH hook arm manifold, port VB.

(9) Turn ON ENGINE switch.

(10) Set hydraulic selector switch to

MAN HA position.

(11) Disengage LHS hook arm from load.

(12) Set hydraulic selector switch to OFF

position.

(13) Turn OFF ENGINE switch.

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