MIDDLE FRAME DOES NOT OPERATE. (Cont) -726250451

TM 9-2320-364-34-1

Middle frame and hook arm have a combined weight 2100 lbs (953 kg). Hook arm cylinders weigh 210

lbs (95 kg) each. Attach suitable lifting device prior to removal or installation to prevent possible injury to

personnel.

Blocks supporting middle frame can fall when middle frame is supported by a lifting device. Have assistant

prevent block from falling or damage to LHS could occur.

OPERATION TEST

(1) Attach lifting device to hook arm.

(2) With the aid of an assistant, lift hook

arm with middle frame until middle

frame pivot pin is above main

cylinder while middle frame safe

lowering button is pushed in

(TM 9-2320-364-10).

(3) Block middle frame up in two places

with wooden blocks.

(4) Remove lifting device from hook

arm.

(5) Attach lifting device to LH main

cylinder.

(6) Attach lifting device to RH main

cylinder.

(7) Remove rod lug end of LH main

cylinder from middle frame

(Para 17-15).

(8) Remove rod lug end of RH main

cylinder from middle frame.

(9) Position LH and RH cylinders using

lifting device so that cylinders can

extend completely.

(10) Start engine.

(11) Put hydraulic selector switch in

MAN MF position.

(12) With the aid of an assistant, hold

joystick in UNLOAD position and

observe main cylinder operation.

(a) If one cylinder does not move,

replace faulty main cylinder and

install other main cylinder.

(b) If both cylinders operate,

fault not corrected. Perform

Steps (13) through (19) below

and notify supervisor.

(13) Position main cylinders and install

rod lug ends to middle frame.

(14) Remove lifting devices from main

cylinders.

(15) Raise hook arm.

(16) Remove wooden blocks from

hook arm.

(17) Put LHS in transit position.

(18) Set hydraulic selector switch to OFF

position.

(19) Turn OFF ENGINE switch.

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