TM-9-2350-238-20-2

CRANE (CAB) COMPONENTS RECOVERY VEHICLE, FULL TRACKED: LIGHT,ARMORED, M578

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL

MAY 1993

CHANGE 1

TM-9-2350-238-20-2 - Page 429 of 495

TM 9-2350-238-20- 2

F-5. BOOM WINCH HYDRAULIC SUBSYSTEM .

Functional Description .

a.

The hydraulic fluid power for th e

d.

Moving the handle of the directiona l

operation of the boom winch is supplied by

control valve (1) in the PAY OUT positio n

the hydraulic power subsystem .

has the same effect as in PAY IN excep t

that the hydraulic fluid is routed in the op-

b.

The boom winch hydraulic subsyste m

posite direction through the hydraulic moto r

controls the power for boom winch opera -

(9). The relief valve (5) controls the rate o f

tion when lifting or lowering a load.

flow in the return line and prevents free fal l

of the load.

c.

Move the handle of the directiona l

e.

When the handle of the directiona l

control valve (1) in the PAY IN position t o

control valve (1) is in the neutral position ,

direct hydraulic fluid to release brake (7)

hydraulic fluid flows through the ope n

and operate the hydraulic motor (9) t o

center port to the tow winch directiona l

retrieve the boom winch wire rope. Retur n

control valve .

fluid from the hydraulic motor (9) flows

through the pressure relief valve (5) an d

f.

When the engine is not operating o r

the directional control valve (1), then to th e

during hydraulic power failure, the boo m

reservoir. The relief valve (4) limits

winch brake can be manually released by

hydraulic pressure when paying in to 142 5

setting the brake release valve (7) to HAND

psi (9825 kPa) to protect the winch com-

PUMP PRESSURE and operating the han d

ponents from overload .

pump to lower a load.

F-1 0