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 457 of 495

TM 9-2350-238-20- 2

F-19. TOW WINCH HYDRAULIC SUBSYSTEM .

Functional Description .

a.

The hydraulic fluid power for th e

operation of the tow winch is supplied by

the hydraulic power subsystem .

b.

The tow winch hydraulic subsyste m

controls the power for tow winch operatio n

when pulling or releasing a load.

c .

Moving the handle of the directiona l

control valve (1) in the PAY IN positio n

directs hydraulic fluid to release brake (7)

and operate the hydraulic motor (8) t o

retrieve the tow winch wire rope. Retur n

fluid from the hydraulic motor (8) flows

through the pressure relief valve (10) an d

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

reservoir. The relief valve (4) limits hydrau-

lic pressure when paying in to 2150 ps i

(14,824 kPa) to protect winch component s

from overload .

d.

Moving the handle of the directiona l

control valve (1) in PAY OUT position has

the same effect as in PAY IN except tha t

the hydraulic fluid is routed in the opposit e

direction through the hydraulic motor (8) .

The relief valve (10) controls the rate o f

flow in the return line .

e.

When the handle of the directiona l

control valve (1) is in the neutral position ,

hydraulic fluid from both 40 gpm hydrauli c

pumps flows through the open center por t

to the reservoir .

f.

If the boom winch is used at th e

same time that the tow winch is bein g

used, the tow winch operation will b e

slowed down in proportion to boom winc h

use .

F-3 8