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 423 of 495

TM 9-2350-238-20- 2

F-3. HYDRAULIC POWER SUBSYSTEM .

Functional Description .

a .

Hydraulic reservoir (19) is filled wit h

hydraulic fluid .

b.

When engine (13) is running an d

magnetic clutch (15) is energized, hydraulic

fluid from hydraulic reservoir (19) is draw n

through filter (21) and slip ring (1) by

hydraulic pumps (16, 17, and 18) .

c.

The hydraulic pump (16) supplie s

hydraulic fluid at 40 gallons per minut e

(152 liters per minute) through the flow

divider manifold for distribution to th e

boom winch subsystem .

d.

The hydraulic pump (17) supplie s

hydraulic fluid at 40 gallons per minut e

(152 liters per minute) to the flow divider

valve (3), which distributes the fluid flow

between the traversing subsystem and th e

boom cylinder subsystem. When the tra -

versing subsystem is not being used, un-

used fluid is directed back to the flow

divider manifold for use by the boom cylin-

der subsystem as needed .

e .

The relief valve (7) has two pressur e

settings. Only the high pressure setting ca n

be externally adjusted by the pressure ad-

justment setscrew. The valve is normally i n

the low pressure setting position, shiftin g

to the high pressure setting when th e

solenoid is energized by the closing of on e

of the tow winch level wind switches .

f.

The hydraulic pump (18) pump s

hydraulic fluid at 8 gallons per minute (3 0

liters per minute) through the filter (12) an d

relief valves (8 and 9). The relief valve (8)

allows the hydraulic pressure to build up t o

1850 psi (12,756 kPa) for operation of th e

impact wrench, spade, and suspensio n

lockout cylinders. The relief valve (9) is a

solenoid operated dual setting type relie f

valve. Normally, the relief valve is

deenergized. When deenergized, the relie f

valve (9) keeps the pressure in the supply

lines to the level wind solenoid valves a t

135 psi (931 kPa). During level win d

traversing, the relief valve (9) is energize d

by the tow winch cable sensing switches .

When energized, the relief valve (9) in-

creases pressure to 1750 psi (12,066 kPa)

to drive the cab traversing hydraulic motor .

g .

The handpump (10) provide s

hydraulic fluid pressure for emergency

manual release of the boom winch, to w

winch, and traversing motor brakes and for

emergency manual raising of the spade .

F- 4