TM-9-2350-238-20-1

HULL AND RELATED COMPONENTS RECOVERY VEHICLE, FULL TRACKED: LIGHT, ARMORED, M578

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL

MAY 1994

TM-9-2350-238-20-1 - Page 1294 of 1364

TM 9-2350-238-20-1

F-15. BOOM CYLINDER HYDRAULIC SUBSYSTEM.

functional Description.

a.

The hydraulic fluid power for the

d.

Moving the handle of the directional

operation of the boom cylinders is supplied

control valve ( 1 ) in the LOWER position

by the hydraulic power subsystem.

directs hydraulic fluid to the retract ports of

the boom cylinders (4), which

lowers the

b.

The boom cylinder hydraulic sub-

boom. The relief valve (6) protects the sub-

system controls the power to raise and

system from overpressure. Hydraulic

lower the boom.

pressure passing through the flow control

valve (2) causes the relief valve (5) to open

c.

Moving the handle of the directional

and allow return flow to the reservoir.

control valve ( 1 ) in the RAISE position

directs hydraulic fluid through the bypass

e.

When the handle of the directional

check valve of the relief valve (5) to the

control valve (1) is in the neutral position,

extend ports of the boom cylinders (4),

hydraulic fluid is blocked, hydraulically lock-

which raises the boom. The relief valve (6)

ing the boom cylinders in a fixed position.

releases excess hydraulic fluid pressure

The emergency release valve (7) can be

over 2150 psi (14,824 kPa) to return to

opened to lower the boom.

the reservoir.

F-30