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 471 of 495

TM 9-2350-238-20- 2

F-28. SUSPENSION LOCKOUT HYDRAULIC SUBSYSTEM .

Functional Description .

a .

The suspension lockout hydrauli c

one side of the cylinder piston to the other .

subsystem forms a hydrostatic lock withi n

The pressure switch (8) is closed whe n

each lockout cylinder (3). This stops up an d

pressure in the lockout cylinder is over 12 0

down movement of the road wheels an d

psi (827 kPa), lighting the SUSPENSION

provides a solid hoisting platform .

LOCKED indicator lights. When the hydrau-

lic pressure drops below 95 psi (655 kPa) ,

b.

Lockout cylinders (3) are locked b y

the pressure switch (8) opens, putting ou t

setting the selector control valve (5) t o

the SUSPENSION LOCKED indicator lights .

LOCKED. Hydraulic fluid at 1600 to 240 0

psi (11,032 to 16,548 kPa) flows throug h

c.

The subsystem is protected fro m

the valve (5) to the valve (6). The valve (6)

overpressure by the relief valve (2), whic h

reduces the fluid pressure to 150 psi (103 4

bypasses fluid over 240 psi (1655 kPa)

kPa). As the fluid pressure builds up in th e

back to the reservoir. The cylinders (3) ar e

lockout cylinders (3), the lockout pistons

unlocked by setting the valve (5) t o

are forced into the lockout position. This

UNLOCKED. This allows the hydraulic flui d

prevents hydraulic fluid from passing fro m

to flow back to the reservoir .

F-5 2