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 420 of 495

TM 9-2350-238-20- 2

APPENDIX F

HYDRAULIC SYSTEM DESCRIPTIO N

AND SCHEMATIC DIAGRAM S

F-1 .

GENERAL.

This appendix contains functional descriptions and schematic diagrams of th e

hydraulic system. The hydraulic system is divided into eight basic subsystems: hydraulic power ,

boom winch, traversing, boom cylinder, tow winch, impact wrench, spade, and suspensio n

lockout .

The M578 Recovery Vehicle has an open-center type hydraulic system. This means that th e

hydraulic fluid continuously circulates through the main hydraulic supply lines. When n o

hydraulic subsystem is being used, the hydraulic fluid pressure in the main supply lines is near

zero. When a subsystem is used, hydraulic fluid from the main supply lines is diverted throug h

the subsystem. Hydraulic fluid pressure builds up within the subsystem to a level high enoug h

for the subsystem to function. Preset pressure relief or pressure reduction valves protect th e

subsystem from too much pressure .

F-2. HYDRAULIC SYMBOLS .

F-1