Appendix F: HYDRAULIC SYSTEM DESCRIPTION AND SCHEMATIC DIAGRAMS

TM 9-2350-238-20-1

APPENDIX F

HYDRAULIC SYSTEM DESCRIPTION

AND SCHEMATIC DIAGRAMS

F-1. GENERAL. This appendix contains functional descriptions and schematic diagrams of the

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

boom winch, traversing, boom cylinder, tow winch, impact wrench, spade, and suspension

lockout.

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

hydraulic fluid continuously circulates through the main hydraulic supply lines. When no

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 through

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

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

subsystem from too much pressure.

F-2. HYDRAULIC SYMBOLS.

F-1