TM-5-2350-378-24-P

TM-5-2350-378-24-P - Page 29 of 790

TM 5--2350--378--24&P

0004 00--4

INTRODUCTION TO TROUBLESHOOTING AND REPAIR OF THE M9 ACE HYDRAULIC

SYSTEM -- Continued

0004 00

HYDRAULIC SYSTEM PRINCIPLES OF OPERATION

This portion of the work package contains information relative to the principles of hydraulic system operation for

the M9, ACE. The general functional description of the vehicle and separate systems are contained in TM

5--2350--262--20--1. Unit maintenance personnel should be familiar with the principles of operation of these

systems before working on or troubleshooting hydraulic systems. A more thorough understanding of the hydraulic

system and electrical system can be obtained by referring to the vehicle wiring diagram in TM 5--2350--262--20--1

and the vehicle hydraulic schematic in this manual.

HYDRAULIC SYSTEM

The hydraulic system provides hydraulic pressure to energize the suspension system, operate the winch, ejector

and apron cylinders, and bilge pump. Some hydraulic components are briefly described below.

Hydraulic Return Line Filter

This filter, located behind the bowl area, on top of the engine, filters out contaminants from the hydraulic oil

returning to the hydraulic reservoir.

Main Hydraulic Accumulator

The main hydraulic accumulator is located on the left side of the filter support. It is charged with nitrogen to

1,750--1,850 psi (12,066--12,756 kPa) at 70

F(21

C) and provides immediate response to temporary needs of

the SPRUNG mode that the compensating pump cannot meet. A charge and gauge assembly is mounted on the

accumulator and is used to check accumulator charge status and to charge the accumulator.

Figure 5. Main Hydraulic Accumulator