TM-5-2350-378-24-P

TM-5-2350-378-24-P - Page 22 of 790

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

THEORY OF OPERATION

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SCOPE

This section contains information relative to the principles of operation for the Hydraulic Diagnostic Center (HDC).

The general functional description of the HDC is contained in this section. Unit maintenance personnel should be

familiar with the principals of operation of this system before working on or troubleshooting the hydraulic system.

A more thorough understanding of the hydraulic system and electrical system/HDC integration may be obtained

by referring to the interconnecting wiring diagram (FP--17) and the HDC hydraulic schematic (FP--6).

Components:

HYDRAULIC DIAGNOSTIC CENTER

This component analyzes and diagnoses problems within the ACE vehicle’s hydraulic system. Connected to

valves and transducers on manifolds and at components by wiring harness W4, it sends messages to the LED

screen concerning problems it encounters within the hydraulic system. The HDC is stowed in the driver’s

compartment.

LCD SCREEN

This screen is used to input commands to the unit itself, and displays alerts and diagnoses as they become avail-

able.

SOLENOID VALVES

The HDC uses twenty electronically--controlled solenoids, as well as three manual valves.

TRANSDUCERS

Thirteen transducers are installed into the hydraulic lines at critical points and remain there. Connected to the

HDC system, they aid in diagnosing any problems the M9 ACE may be having with the hydraulic system.

WIRING HARNESSES

Four wiring harnesses connect the components of the HDS system to the vehicle’s hydraulic system. When not in

use, harness W4 is stowed in the driver’s compartment.

END OF WORK PACKAGE

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