TM 5-2350-378-23&P
0002
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES
The HDC (Figure 1) is used to aid in troubleshooting the M9 ACE's hydraulic system and components. The HDC
consists of a control box with a display screen, 20 electrically controlled solenoid valves, three manually controlled
valves, and 13 transducers. Four wiring harnesses connect the HDC to the vehicle's hydraulic system's test points
(installed prior to use of the HDC, and left in place on the vehicle) and the LED screen. Each of the 20 electronically-
controlled valves (V1 through V20) return to their normal operating positions when the HDC control box is shut off
or power is disconnected for any other reason. Valves V1 through V20 can be opened and closed by using the LINE
UP and LINE DOWN buttons on the display screen to select a valve, then pressing the CHANGE POSITION button
to open or close the valve. The control box software allows up to four of the solenoid valves to be powered ON at
one time. Pressing the RESET VALVES button returns all valves to their normal vehicle operating position
(power OFF).
G0001HDC
Figure 1. Hydraulic Diagnostic Center (HDC) Control Box.
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