TM-5-2350-378-24-P

HYDRAULIC DIAGNOSTIC CENTER (HDC) SUPPORTING ARMORED COMBAT EARTHMOVER (ACE), M9

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST

TM-5-2350-378-24-P - Page 456 of 790

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

0020 00--5

WINCH AND RIGHT--HAND WHEEL CONTROL INOPERATIVE -- Continued

0020 00

MAIN RELIEF VALVE TEST

WARNING

Before performing any hydraulic troubleshooting in bowl, move

ejector forward, and disable it by disconnecting ejector cylinder

from hydraulic system. Failure to comply may result in severe

injury or death to personnel.

Reset all HDC solenoid valves by selecting the RESET VALVES button (Figure 4,

item 5) on the HDC control box.

Move ejector forward, stop engine, and relieve hydraulic pressure.

Disable ejector by manually closing ejector inhibit ball valve V23 (Figure 3, item 1) on

the DCV bank.

Using LINE UP or LINE DOWN button (Figure 4, item 3), select V1 on the HDC display

(Figure 3, item 2). Close V1 on the HDC display (Figure 4, item 2) by selecting the

CHANGE POSITION button (Figure 4, item 4) on the HDC control box.

Have assistant start engine, move the SPRUNG/UNSPRUNG lever to SPRUNG, and

move EJECTOR CONTROL lever to BACK. Read transducer T--4 hydraulic pressure

on the HDC display (Figure 4, item 1).

While simultaneously holding the EJECTOR CONTROL lever in BACK, have assistant

move left--hand SUSPENSION CONTROL lever to RAISE. Read transducer T--4

hydraulic pressure on the HDC display (Figure 4, item 1).

Using LINE UP or LINE DOWN button (Figure 4, item 3), select V1 on the HDC display

(Figure 4, item 2). Open V1 on the HDC display (Figure 4, item 2) by selecting the

CHANGE POSITION button (Figure 4, item 4) on the HDC control box.

Stop engine; relieve hydraulic pressure.

Figure 3. DCV Bank

Figure 4. HDC Control Box