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 446 of 790

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

VEHICLE DOES NOT RESPOND TO DRIVER CONTROLS -- Continued

0019 00

MAIN RELIEF VALVE TEST

Stop engine; relieve hydraulic pressure (if not already done).

Reset all HDC solenoid valves by selecting the RESET VALVES button (Figure 9,

item 5) on the HDC control box.

Disable ejector by manually closing the ejector inhibit ball valve V23 (Figure 10, item 1)

on the DCV bank. Using LINE UP or LINE DOWN button (Figure 9, item 3), select V1

on the HDC display (Figure 9, item 2). Close V1 on the HDC display (Figure 9, item 2)

by selecting the CHANGE POSITION button (Figure 9, 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--3 hydraulic pressure

on the HDC display (Figure 9, item 1).

While holding the EJECTOR CONTROL lever to BACK, have assistant move the

right--hand SUSPENSION CONTROL lever to RAISE. Read transducer T--3 hydraulic

pressure on the HDC display (Figure 9, item 1).

Stop engine; relieve hydraulic pressure.

Enable ejector by manually opening the ejector inhibit ball valve V23 (Figure 10, item 1)

on the DCV bank. Using LINE UP or LINE DOWN button (Figure 9, item 3), select V1

on the HDC display (Figure 9, item 2). Open V1 on the HDC display (Figure 9, item 2)

by selecting the CHANGE POSITION button (Figure 9, item 4) on the HDC control box.

MAIN RELIEF VALVE ADJUSTMENT

Reset all HDC solenoid valves by selecting the RESET VALVES button (Figure 9,

item 5) on the HDC control box.

Continued on page 0019 00--15.

Figure 9. HDC Control Box

Figure 10. DCV Bank

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