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 264 of 790

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

FRONT CORNER (LEFT OR RIGHT) RAISES IN SPRUNG, BUT NOT UNSPRUNG MODE --

Continued

0013 00

Figure 21. HDC Control Box

Figure 22. DCV Bank

Figure 23. Main Relief Valve

MAIN RELIEF VALVE ADJUSTMENT -- CONTINUED

Disable ejector by manually closing the ejector inhibit ball valve V23 (Figure 22, item 1)

on the DCV bank. Using LINE UP or LINE DOWN button (Figure 21, item 3), select V1

on the HDC display (Figure 21, item 2). Close V1 on the HDC display (Figure 21,

item 2) by selecting the CHANGE POSITION button (Figure 21, item 4) on the HDC

control box.

With SPRUNG/UNSPRUNG lever in SPRUNG, have assistant move left hand

SUSPENSION CONTROL lever to RAISE, while at the same time, holding EJECTOR

CONTROL lever in BACK. Observe transducer T--4 hydraulic pressure on the HDC

display (Figure 21, item 1). If pressure is not within limits adjust the main relief valve

13L by loosening jam nut (Figure 23, item 2) and rotating adjustment screw (Figure 23,

item 1) clockwise to increase pressure; counter clockwise to decrease pressure. When

hydraulic pressure is within limits, tighten jam nut (Figure 23, item 2).

Continued on page 0013 00--41.

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