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 358 of 790

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

HYDRAULIC OIL OVERHEATS -- Continued

0016 00

EJECTOR CYLINDER INTERNAL LEAKAGE TEST

Reset all HDC solenoid valves by selecting the RESET VALVES button (Figure 41,

item 4) on the HDC control box.

Using LINE UP or LINE DOWN button (Figure 41, item 2), select V1 on the HDC display

(Figure 41, item 1). Close V1 on the HDC display (Figure 41, item 1) by selecting the

CHANGE POSITION button (Figure 41, item 3) on the HDC control box.

Start engine and have assistant hold EJECTOR CONTROL lever in the BACK position

for one minute. Mark position of ejector at side of hull and continue to hold valve lever in

the BACK position for one more minute. Check position of ejector while still holding

valve lever in the BACK position.

If ejector has moved forward more than 1/2 in (12mm), the ejector cylinder is leaking

excessively. If the ejector has moved aft more than 1/2 in (12mm), solenoid valve V1 on

the HDC primary manifold is leaking.

Reset all HDC solenoid valves by selecting the RESET VALVES button (Figure 41,

item 4) on the HDC control box.

Figure 41. HDC Control Box

APRON RELIEF VALVE PRESSURE TEST

Reset all HDC solenoid valves by selecting the RESET VALVES button (Figure 41,

item 4) on the HDC control box.

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