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 256 of 790

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

0013 00--31

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

Continued

0013 00

Figure 16. HDC Control Box

NO. 1 ACTUATOR PRESSURE TEST (PORT 11)

Reset all HDC solenoid valves by selecting the RESET VALVES button (Figure 16,

item 5) on the HDC control box.

NOTE

This test is performed at No. 1 front actuator which will not raise.

To test RIGHT No. 1 front actuator that will not rise; Using LINE UP or LINE DOWN

button (Figure 16, item 3) on the HDC control box, select V2 on the HDC display

(Figure 16, item 2). Using the CHANGE POSITION button (Figure 16, item 4), close V2

on the HDC display (Figure 16, item 2).

Start engine and move SPRUNG/UNSPRUNG lever to UNSPRUNG. Read transducer

T--11 hydraulic pressure on the HDC display (Figure 16, item 1).

Using LINE UP or LINE DOWN button (Figure 16, item 3) on the HDC control box,

select V2 on the HDC display (Figure 16, item 2). Using the CHANGE POSITION

button (Figure 16, item 4), open V2 on the HDC display (Figure 16, item 2).

To test LEFT No. 1 front actuator that will not rise; Using LINE UP or LINE DOWN

button (Figure 16, item 3) on the HDC control box, select V3 on the HDC display

(Figure 16, item 2). Using the CHANGE POSITION button (Figure 16, item 4), close V3

on the HDC display (Figure 16, item 2).

Move SPRUNG/UNSPRUNG lever to UNSPRUNG. Read transducer T--10 hydraulic

pressure on the HDC display (Figure 16, item 1).

Using LINE UP or LINE DOWN button (Figure 16, item 3) on the HDC control box,

select V3 on the HDC display (Figure 16, item 2). Using the CHANGE POSITION

button (Figure 16, item 4), open V3 on the HDC display (Figure 16, item 2).

Stop engine; relieve hydraulic pressure.