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 246 of 790

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

0013 00--21

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

Continued

0013 00

SOLENOID VALVE V11 OR V5 CHECK

Reset all HDC solenoid valves by selecting the RESET VALVES button (Figure 10,

item 5) on the HDC control box.

Using LINE UP or LINE DOWN button (Figure 10, item 3), select V1 on the HDC display

(Figure 10, item 2). Close V1 on the HDC display (Figure 10, item 2) by selecting the

CHANGE POSITION button (Figure 10, item 4) on the HDC control box.

Verify that transducer T--1 hydraulic pressure on the HDC display (Figure 10, item 1),

reads less than 500 psi (3447.379 kPa).

Have assistant start engine and place the vehicle in UNSPRUNG mode.

For solenoid valve V11 (circuit 17L): Have assistant move the left SUSPENSION

CONTROL lever to LOWER.

Verify that transducer T--1 hydraulic pressure on the HDC display (Figure 10, item 1),

reads greater than 3,000 psi (20684.27 kPa). (This indicates that V11 has directed flow

from the suspension to transducer T1, which now reads the system relief valve pressure

setting.) If pressure is 3,000 psi (20684.27 kPa) or more, solenoid valve V11 on primary

manifold, is bad.

For solenoid valve V5 (circuit 17R): Have assistant move the right SUSPENSION

CONTROL lever to LOWER.

Verify that transducer T--1 hydraulic pressure on the HDC display (Figure 10, item 1),

reads greater than 3,000 psi (20684.27 kPa). (This indicates that V5 has directed flow

from the suspension to transducer T1, which now reads the system relief valve pressure

setting.) If pressure is 3,000 psi (20684.27 kPa) or more, solenoid valve V11 on primary

manifold, is bad.

Stop engine; relieve hydraulic pressure.

Figure 10. HDC Control Box