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 244 of 790

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

0013 00--19

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

Continued

0013 00

LEFT AND RIGHT SUSPENSION PORT 17 PRESSURE TEST

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

item 5) on the HDC control box.

NOTE

Perform this test for ports 17R and 17L on the directional control

valve (DCV) bank. Use the right--hand SUSPENSION CONTROL

lever for port 17R and the left--hand SUSPENSION CONTROL

lever for port 17L.

Port 17L: Using LINE UP or LINE DOWN button (Figure 9, item 3), select V11 on the

HDC display (Figure 9, item 2). Close V11 on the HDC display (Figure 9, item 2) by

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

Port 17R: Repeat previous step for port 17R, but close V5 instead of V11.

Start engine and have assistant move SPRUNG/UNSPRUNG lever to UNSPRUNG and

SUSPENSION CONTROL lever to LOWER. Read 17L or 17R circuit pressure from

transducer T--1 hydraulic pressure on the HDC display (Figure 9, item 1).

Port 17L: Using LINE UP or LINE DOWN button (Figure 9, item 3), select V11 on the

HDC display (Figure 9, item 2). Open V11 on the HDC display (Figure 9, item 2) by

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

Port 17R: Repeat previous step for port 17R, but open V5 instead of V11.

Stop engine; relieve hydraulic pressure. Remove all test equipment and connect hose.

Figure 9. HDC Control Box