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 426 of 790

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

0018 00--13

REAR OF VEHICLE RAISES IN SPRUNG, BUT NOT UNSPRUNG MODE -- Continued

0018 00

Figure 7. HDC Control Box

SPRUNG/UNSPRUNG CONTROL VALVE OPERATION TEST

Reset all HDC solenoid valves by selecting the RESET VALVES button (Figure 7,

item 2) on the HDC control box.

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

and UNSPRUNG several times. Observe transducer T--12 hydraulic pressure on the

HDC display (Figure 7, item 1). Hydraulic pressure should be less than 145 psi (1,000

kPa) in SPRUNG mode and greater than 2,500 psi (17,238 kPa) in UNSPRUNG mode.

Stop engine; relieve hydraulic pressure.