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 46 of 790
TM 5--2350--378--24&P
0004 00--21
INTRODUCTION TO TROUBLESHOOTING AND REPAIR OF THE M9 ACE HYDRAULIC
SYSTEM -- Continued
0004 00
RELIEVING HYDRAULIC SYSTEM PRESSURE
1.
If necessary, stop vehicle engine. Place SPRUNG/UNSPRUNG control lever (Figure 17, item 1) in
SPRUNG position.
2.
Relieve pressure from main accumulator by slowly moving SPRUNG/UNSPRUNG control lever
(Figure 17, item 1) toward UNSPRUNG position until a hissing can be heard. Hold in that intermediate
position until hissing ceases, then place SPRUNG/UNSPRUNG control lever (Figure 17, item 1) in SPRUNG
position.
3.
Operate each of the four control levers (Figure 17, item 2) several times, through all positions, to relieve
any residual pressure in hydraulic subsystems.
4.
Slowly loosen hydraulic tank dipstick (Figure 17, item 3) to allow air pressure to escape. Tighten
dipstick (Figure 17, item 3).
Figure 17. Relieving Hydraulic System Pressure
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