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 87 of 790
TM 5--2350--378--24&P
0005 00--28
USING THE HYDRAULIC DIAGNOSTIC CENTER (HDC) SYSTEM TO TROUBLESHOOT
THE M9 HYDRAULIC SYSTEM -- Continued
0005 00
Table 5. POSSIBLE SYMPTOMS OF FAILED HDC SYSTEM COMPONENTS -- Continued
HDC SYSTEM
POSSIBLE CONSEQUENCES
Solenoid Valve V8--Shutoff valve -- No. 4 left
actuator
SPRUNG MODE:
S
No hydraulic fluid return (11) from left rear wheel valve.
S
Wheel valve in unsprung position.
S
No suspension shock absorbing capability on rear left side.
UNSPRUNG MODE:
S
No hydraulic fluid supply (11) to left rear wheel valve.
S
Wheel valve in sprung position.
S
Undesired suspension shock absorbing capability on rear
left side.
S
Right rear actuators maintain position or lower.
S
Rear actuators maintain sprung position.
Solenoid Valve V9--Shutoff valve -- Front left
bump stop extend
SPRUNG MODE:
S
No hydraulic fluid return (11) from left side spring stop
cylinder (extend).
S
Left front wheel road arm upper travel not limited.
S
Suspension can bottom out.
S
Track may be thrown if vehicle is backed.
UNSPRUNG MODE:
S
No hydraulic fluid supply (11) to left side stop cylinder
(retract).
S
Left front wheel road arm upper travel limited.
S
Left front of vehicle cannot be lowered to doze or scrape.
Solenoid Valve V10--Shutoff valve -- Front right
bump stop extend
SPRUNG MODE:
S
No hydraulic fluid return (11) from right side spring stop
cylinder (extend).
S
Right front wheel road arm upper travel not limited.
S
Suspension can bottom out.
S
Track may be thrown if vehicle is backed.
UNSPRUNG MODE:
S
No hydraulic fluid return (11) to right side stop cylinder
(retract).
S
Right front wheel road arm upper travel limited.
S
Right front of vehicle cannot be lowered to doze or scrape.
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