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 86 of 790
TM 5--2350--378--24&P
0005 00--27
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 V5--Shutoff valve -- right hand
suspension
SPRUNG MODE:
S
No hydraulic fluid return (17).
S
Delay in intermediate valve operation.
S
Delay in raising right front side.
UNSPRUNG MODE--LOWER:
S
No hydraulic fluid supply (17 lower) to intermediate wheel
control valve.
S
No hydraulic fluid supply (17) to right front actuator 1.
S
Inability to completely lower right front side of vehicle.
UNSPRUNG MODE--RAISE:
S
No hydraulic fluid return (17) from right front actuator 1 & 2.
S
Hydraulic fluid will return through (7).
Solenoid Valve V6--Shutoff valve -- No. 3 left
actuator
SPRUNG MODE:
S
No hydraulic fluid supply (9) to left rear intermediate
actuator 3.
S
Rear left of vehicle partially raised.
S
Left rear of vehicle will bottom out.
S
Possible vehicle damage.
S
Partial suspension shock absorbing capability on rear left
side.
UNSPRUNG MODE:
S
No hydraulic fluid supply (9) to left rear intermediate
actuator 3.
S
Rear left of vehicle will only be partially raised.
Solenoid Valve V7--Shutoff valve -- No. 3
actuator, left suspension port 2
SPRUNG MODE:
S
No hydraulic fluid supply (9) to left rear intermediate
actuator 3.
S
Rear left of vehicle partially raised.
S
Left rear of vehicle will bottom out.
S
Partial suspension shock absorbing capability on rear left
side.
UNSPRUNG MODE:
S
No hydraulic fluid supply (9) to left rear intermediate
actuator 3.
S
Rear left of vehicle will only be partially raised.
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