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 85 of 790
TM 5--2350--378--24&P
0005 00--26
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 V3--Shutoff valve -- No. 1
actuator left front
SPRUNG MODE:
S
No hydraulic fluid return (11) from left front wheel valve.
S
Wheel valve stays in unsprung position.
S
No hydraulic fluid supply (9) to left front actuators 1 & 2.
S
Front left of vehicle will not be raised.
S
No suspension shock absorbing capability on left front side.
UNSPRUNG MODE:
S
No hydraulic fluid supply (11) to left front wheel valve.
S
Wheel valve stays in sprung position.
S
No hydraulic fluid return (3) connection from actuators 1 & 2
to DCV.
S
Undesired hydraulic fluid supply (9) to front left actuators 1
&2.
S
Left front of vehicle is raised to sprung position.
S
Undesired suspension dampening on left front side.
UNSPRUNG--LOWER:
S
No hydraulic fluid supply (17) to front left actuator 1.
S
No hydraulic fluid return (3) from left front actuators 1 & 2.
S
Front left of vehicle will not be lowered.
UNSPRUNG--RAISE:
S
No hydraulic fluid supply (3) to left front actuators 1 & 2.
S
No hydraulic fluid return (17) from left front actuators 1 & 2.
S
Front left of vehicle cannot be raised but is already in
sprung/raised position.
Solenoid Valve V4--Shutoff valve -- No. 4 left
actuator port 9
SPRUNG MODE:
S
No hydraulic fluid supply (9) to left rear wheel valve.
S
Wheel valve in unsprung position.
S
No hydraulic fluid supply (9) to left rear actuators 3 & 4.
S
Rear left of vehicle will not be raised.
S
Left rear of vehicle will drag or bottom out.
S
No suspension shock absorbing capability on rear left side.
UNSPRUNG MODE:
S
No hydraulic fluid supply (9) to left and right rear wheel
valves.
S
No hydraulic fluid supply to left actuators 3 & 4 and right
actuators 3 & 4.
S
Rear of vehicle will not be raised.
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