TM-5-2350-378-23-P
ARMORED COMBAT EARTHMOVER (ACE), M9; HYDRAULIC DIAGNOSTIC CENTER
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
JUNE 2012
TM-5-2350-378-23-P - Page 389 of 644
Table
4.
Possible Symptoms Of Failed HDC System Components - Continued.
HDC SYSTEM
POSSIBLE CONSEQUENCES
Solenoid Valve V17 - Shutoff valve - Apron retract
•
No hydraulic fluid supply going to (raise) or from
(lower) apron cylinders.
•
Apron cannot be raised or lowered.
•
Cannot unload or cannot retain load in bowl.
Solenoid Valve V18 - Shutoff valve - No. 4 actuator, left
suspension port 9 to port 2 (normally closed)
STUCK OPEN
SPRUNG MODE:
•
Compensating pressure continuously supplied
to left rear actuators 3 & 4.
UNSPRUNG MODE:
•
Compensating pressure at 2850 psi (19650.06
kPa) continuously supplied to left rear actuators
3 & 4 and right rear actuators 3 & 4. If this is
normal pressure in unsprung mode, there is no
impact.
Solenoid Valve V19 - Shutoff valve - Suspension relief
valve port 17R (normally closed)
STUCK OPEN
SPRUNG MODE:
•
Compensating pump pressure is directed to
reservoir return.
•
No hydraulic fluid supply (9) to wheel valves.
•
No hydraulic fluid supply (9) to actuators.
•
Vehicle will not be raised.
•
Track may be thrown if vehicle is backed.
•
No suspension shock absorbing capability.
UNSPRUNG MODE:
•
Main accumulator/compensating pump
pressure is directed to right front intermediate
control valve.
•
Main accumulator pressure is directed to right
front actuator lower side.
•
No vehicle change in height since raise side
pressure is trapped.
UNSPRUNG MODE-LOWER:
•
No impact.
UNSPRUNG MODE-RAISE:
•
Hydraulic fluid supply is directed to return.
TM 5-2350-378-23&P
0025
0025-31
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