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 383 of 644
Table
4.
Possible Symptoms Of Failed HDC System Components.
HDC SYSTEM
POSSIBLE CONSEQUENCES
NOTE
•
The probability of a stuck solenoid valve is low and would occur after a hydraulic
maintenance test is performed where a solenoid valve was energized (to change status)
as part of a specific test.
•
Numbers in parentheses (possible consequences) correspond to vehicle hydraulic line
numbers as shown on M9 ACE HDC hydraulic system schematic (FO-1 through FO-3).
Solenoid Valve V-1 - Shutoff valve - ejector control valve
extend
•
Cannot extend ejector cylinder or cannot retract
ejector cylinder.
•
Cannot dump load or cannot retract ejector to fill
load.
•
Cannot fold or unfold apron.
Solenoid Valve V2 - Shutoff valve - No. 1 actuator right
front
SPRUNG MODE:
•
No hydraulic fluid return (11) from right front
wheel valve.
•
Wheel valve stays in unsprung position.
•
No hydraulic fluid supply (9) to right front
actuators 1 & 2.
•
Front right of vehicle will not be raised.
•
Right front of vehicle will drag or bottom out.
•
No suspension shock absorbing capability on
right front side.
UNSPRUNG MODE:
•
No hydraulic fluid supply (11) to right front wheel
valve.
•
Wheel valve stays in sprung position.
•
No hydraulic fluid return (3) connection from
actuators 1 & 2 to DCV.
•
Undesired hydraulic fluid supply (9) to front right
actuators 1 & 2.
•
Right front of vehicle is raised to sprung position.
•
Undesired suspension dampening on right front
side.
UNSPRUNG-LOWER:
•
No hydraulic fluid supply (17) to front right
actuator 1.
•
No hydraulic fluid return (3) from right front
actuators 1 & 2.
•
Front right of vehicle will not be lowered.
TM 5-2350-378-23&P
0025
0025-25
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