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 387 of 644
Table
4.
Possible Symptoms Of Failed HDC System Components - Continued.
HDC SYSTEM
POSSIBLE CONSEQUENCES
•
No hydraulic fluid return (11) from left side
spring stop cylinder (extend).
•
Left front wheel road arm upper travel not
limited.
•
Suspension can bottom out.
•
Track may be thrown if vehicle is backed.
UNSPRUNG MODE:
•
No hydraulic fluid supply (11) to left side stop
cylinder (retract).
•
Left front wheel road arm upper travel limited.
•
Left front of vehicle cannot be lowered to doze
or scrape.
Solenoid Valve V10 - Shutoff valve - Front right bump
stop extend
SPRUNG MODE:
•
No hydraulic fluid return (11) from right side
spring stop cylinder (extend).
•
Right front wheel road arm upper travel not
limited.
•
Suspension can bottom out.
•
Track may be thrown if vehicle is backed.
UNSPRUNG MODE:
•
No hydraulic fluid return (11) to right side stop
cylinder (retract).
•
Right front wheel road upper arm travel limited.
•
Right front of vehicle cannot be lowered to doze
or scrape.
Solenoid Valve V11 - Shutoff valve - Left hand
suspension lower
SPRUNG MODE:
•
No impact.
UNSPRUNG MODE-LOWER:
•
No hydraulic fluid supply (17 lower) to
intermediate wheel control valve.
•
No hydraulic fluid supply (17) to left front
actuator 1.
•
Inability to completely lower left front side of
vehicle.
•
Degraded dozing and scraping.
UNSPRUNG MODE-RAISE:
•
No hydraulic fluid supply (17) from left front
actuators 1 & 2.
•
Hydraulic fluid will return through (7).
TM 5-2350-378-23&P
0025
0025-29
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