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 62 of 790
TM 5--2350--378--24&P
0005 00--3
USING THE HYDRAULIC DIAGNOSTIC CENTER (HDC) SYSTEM TO TROUBLESHOOT
THE M9 HYDRAULIC SYSTEM -- Continued
0005 00
NOTE
Problems existing in the vehicle hydraulic system when the HDC System Functional
Check--Out is performed could result in the HDC System not passing all portions of
the Functional Check--Out. Because of this, it is important that all applicable vehicle
PMCS checks have been performed and that vehicle hydraulic functions be exercised
prior to performing the HDC System Functional Check--Out to determine exactly
which vehicle hydraulic functions are impaired and to use this information with the
results of the Functional Check--Out to help isolate the problem area.
Figure 1. DCV Bank
1.
Exercise vehicle functions:
a. Confirm that the three HDC System manual valves V21 (Figure 1, item 1), V22 (Figure 1, item 2), and
V23 (Figure 1, item 3) are in the fully OPEN position. Handles must be vertical.
b. Start engine.
c.
Confirm that vehicle rises up and levels out normally when the engine is started within two minutes.
d. Confirm that ejector extends and retracts.
e. Confirm that apron moves up and down.
f.
Confirm that left suspension moves up and down.
g. Confirm that right suspension moves up and down.
h. Confirm that the left and right bump stops extend when the vehicle is placed in SPRUNG mode, and
retract when the vehicle is placed in UNSPRUNG mode.
i.
Confirm that winch pays out and pays in.
2.
Valve V23 check:
a. Stop engine.
b. Manually place valve V23 in the closed position. Handle horizontal (down).
c.
Start engine.
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