TM 5-2350-378-23&P
0021
APPARENT HYDRAULIC DIAGNOSTIC CENTER (HDC) SYSTEM PROBLEM - Continued
STEP
1.
Perform HDC system functional check-out (WP 0025).
CONDITION/INDICATION
Can HDC system functional check-out be performed successfully?
DECISION
YES - HDC system appears to be functioning properly and ready to aid in troubleshooting the M9 ACE hydraulic
system. If this functional checkout was performed as part of weekly HDC system PMCS (WP 0023), power off
HDC system, disconnect it from vehicle, and stow HDC control box and umbilical cable W4. If this functional
checkout was performed prior to troubleshooting a problem in vehicle hydraulic system using HDC system, refer
to applicable problem symptom work package as applicable and proceed as indicated (WP 0005).
NO - Go to Step (2).
STEP
2.
Check installation of HDC control box and umbilical cable W4. Check for clean and secure HDC system ground
connection in vehicle (Figures 1, 2, and 3).
W3J1
W2J1
W4P6
W1J1
UMBILICAL CABLE
DISCONNECT
PANEL
W4P4
UMBILICAL CABLE
W4P5
ASSEMBLY W4
T01901HDC
Figure 1.
Umbilical Cable Assembly W4 Connection to Umbilical Cable Disconnect Bracket.
