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 37 of 790
TM 5--2350--378--24&P
0004 00--12
INTRODUCTION TO TROUBLESHOOTING AND REPAIR OF THE M9 ACE HYDRAULIC
SYSTEM -- Continued
0004 00
3.
An O--ring (preformed packing) boss has a straight thread. The seal for this termination is a preformed
packing that fits at the top of the threads on the male fitting. This packing is squeezed into the extra space at
the top of the threads of the female fitting and seals the connection. The installed packing must be free of
nicks and cuts to seal properly. If packing is nicked or cut, it must be replaced.
CAUTION
Packing must be located fully into groove and not on threads. Failure to comply may
result in damage to equipment.
Figure 11. O--Ring (Packing) Boss
4.
A flareless fitting uses a straight thread. The female fitting contains a ferrule that mates with a cavity in the
male fitting. Use recommended torque values to tighten nut (TM 5--2350--262--20--2). If this fitting is
overtorqued, the ferrule will be deformed and the fitting will leak.
Figure 12. Flareless Fitting
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