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 36 of 790
TM 5--2350--378--24&P
0004 00--11
INTRODUCTION TO TROUBLESHOOTING AND REPAIR OF THE M9 ACE HYDRAULIC
SYSTEM -- Continued
0004 00
The following information is provided to familiarize personnel with the various types of hydraulic fittings. Refer to
this work package and the warning and cautions on the previous pages when working on hydraulic systems.
1.
National Pipe Thread (NPT) is commonly found in hydraulic systems. It differs from other fittings because it
is tapered. In order to obtain a proper seal with this thread, you must use a sealant. The sealant should be
applied to the male fitting. Torque valve guide is NOT to be used.
CAUTION
Do not apply sealant to the leading edge or the first thread of hydraulic fitting, or
sealant may get into the hydraulic system and contaminate it. Failure to comply may
result in damage to equipment.
Figure 9. National Pipe Thread (NPT) Fittings
2.
The 37
_
flare termination has a male straight thread that mates with a female straight thread. The sealing
surface for this termination is the angled nose at the end of the male fitting. This nose mates with a similar
surface in the female 37
_
flare fitting. These sealing surfaces must be free of nicks and scratches in order to
seal properly. If nicked or scratched, item must be replaced. For torque requirements, see guide in
appendix.
Figure 10. 37
_
Flare Termination Fitting
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