There are no "tricks" to getting hydraulic NPT fittings to seal, unless you are dealing with "black pipe" style NPT fittings, such as straight connectors, bushing, couplings, etc, as most of these don't have the taper incorporated in them. In these cases a sealant such as pipe dope must be used. These type of NPT connections are not leakproof without pipe dope. As you had said, the seal on other hydraulic NPT fitting is on the taper. Both male and female must be "hydraulic" NPT with the tapers. If one fitting is standard "black pipe" NPT, they won't seal no matter what, as a lot of these don't have the proper taper. Obviously "black pipe" NPT should not be used on the high pressure side of hydraulics, as they are not rated for the pressure. As you mentioned, once the fitting stops swiveling, (unless a "live" swivel), the connection is tight and should not leak.
You mention:
Quoting Removed, click Modern View to see
A typical connection on a hydraulic NPT swivel 90 or straight, is a hydraulic hose male npt to the female NPT fitting. In this case the male NPT hose has the "chamfer" and the female fitting has the "cone". If this is what you have, and they leak, one part or the other is faulty.
Note that some "older" NPT hydraulic hoses, are "black pipe" style, that is no chamfer. As said previously those won't seal no matter what.
Upload one or more videos to your post. Photo and video filesizes should be less than 8MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
