Posted by Janicholson on January 30, 2010 at 10:57:28 from (64.61.211.127):
In Reply to: hydraulic? posted by dan mcdonald on January 30, 2010 at 06:46:44:
There are vented and non vented systems. In systems that have large capacity there is almost always a vent, in self contained systems with no remotes, there may not be. One way cylinders, with no hose on the non pressure end, and a vent, or atmospheric port, draw their extend volume from the reservoir. This volume is substantial, and would lead to a vacuum in the system, and cavitation in the pump if allowed to happen with no reservoir vent. Generally all one way cylinder systems need vents unless the non pressure end of the cylinder is plumbed into the reservoir, acting as additional volume, and returning fluid to the res as it is being pumped out to the pressure side. The ram of the cylinder takes up volume in the system, so there is somewhat less returning than is sent. In a large complex system this differential in volume can be a problem if all cylinders are extended at the same time. Venting is good but it also provides the primary route for moisture to get into the system. A vent filter with a desiccant is probably best. Systems that routinely operate at full temperature under load heat the water out of the oil. Systems that are worked only lightly will need the fluid changes as it becomes milky. Heating the fluid can drive out the moisture, but care must be taken to prevent flash fires. JimN
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 - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
... [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.