Tractor Talk Discussion Board |
Re: Snowplow truck hydr. problem
[ Expand ] [ View Replies ] [ Add a Reply ] [ Return to Forum ]
Posted by jdemaris on December 07, 2006 at 06:08:00 from (69.67.230.233):
In Reply to: Snowplow truck hydr. problem posted by Roy Suomi on December 06, 2006 at 16:46:41:
What Mr.Schwiebert stated is correct. Regardless if the gear pump is a Webster Electric, Cessna, Parker, etc. - the external shaft seal is not intended to seal against pressure oil - only residual. And - with all the Parker gear pumps, I don't believe they ever made one rated at lower than 2500 PSI contant duty - and most commercial rated pumps are rated at 4000 PSI or more - constant duty. Anytime a gear pump starts pushing out the seal - it is an indicator of #1 a worn out pump, or #2 the working pressure exceeds the rated PSI limit. Both situations are, more-or-less, the same - since a when a pump wears, it's working PSI limit decreases. The high pressure sealing is supposed to be done by the smooth face of the gear against the pump housing or thrust plate. On some model pumps, there is a replaceable thrust plate sealed by o-rings or a spider gasket - and on other pumps - nothing is replaceable. So, it possible to exceed the rated pressure and blow a gasket - which can be fixed. It's also common for the pump to get scored, bushings wear, etc. - and the pump is unrepairable junk. Some Parker gear pumps have internal pressure relief valves.
Replies:
Home
| Forums
Today's Featured Article -
Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
... [Read Article]
Latest Ad:
Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
[More Ads]
Copyright © 1997-2024 Yesterday's Tractor Co. 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. Yesterday's Tractors - Antique Tractor HeadquartersWebsite Accessibility Policy |
|