Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Attention Forum Users: On the 28th of December 2023 at 9:00am Central Time, we will be taking the forums down for maintenance while we prepare the new forums for your use. Please click here for more information.

Discussion Forum
:

JD models with closed center hydraulics

Welcome Guest, Log in or Register
Author 
Bill Grimley

11-11-1999 16:33:23




Report to Moderator

Can someone explain the difference between open center hydraulics and closed center hydraulics? I think I have heard that closed center is more advantageous for operating a loader, etc. - - -is that so? What older model John Deeres 50 horsepower or less have closed center? Thanks!




[Log in to Reply]   [No Email]
Mike H

11-11-1999 18:22:13




Report to Moderator
 Re: JD models with closed center hydraulics in reply to Bill Grimley, 11-11-1999 16:33:23  
Open center pumps gallons of oil all the time at low or no pressure until you pull a lever.Closed center maintanes max. pressure with little or no flow until you pull a lever. Clear as mud? I see very little need for the small advantage of closed C.The 2010,3010,2020,4010,4020



[Log in to Reply]  [No Email]
2010 is open center-among many other faults

11-12-1999 06:36:03




Report to Moderator
 Re: Re: JD models with closed center hydraulics in reply to Mike H, 11-11-1999 18:22:13  
That's my message.



[Log in to Reply]  [No Email]
Steve

11-11-1999 19:21:41




Report to Moderator
 Re: Re: JD models with closed center hydraulics in reply to Mike H, 11-11-1999 18:22:13  
Closed center has a big advantage in power savings and prevention of heat in the hyd. system.



[Log in to Reply]  [No Email]
Mike H

11-11-1999 19:52:27




Report to Moderator
 Re: Re: Re: JD models with closed center hydraulics in reply to Steve, 11-11-1999 19:21:41  
I disagree with Steve because on a JD it takes power to maintan the rated 2300psi standby pressure of a 4020, even with no flow!! And it seems funny about the heat question all of these tractors with closed hyd. have a OIL COLLER in front of the radaitor!!I have spent many hours with a flowrater hooked to these tractors trying to locate the monmentary loss of hyd.that occur from time to time and have found it!

[Log in to Reply]  [No Email]
Charlie

11-12-1999 05:28:20




Report to Moderator
 Re: Re: Re: Re: JD models with closed center hydraulics in reply to Mike H, 11-11-1999 19:52:27  
Why does it take power to maintain the pressure if there are no leaks? It seems that it would be like pumping up a tire that after it reaches some pressure it keeps it with no more work. Not the same thing?



[Log in to Reply]  [No Email]
Mike H

11-12-1999 20:01:56




Report to Moderator
 Re: Re: Re: Re: Re: JD models with closed center hydraulics in reply to Charlie, 11-12-1999 05:28:20  
I'll try to explain the JD C.C. hyd.pump there is a center shaft with a essentric cam on it with pistons surrounding this and with no pressure to start out the pistons follow the essentric cam and as pressure builds the pistons start to lift off the cam until the pressure is meet then they touch lightly to overcome the internal leakage and to fill any demand.(these pumps have no internal piston seals, so this is a built in leak ) this I described is more commonly known as going into stroke or destroking so to maintan the 2300 psi it has to pump under high pressure constantly hence power is used and heat is built up.Thats why a 4020 has that chattering sound when it's idling.I stand corrected on the 2010 there aren't very many of 2010's or 1010's in this area.

[Log in to Reply]  [No Email]
Gerald J.

11-12-1999 08:50:14




Report to Moderator
 Re: Re: Re: Re: Re: JD models with closed center hydraulics in reply to Charlie, 11-12-1999 05:28:20  
There are always leaks, especially the pump itself.

Gerald J.



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
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 ]

Home  |  Forums


Copyright © 1997-2023 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 Headquarters

Website Accessibility Policy