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.

John Deere Tractors Discussion Forum
:

4020d Hydraulics

Welcome Guest, Log in or Register
Author 
B Mance

07-23-2005 11:06:46




Report to Moderator

Just purchased 4020 PS. After about 2hrs of use and you bring engine back to idle the hydraulic pressure is low. (very little power steering and batwing cyls. chatter on the way up) No problem with engine RPM in working range, even when hot. Transmission works fine all the time. Any suggestions appreciated.




[Log in to Reply]   [No Email]
donmyeil

07-25-2005 09:04:35




Report to Moderator
 Re: 4020d Hydraulics in reply to B Mance, 07-23-2005 11:06:46  
The first thing I would do is check the hyd pressures and the transmission pressure,then 3-point cable adjustment. If this is wrong the 3-point might be trying to raise when it is all the way up causing the oil to heat up.Then feel the steering valve , the remote valves , the rockshaft valves for heating as the tractor warms up. (simply letting the 3-point down will test rockshaft linkage and relief valve) If one of these starts to heat more than the others that could be an internal leak. Then it takes more serious testing from there. The 3-point hitch has a relief valve as well as the remote valves and they could cause the oil to heat. You can eliminate some systems by plugging them off to see if this corrects anything ( remote valves, steering , and rockshaft valves. ) Then a hyd flow meter test would be next to check the transmission pump output. I would remove the trans. oil filter relief valve to see if it is stuck open. By the way normal trans.hydraulic oil temp is 100* above outside temp.1969 and newer have the hydraulic engaged pto clutch. If this valve linkage is not adjusted correctly this will heat the oil very quickly.

[Log in to Reply]  [No Email]
Nylon

07-23-2005 22:52:02




Report to Moderator
 Re: 4020d Hydraulics in reply to B Mance, 07-23-2005 11:06:46  
I have been learning a bit about 4020s myself. I have a 4020 diesel 68 synchro. Ther is another well versed person who used to post here who explained the problems with a check valve. There is a transfer pump that fills the forward reserve tank / cooler. The big problem is trying to run hydraulics right after start up. chattering and such. After it has run a bit that forward reserve is filled and no problem.

The check valve keeps fluid up front. If that check valve is completely fried it may loose enough oil that only higher rpms maintains the system. Strictly hypothetical on my part but you can do a search for 4020 hydraulics and you should find some posts relating to it.

John

[Log in to Reply]  [No Email]
Tx Jim

07-23-2005 13:47:36




Report to Moderator
 Re: 4020d Hydraulics in reply to B Mance, 07-23-2005 11:06:46  
I suggest changing both hyd. filters and cleaning sump screen. If lose of pressure continues you probably have an internal hyd. leak. Tx Jim



[Log in to Reply]  [No Email]
masterwelder

07-23-2005 12:29:08




Report to Moderator
 Re: 4020d Hydraulics in reply to B Mance, 07-23-2005 11:06:46  
My '68 4020d ps dose the same thing. My friend has a 71 4020d sincro and has had the same problem for quite a while. I have no idea why, so I'm just as interested as you are.



[Log in to Reply]  [No Email]
Nothin runs like a Deere

09-07-2006 10:48:18




Report to Moderator
 Re: 4020d Hydraulics in reply to masterwelder, 07-23-2005 12:29:08  
My 4020 has a simaler problem except it goes hand in hand with the cluch. If the clutch is in for very long at all, none of the hydraulics will work. I haven't driven any other 4020's so I don't know if this is the normal.



[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