Yesterday's Tractor Co. Shop Now
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
Classified Ads
Photo Ads
Tractor Parts

Discussion Forums
Project Journals
Tractor Town
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs

Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Classic Trucks
Kountry Life
John Deere Tractors Discussion Forum
Show Parts for Model:

JD 4630 hydraulic issues

Welcome Guest, Log in or Register
Author  [Modern View]

06-11-2012 20:04:32

Report to Moderator

On our JD 4630 we seem to be having issues where the hydraulics are slow but it seems like there is a leak somewhere internally. When raising the cultivator on the 3 pt hitch at about 1000 engine RPM it lifts slower than normal. WHILE raising the cultivator the engine SEEMS to be under less load from the hydraulic system than when the cultivator is fully raised. Question is, where is the most likely place on these tractors for an internal leak? I would also like to note that the steering seems hard sometimes. After cultivating for a while I took a temp gun to note hydraulic oil temps... transmission oil filter housing was 135 degrees, steering valve above the engine was 155 degrees, main hydraulic pump was 150 degrees... could there be an issue with steering valve? Any input would be greatly appreciated, thanks!

[Log in to Reply]   [No Email]
Tx Jim

06-13-2012 04:11:02

Report to Moderator
 Re: JD 4630 hydraulic issues in reply to F-I-T, 06-11-2012 20:04:32  
Quoting Removed, click Modern View to see

Actually there is no relief valve in the hyd pump but rather the stroke control valve(parts keys #42,43 & 44) which controls stand-by pressure.

[Log in to Reply]  [No Email]
Tom OConnor

06-12-2012 12:01:43

Report to Moderator
 Re: JD 4630 hydraulic issues in reply to Curtisk84, 06-11-2012 20:04:32  
Our 4630 had a relief valve on the bottom of the pump that failed several times and you could not see anything wrong with it but when replaced everything worked as it should. It is under the plug that is just left of center on the bottom of the pump. Hope this helps.

[Log in to Reply]  [No Email]
Tim S

06-12-2012 06:31:24

Report to Moderator
 Re: JD 4630 hydraulic issues in reply to Curtisk84, 06-11-2012 20:04:32  
stick a 5,000 psi gauge in the SCV and see what your stand by pressure is, if it"s below 2250, adjust the stroke valve screw "in" do bring it up to 2250psi (or a bit over),,then see how thing work..

[Log in to Reply]  [No Email]
Tx Jim

06-12-2012 04:19:22

Report to Moderator
 Re: JD 4630 hydraulic issues in reply to robert henry, 06-11-2012 20:04:32  
How long since hyd filter was changed and sump screen changed?? Has stand-by pressure been checked lately??
Steering valves have a history of internal leakage along with SCV's and rockshaft valves. Steering valve was changed to metering type at SN 010647- which normally gave less internal leakage problems.

[Log in to Reply]  [No Email]

06-12-2012 04:30:08

Report to Moderator
 Re: JD 4630 hydraulic issues in reply to Tx Jim, 06-12-2012 04:19:22  
Last year we changed the hydraulic oil and filters, plus cleaned out the sump screen. We just changed filters again yesterday, but that didnt help. Will probably drain oil this morning to check the screen again. have not checked standby pressure lately.

[Log in to Reply]  [No Email]

06-13-2012 05:37:44

Report to Moderator
 Re: JD 4630 hydraulic issues in reply to Curtisk84, 06-12-2012 04:30:08  
Thanks for the replies. To update of my progress, I checked the inlet screen and found roughly 5 large flakes of metal, not sure where from. The rest was just filings all around a cow magnet that someone stuck in there. Otherwise most of the screen was clean. Standby pressure was right at 2300 psi. Didnt use the tractor much yesterday, but it seemed ok the little bit that I ran it. The problem was always worse when the oil was warmed up. Will let you guys know if the problem continues, thanks for the help!

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

Hop to:

Fast Shipping!  Most of our stocked parts ship within 24 hours (M-Th). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a company you can trust and have generous return policies. Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ About Us ]

Home  |  Forums

Copyright © 1997-2018 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