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
 
Marketplace
Classified Ads
Photo Ads
Tractor Parts
Salvage

Community
Discussion Forums
Project Journals
Your Stories
Events Calendar
Hauling Schedule

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

Research & Info
Articles
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
Glossary

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

Yesterday's Tractors Facebook Page

  

Re: 560 hydraulic problem


[ Expand ] [ View Replies ] [ Add a Reply ] [ Return to Forum ]

Posted by Owen Aaland on June 04, 2008 at 05:36:12 from (65.165.246.71):

In Reply to: 560 hydraulic problem posted by Wayne-FDL on June 04, 2008 at 04:55:04:

This is usually caused by a plugged or restricted orifice screen assembly or worn spool valves.

The hydraulic system on the 560 is a combination of closed center and open center hydraulics. They use an open center type pump and closed center valves. The unloader valve is designed to open whenever the valves are closed or the system exceeds maximum pressure. The flow through the orifice is used to control the unloader valve. It is also ported to the spool valves. When the valves are closed there is no flow past them and the pressure builds up to open the unloader valve. Normally this results in about 60 PSI of pressure in the hydraulic system. When a valve is moved the flows from the orifice is directed to the load side of the valve and this causes a drop in pressure which will allow the unloader valve to seat. When the pressure builds to the maximum for the system the unloader valve is again unseated to control maximum pressure.

If contamination collects on the orifice screen enough to restrict the flow to less than what leaks past the spool valves there will not be enough pressure built up to open the unloader valve and the system will go on high pressure.

In your case, since it is OK when the oil is cold, I would expect to find too much wear in the spool valves so that there is too much leakage to unseat the unloader valve when the oil warms up.

Check the orifice screen assembly first. If everything looks OK there you can compensate for the worn spool valve by enlarging the orifice hole. If you drill out the hole, only go a few thousands of an inch at a time. Go just far enough th correct the problem with the hydraulic oil hot. You will need a set of number drill bits to get a small enough increment in hole size.


Replies:




Add a Reply

:
:
: :

:

:

:

:

:

: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.


 
Advanced Posting Tools
  Upload Photo  Select Gallery Photo  Attach Serial # List 
Return to Post 

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


Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre ... [Read Article]

Latest Ad: Oliver 550 Diesel runs like a watch three point hitch pto engine gone threw about two hundred hours ago nice clean tractor [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 Headquarters

Website Accessibility Policy