The valves can be resealed without taking the blocks off the tractor. You need to clean everything around the valves very clean. If you can not do that do not even try to take them apart. Do one valve at a time. Do not mix parts. The spools are a select fit with it's valve body.
To replace the o-rings you need to slide the spool out the back. Begin by disconnecting the front of the spool from the lever. Next, unscrew the pipe with the cap and plug still on the end, With the spool and pipe assembly removed from the valve body, unscrew the big plug from the pipe. Clamp the front end of the spool in a vice with the end with the adjusting screw facing up. Clamp only to flat side on the front of the spool. Any damage to the machined surfaces of the spool can destroy the valve assembly.
Remove the adjusting screw, spring, ball seat and four steel balls. Remove the outer pipe and detent sleeve. Using a 1/2 x 20 (NF) cap screw with nut, install it where you removed the adjustment screw. Tighten the nut on the top of the spool and use the bolt to remove the remaining part of the detent assembly. The o-ring that is leaking is inside this piece. The pin an o-ring are replaced as an assembly. Replace the other o-rings. There is one located the the front of the block that can be replaced with the spool removed. Assemble everything in the reverse order you used to take them apart.
Adjust the detent screw so that the detents will hold the valve on causing the hydraulic relief valve to open. Then back the screw out 1/4 turn at a time until the detents allow the valve to return to center when maximum hydraulic pressure is achieved. You can set them lower if you want, just make sure they recenter themselves rather than stay on high pressure,
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 ]
Today's Featured Article - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
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.
