The idea you described will not work. Putting a T into an open center pressure line will not provide enough pressure, unless you also simultaneously work another function on the valve bank that that pressure line feeds. Also, the relief valve plumbed as you describe will relieve the pump pressure on that side of the circuit for any function to 1000 psi, and will have no effect on the oil trapped in your thumb cylinder.
The proper way to do it would be to use a power beyond valve to operate the thumb. (I am making an assumption here that the factory system relief valve is in the control valve block.) One of the supply lines going to your valve bank would need to be connected to the IN port on the accessory valve. Then a line would connect the power beyond valve to the inlet port on the original valve block. The relief valve in the accessory valve would need to be set to match your current system pressure. There would also be a return line from the accessory valve to the tank. You could then put a relief valve like you describe in the “close” line of the thumb to allow it to release when the bucket is curled against it.
A valve like a Gresen V10 sectional would be really easy to configure for what you need and has the bonus of being able to put the work port relief right in the control valve. Not the cheapest but possibly the simplest.
The easiest solution would be to keep the setup like it is, just upgrade lines and possibly valve to handle the return flow from both pumps. Then add a relief valve in the hose going to your thumb.
Upload one or more videos to your post. Photo and video filesizes should be less than 5MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
... [Read Article]
Latest Ad:
Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
[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.
