It is closed-center pressure and flow compensated (PFC) And I know what I need for loader valving. I only want to know about the question in my original post.I'm not a JD man but you should have what is called a "closed-center pressure and flow compensated (PFC)" hydraulic system.
You can not use a standard open center valve on your tractor you will need a a pressure sensing control valve plumbed into your system