These come from the factory set up for open center use. If you didn't swap the plug yourself, that's the first thing I'd check. The closed center plug is bought seperately and has an O-ring on it. These valves also have a pressure relief on them that is adjustable. I think they are set to 2000 psi. Your tractor system pressure should be 2250 psi. I bet that relief valve is warm. I'd start turning it up until you don't feel or hear any chatter at the relief valve or just screw it in all the way. The stock valves I've seen didn't have this adjustment. Just bought a Prince valve for a 146 loader. Didn't know it was bigger than the original valve. Now I have to fab up a new mount for it. Won't fit the old one.
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