If you have a lot of loss within the system, the pressure can vary with engine RPM. If the valve spools are not worn and the relief valve is not leaking by internally, you should get the same pressure at less than full throttle as you do at full. If you do get the same 1250psi at 1/2 throttle as full, then the rest of the system is good and the relief valve spring may need to be shimmed or replaced to bring it back to 1500psi or reasonably close to that.
I believe the majority of these have the 12gpm pump and the 17 was an option... do you know which you have?
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Today's Featured Article - Memories of a Farmall C - by Monty Bradley. When I was a child, my grandparents lived on a farm owned by a Mr. Walters. The crops raised were cotton and soybeans, with about forty head of mixed breed cattle. Mr. Walters owned two tractors then. A Farmall 300 on gasoline and a Farmall C, that had once belonged to his father-in-law, and had been converted from gasoline to LP Gas. Many times, as a small boy, I would cross the fence behind the house my grandparents lived in and walk down the turn row to where granddaddy would be cultivati
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