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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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