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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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