I would take out the pilot relief valve and replace with a known good one from most any IH tractor built since about 64. It is on the bottom of the mcv, is a cartridge type valve , has screen in the end. It may be stuck. Or, with a gauge installed, low idle you could cautiously move aux valve but it can build pressure so fast this is very risky if you aren't very careful. I believe the book calls for 2500 psi on that model which is a lot of pressue even when things are working correctly. Correct way of course is with an inline flow rater that has it's own relief valve. A dealer could print a page of the manual for you to observe flow and correct placement of all valves in the mcv. Several different places to get manuals, I would think this site would have them.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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