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 Tractor Lovers Dream About - by Angus Crawford. The day started at five o'clock on the morning of Friday, the January 29, 1999. My father, my sister, my uncle, my cousin and myself all climbed into my uncle's Toyota van. It was six thirty in the morning and we had a long day ahead. We traveled for six and a half hours to our destination - a little country town with a population of no more then one hundred and fifty people (57 of them being children under the age of thirteen). We arrived hoping to meet up with a man we knew had over one
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