A lot of those valve setups have check valves, balls and springs, and popoffs that get some gunk in them that cause intermittant issues. Those spools can stick and linkage gets bent to where the spool doesn't move like you think it is.
I had a broken spring on my IH popoff valve. The broken end of the spring would hang the ball up sometimes and finally got stuck there hanging out the opening. Put it in the vise to open the ball and the piece fell back inside before I could grab it.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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