I'm guessing that was about the time all the forage harvester mfgrs. were starting to build two row forage harvesters and the engineers calculated that tractors approaching 100hp would have enough torque to shear drive shafts under heavy load and would risk snapping the pto shafts off and reduced the size of the choppers drive line thus saving money for them the mfgr. also reduced the gearbox size. This is also why most tractor mfgrs increased the size of the 1000rpm pto shaft in there tractors approaching 200hp. If you bought a new IH and wanted a split pto for tractors over 100hp they were not covered under their warranty even though I don't recall seeing any broken myself even up through a 1586 but we never did much 540 work with it except maybe a Woods batwing.
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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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