The problem with the early JD tractors: JD 5010,5020,4520,4620,4630, was that they had little torque at lower RPM. They needed some speed to have heir power. I had a JD 5020 for a few years. The only fertilizer spreaders around at that time where all 540 PTO. I had an adapter on it and would try to pull spreader at half throttle. Was a real gutless wonder at the lower RPMs
IH had/has a much better PTO setup with them stacked. I argued with John Deere company men for years telling them that having 1000 PTO on a tractor made it worth much less around here. The early John Deere 8000s where 1000 PTO only. Then they came out with the two speed PTO but you have to use that shear coupling to limit the horse Power. The you turn the electric PTO on too fast and break the shear coupling. Much fun!!!
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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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