There are no 9/1030 case tractors with com. The com came in the 800 then 7/830 models. The 7/830 can also have a dry clutch. When you push the peddle it shifts to com not direct and you always start in com. They are very similar to an auto trany in a car or pickup only with manual shift. There is no actual speed or Geer change, only the torque converter being locked or unlocked. In direct they pull like any regular clutch tractor and in com the converter allows slip so speed matches load to power. The pto is independent and live and not affected by the drive system.
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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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