The Allis will have more hp and the Oliver less hp than the Case. I don't know much about either of the other two, but have spent a lot of hours on a case 830. There are two versions of the 830 and each of those had a choice of two clutch types. The early eagle hitch version had cases answer to the theee point and was a lower platform like the older 88 Oliver and the d19 allis. The newer comfort king had the high platform like the Oliver and the later allis models. The case could come with either a standard dry clutch or the case-o-matic drive which is a torque converter system similar to an automatic in a car or pickup but with a manual lock up so it will pull like a dry clutch but can be unlocked to use the converter when needed. You won't find a tougher or more reliable tractor. The short comings of the case are the steering is power assist so not quite as powerful as the others and the brakes need to be kept up to work good. Both are adequate, but some others are better.
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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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