My long time neighbor/farmer friend had a similar thing done with their JD 6620 combine. I assume, because I don't recall what it looked like before, that it did not have rear axle drive. His son said that they took the drive train from a 7000 series combine, and fit it up under there. I have greased this combine many times, it sure looked factory, but I wondered if there were any unique "snags" in the process. They also put new front tires on, oversize, the concern there was finding a weak spot say in the axles, in real deep sucking mud or if it got stuck so they operated it with that in mind, reason being for this modification was that like you mention, the harvest for so many years put them in the field with terrible conditions. I can attest to that by having to fix all the ruts where it was wet, but that 6620 would seem to get through most of it, 1st round in at my place though, there must have been a really saturated area, which does not occur much in this field, sunk in but good, 3150 pulled it out with it assisting itself too, without any trouble. I do have some photos of it combining oats, some small video from an old camera too, it sure looked like a beast that could muscle through some soft ground.
I have a retired neighbor who was one of those guys, would build trucks with multiple auxiliary transmissions and all sorts of ingenious, but creative mechanical wonders, very interesting and lots of fun pondering how he did things etc. Lost art today !
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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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