With my 3020 Deere's it is the temp guage with the 4020's it tends to be black smoke and my 4520 I do not know yet as I do not have any implements big enough to work it hard.I really do not work any of mine hard anymore as I just use the bigger tractor for the hard jobs. Back years ago I worked the 4020 alot of nights with 3-4 inches of fire coming out the muffler pulling a 5 bottom plow all night long.The 4520 just plays with the 4020-4230 size implements although chopping snaplage can pull it down. Tom
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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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