> But a heavier tractor needs more power to move itself and the load it is pulling.
There are numerous ways engine horsepower is lost on its way to the drawbar, including rolling resistance. But the big one is wheel slip, particularly in lower gears. All other things being equal, a heavier tractor will have less wheel slip than a lighter one. But in the end, what counts is how much power is delivered to the drawbar. And the Nebraska tests clearly show the 5010 has over a third more drawbar horsepower than the 4020 in every gear. It's silly to claim a stock 4020 can out-pull a stock 5010.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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