The 1566 had a DT436, I'd guess the 1586 did too. The gears are helical cut in the 15's instead of straight cut like in the smaller models. They also don't slide the gears, they have a synchronizer-type set-up, a coller slides over a set of dogs on the gears to engage them. A wider collar on the 2nd gear would help a 1566, as it was hard to find 2nd sometimes. I don't know if a 1586 uses the same part or not.
They are not a good haying tractor. The step from 1st to 2nd gear is bigger than the 4 speed tractors. If you run a diskbine with it you can easily be too fast or too slow. They are good for the chopper but that's the only thing we did with ours besides tillage.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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