My gas 4020 has a cube relay wired between the ignition switch and the starter solenoid. It takes the load off the ignition switch. But something caused my starter to keep running and with the gear engaged the running engine spun the starter fast enough to through the windings out of the slots. I had it rebuilt, took a new armature. I also demanded bearings, a new solenoid, and Bendix. I replaced that added relay and opened up the old one. I never did find what stuck, but I replace all but the start button and its not given any problem since.
I think the added relay was a factory service bulletin modification.
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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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