The reason large tires are hard on spindles is because they move the center of ground contact out from directly in line with the axis of the spindle. It means more steering effort is needed because you now have to turn the tires in an arc rather than just pivoting on the ground. More importantly, it moves the center of the load out away from the larger inner bearing. The load is no longer applied directly up through the spindle axis but now is offset and results in a lever affect at the spindle joint. The larger the tire the more offset the load becomes. That is what causes the spindles to break off just inside of the inner bearing.
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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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