Doorpost and Operators Manual recommendations are compromises for undocumented reasons. I believe Max inflation imprinted on the tire is a better guide.
I have had the best results in fuel economy and tire wear using an IR temp gun to scan across the tire surface and adjust tire pressure to achieve a uniform temp across the tread after a half hour of operation. It often requires added pressures on loaded vehicles and ocassionally lowered pressures on empty vehicles.
Starting with Max pressure at the max load on the tire sidewall and adjusting to the same proportional pressure per actual load seems to be a good place to start rather than the pressures for unlisted variables that are on the door post.
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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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