Are you talking about pull-type plows? Semi-mount or what? Are you talking IH tractors?
However, on a mounted plow, the draft is actuated by torque load, it controls the suck/depth of that plow and the tractor is already carrying the weight of the plow to a large degree.
Suck is pulling "down" like you wouldn't believe. Tractor and draft are constantly trying to pull it back up out of the ground to maintain the correct level as set by the draft lever.
It's a continual give and take action and you can watch it work by watching the lift arms.
If you don't believe it, pull the position lever back up out of the "run" position. You'll feel it cylcle just about every two to three seconds as the suck of the plow pulls itself back down deeper and the hydraulics will then correct again by raising the plow.
Plow weighs the same to the tractor wheather it is in the ground a foot or out of the ground the same amount (not counting the balancing act on the guage wheel).
Stop the forward motion and the plow "weighs" less as far as the tractor is concerned because there is no suck.
Don't know how Allis tractors work; never owned one.
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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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