The history of the fluids in a SMTA was, gear lube when it was new, like 80-90. The 10wt in pto. Some where along the line, IH realized the heavy gear lube was preventing the rollers in the over running clutch(ramp and rollers)from moving freely. Then they needed a oil that would flow better in cool weather conditions but present hydraulic oils did not give the necessary lubrication for the transmission and final drive. With that they had some one develop and additive that could be used with 10wt engine oil to provide the necessary lube and fluidity. We used one gallon per 12 gal oil of this with a fill in the transmission, rear end, TA of all tractors equipped with a TA . After Hy tran came out all TA equipped tractors used HY tran, including the pto. TA units always share same oil as transmission but pto's were a separate housing. There was dozens of service bulletins related to all of these issues.
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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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