The 504 has two PS systems. Probably depends if it is rowcrop or utility. One system is hydrostatic with the valve at the end of the column, a flow divider, and a hydraulic relay that supplies directional power to the front axle.
The other system is a Charlynn Torque Generator directly below the steering wheel. Not sure where the power comes from. Perhaps a piggyback pump next to the main pump.
I put on a system on a non PS Farmall 504. I used a Charlynn TG right at the bolster. Power comes from a C, 100, 140 or similar hydraulic pump. That's a bolt-on installation below the distributer. 1/4" of the frame channel top flange has to disappear. The Charlynn required a bracket and a coupling. I suppose the Charlynn could go on any of the 4 (?) steering shafts. The closer to the bolster is the best arrangement when one considers the crappy U-joints and shaft bearings.
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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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