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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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