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 - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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