You have the early hydrostatic PS. It has a flow control valve, a piloted slave valve, and a two port directional control valve on the steering shaft.
You can get rid of the last two items and replace them with a four port "hand pump" found on later tractors. I did something similar on a 8000lb Clark forklift. It has its own PS pump from the factory. Works great. I got a brand new four port "hand pump" on eBay for $125. Surplus Sales, Lincoln, NE, has them at a higher price.
I have a 504 that didn't have PS. I put a Char-lynn torque generator down where the steering shaft enters the bolster. IH had the same system but placed the TG below the steering wheel. If you don't want to break into the hydraulic plumbing, install a A or C (or later) hydraulic pump on the engine. It's a bolt-on with your engine. A little bit of the right frame rail has to be ground away.
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Today's Featured Article - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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