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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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