I'm no expert on this but I imagine there are parts available. Depends upon how far you are from a parts supplier, what they stock, what is on backorder, and all the time and hassle of doing it yourself. It can take a long time but if you are an EMD mechanic then this may not be problem. Sometimes with the price of separate parts it is cheaper to go rebuilt. You have to be able to mike the shafts and bushings to see if in tolerance and the same for the shims. All o-rings & seals have to be replaced. You have to open it up to see if you have cessna or thompson pumps. Then the power steering pump is removable from the main pump.
You need an I & T manual #IH-25 to work through it along with printing out the parts diagrams & parts lists from the case website (www.caseih.com).
There is a small plug just below and between the two pump outlets. You can insert a 3000# guage in there to see what your working psi is. Do this with the wheels turned all the way in one direction. You should have at least 1100 psi. You can place a guage and shut off valve in the power steering line somewhere to test it. The guage is in between the pump and ball shut off valve. Close the valve to get a psi reading.
The bypass valve is attached to the power steering pump. It could be bypassing and still put out just enough fluid and psi to steer with no weight on the wheels. You have to pull the pump off to check and clean the bypass.
You can flow test your pump by pulling the power steering line off. Mark a 5 gal. bucket with a mark where a gallon and or two comes to. Then crank it up and see how many seconds it takes to pump a gallon. You should have 2.3 to 2.7 gpm at 1200 to 1500 psi (which is what the interal relief valves are set at). You might do this from the power steering return line also with wheels turned one way and then centered up to see what kind of flow you have coming out of the power steering. Little and weak flow would point back to the pump or probably the relief valve at the pump.
You didn't say whether the steering problem just happened or if there has been a steady decline over the years. A pump probably won't just up and go bad unless something was run through it and then both pumps would probably have problems. There would be a decline over the years with a bad pump. Working fine and then recently going bad points to a bypass or other problem and not probably the pump. But with any old pump there will be some decline since it was a brand new one.
You could also run a line from the other pump and go into the power steering to see if you have steering or not.
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