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FYI One of the quickest ways to "fry" the internals of a Saginaw power steering pump is to hold the steering at full lock and rev your engine to high rpms. With the steering at full lock, power steering oil is prevented from circulating through the system. The pump goes into pressure relief and all of the fluid is recirculated inside the pump. The fluid is quickly superheated and internal pump parts can fail.
Getting a car stuck while parallel parking on a snowy day causes a lot of pump failures. People crank the steering to full lock, and then they get suck and spin their tires trying to get out of the parking spot.
Doing donuts in an open parking lot can give you the same type conditions that could fry the pump internals.
Typically, you need a whole new pump. Rebuilding the pump probably won't be sufficient.