In Reply to: 1989 Lincoln Steering Pump posted by Jack - Iowa on September 11, 2019 at 07:49:11:
Welcome to Ford. Ford does not use Saginaw pumps. Uh, oops?
You can also cause power steering problems by turning the wheel without the engine running. Hopefully you also flushed the system with each install to remove the grit.
You can also install an in line filter that might help filter out the gunk.