Not sure if this was solved, but I just did a power steering unit rebuild on my 2072 and had a similar problem. I was very meticulous and assembled it according to the service manual.
I got it all back together and had no power steering, no hydraulic lift. I finally figured out the picture I had drawn of the hydraulic lines was drawn with all four wheels on the ground. I reinstalled everything with the tractor vertical (front wheels up in the air) and must have drawn my picture upside down. Somehow, I had the lines switched. Switched them to the proper placement and the it immediately worked.
However, the hydraulic cylinder for the mower deck works fast when raising the deck, but very, very slow when lowering now. Still trouble shooting that one.
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