If you have flow, the pump is turning... should not be a disconnect between the pumps. You have a problem elsewhere in the system and the most likely suspect is the relief valve has something sticking it open, or a problem in whatever valve controls steering direction. Most of these relief valves are "pilot operated". meaning there is not a main spring controlling the pressure, but a pilot circuit that "feeds back" from the system pressure. Does not take much contaminent to plug them up.
I have worked on a 460U, but as I recall, all I did was change the main pump from the standard 12 gpm to the optional 17 gpm. This was to run a field test at Cessna, running a bush-hog type mower with a high torque hydraulic motor in place of the PTO gearbox.
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