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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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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