Have you looked at the pump from the top, and can you see the area where a top destroke valve would be located?
If pump pressure drops below 1800? psi the priority valve is supposed to close off oil flow other than to steering and brakes to "save" the operation of those vital safety functions.
Low pump pressure COULD cause your issue. In my experience it would be RARE for the priority valve to fail in a manner that would cause loss of flow other than to steering and brakes, of course strange things can happen.
By any chance, is there a quick-disconnect hydraulic coupler (or two) between the tractor and the loader? They can fail to open when connected and cause problems like this.
How is the loader connected to the tractor hydraulics, and does the loader have it's own valve(s)?
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