Too late now, but you should never put a 17 gal pump in a 560. Too much oil coming through the filter (causes cavitation) with that and power steering pump which is about a 5 gal pump that is flow controlled down to about 3.5 gal to power steering. Totals about 22 gal per min at rated speed.And that is also too much for the design of those valves. Creates too much back pressure. Did you install a new suction tube and get the seal on it positioned correctly so it does not suck air. Is the hydraulic system operating on a low by pass pressure under 1020 psi with valves in neutral. Are all outlets weak or maybe just one that is directed through an optional check valve. Are the couplers restricting the flow. Power steering could be many things in steering unit. I would unhook return line from steering as check flow when not steering and when steering. If it is leaking through steering mechanism the flow will stay almost identical. If you have poor flow from pump it will change to much less flow when trying to steer. Too many variables to give an intelligent answer from here.
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