I don't think it is a filter issue unless you have a loader with a second filter that is plugged. I found one under the loader frame.
You might try putting the old oil cooler relief valve back in and see what happens. Could be the flow divider. Does yours have an adjusting screw in the middle between the two front openings? Could have too much flow going to the power steering. That adjusts the flow to the power steering and affects how much is then bypassed. You might check the pilot valve. I think the buzz is associated with a bypass issue. Something I thought of after looking at an earlier post, get a metal rod or pipe has a homemade or buy an automotive stethoscope and try to pinpoint the exact location of the buzz.
In trying to identify my 2606 industrial and its hydraulic problems, I looked at the parts catalog for everything from the 460 to the 860 and between. On the industrials I did find an alternative high capacity hyd. filter. The dealer said they haven't carried those in years. When I cross referenced them to wix at www.wixfilters.com I found that the high cap filter was over an inch thicker. When I pulled my filter, it was a standard one and there is not room to put in a filter an over an inch thicker. Mine has duel pumps with a 9 gpm and a 17 gpm for the loader and backhoe that all goes through the standard filter feeding the pumps. The 3000 loader had an auxilliary filter but it was upstream.
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