When I moved a loader to my 4020, I tapped the full pressure (closed center system, not load sensing like more recent tractors) and did put in the needle valve on the supply line to the loader (and a second one for a backhoe) because the tractor pump allows 18 or 20 GPM for the auxiliaries (reserves some for steering and brakes) and I know the loader worked fine with 5 gpm without a need for sandpapered finger tips on the valve handles. With 20 GPM smooth control required more sensitive finger tips than I have.

Gerald J.