Scott
You're welcome. There's no need to remove rear wheel/tire to remove hyd oil sump screen. One needs to drain hyd oil before attempting to remove the screen. Plug has a square recess that I think a 1/2'' drive breakover or ratchet will fit into the recess. Photo I posted is not my tractor but photo I harvested from another JD thread. JD model 510 which was painted industrial yellow @ Dubuque, Ia factory is very similar to JD model 3020 that was painted green @ Waterloo, Ia factory.
Jim