Got your pics. Looks like the seal assy is part of the gasket between the axle & hub. You have to remove seal & gasket assy (plan on replacing these) & underneath you should find 2 large nuts- 1 behind the other with a locking ring between them. The outer nut is a locking nut. Remove both nuts & locking ring & the hub assy should become loose. You may have to slack off the adjustment of the brakes to remove the hub. I balance the hub on a floor jack when removing the hub- makes the job alot easier if you're by yourself.