Slow down slow down.... Its a compression type fitting. You remove the foyer bolts. Now look at it. It is two pieces. Smaller one gets drawn info bigger one, and locks on to axle. Just TAP the bigger piece, away from the smaller hub. If you look close , you can tell which way it should go...
EDIT
look at second pic.... That's the back side. Tap the larger section towards that chain. Should have a smaller hub dislocate from the larger section.