It could have spun on the spindle and welded itself on. Can you unbolt the six bolts and take the spindle off? If you can't get a bearing separator behind the bearing then you'll have to cut it off. The best to do that is a cut off wheel on a grinder or a die grinder. If bearing separator will fit with a puller pulling against a flat plate against spindle with nut threaded on flush with the end. I have done both.