firemanjim
Just kartin' around....
What he said .. 





Check to see if it has been welded on first, maybe the welds ground off...
Heat.... Need heat... Polish the ends of the shaft to allow the sprocket easily move... Remove all bolts and snap rings.. While heating the hub rub a candle stub in the joint... The paraffin helps to lubricate the joint and break free the hold...
Keep the torch moving... Check to see if it budged a bit with a soft hammer...
Was it removed first before jack-pressing it over???
If not I'd check to see if anything isn't bent for in which the jack was butted against.. Just saying...