worst case: oxy
heat up the pulley and it will come off pretty easily but you will need a new seal.
maybe:
wire brush it and soak it in penertrating oil using a plastic hammer or wood under hammer tap the pulley in all directions to lossen it up on the snout, then get 2 flat head screwdrivers and place one were the red arrow is and the other were that thumb is (between pulley and cover) and work it ever so lightly and i meen slightly and work it from there it might take a few mins it may take a few hours, take your time, wiggle away.
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