ytech15, use a pry bar at the 3 bolt hole locations. Pry with the same force when you turn the pulley to the next bolt hole location. You may need to do several rotations of the pulley, but if the penetrant has worked on the rust it should break free. The pulley fits fairly snug to the shaft, keep it aligned perpendicular to the shaft as you pry. Once you remove the pulley use some emery cloth on the hole in the pulley and the shaft to simplify reinstallation of the pulley.

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Fred Hoelzle