Sprayed with WD40 for several days. Tried puller and it kept slipping. Put vise grips on the shaft. The fans were very hard to break loose but they did. Started spinning and pulling on the fans. Lots of spinning and WD40.... 20 minutes later.... Done. Make sure and measure each fans position on the shaft. Mark them left and Right. Draw a line across both fans with a marker showing how they were mounted in relation to each other. Draw a picture with the measurements noted.