Use a universal puller to remove the pulley from the cutter wheel shaft:

Attach the universal puller to the pulley using the three bolts provided on the pulley.

Use a wrench to torque down the center screw to slowly loosen the pulley.

This may take a lot of force.

If the pulley seems to be stuck after significant pressure is applied with the universal puller, use a blowtorch to apply heat where the pulley contacts the shaft.