Try 819901.
As a general rule, when it comes to removing a sprocket from a facer motor, first make sure that there is no locking pin or locking screw through the middle of the shaft. If the sprocket is simply threaded onto the motor, as this drawing indicates, a sharp rap with a hammer on a box end wrench turning opposite the direction of motor rotation should break the sprocket free. If you use an air impact wrench, you can spin the facer motor fast enough to destroy the windings, so I don't recommend that. If it doesn't budge, stop and evaluate to make sure something has not been overlooked. The gear might be rusted or stuck on, but it will usually break loose with one or two sharp raps.
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