Replace damaged spur gear

Chances are the pinion and spur gear mesh is improperly set. Replace the stripped spur gear and install it so that there's a slight amount of backlash between the two gears. The best way to set the gear mesh is to loosen the motor mounting screws and then feed a strip of paper between the pinion and spur gear to provide the proper spacing. Once the gear mesh is set, tighten up the motor mounting screws.

Spur Gear Maintenance