Orignial kitchenaid gear (snail) - Worn Gear Article number 4162897 With this gear you have the most likely spare part to fix drive problems of your kitchenaid kitchen machine. This gear is deliberately the weakest point of the drive to avoid greater damage to the machine if the stirring gear is used by, for example, to rapid operation or stirring quantities/stirring weight. Suitable for the models Kitchenaid Classic, Ultrapower, Heavy Duty, Professional and Artisan. Depending on availability in the color yellow or black You can find detailed instructions on changing the gear set https://www.youtube.com/watch?v=veciivpt7hk But the Motor is Still Running, then Gear Has Broken. You may find a good repair how to video here: https://www.youtube.com/watch?v=veciivpt7hk KSM 100, KSM103, KSM1.