Jeffrey S Martinsburg , WV November 19, 2017 Appliance: KitchenAid 6 Qt. Stand Mixer KP26M1XNP4 Kitchenaid Mixer Kp26m1xnp4: My Mom reported kitchenaid mixer would bang stop rotating and then bang again speed switch would not snap up. How to replace Gear. I replaced 3 gears and 2 bearing sleeves then repacked gears with recommended grease reinstalled gear box cover then replaced speed control module. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes