Sheldon Z Phoenix , AZ February 04, 2019 Appliance: KitchenAid 5 Qt. Stand Mixer Professional Heavy Duty Bowl Lift KG25H3XSL5 Kitchenaid Mixer Kg25h3xsl5: Worn gears made paddle and dough hook stop turning under load. How to replace Stand Mixer Worm Gear. Took top of mixer and inspected gears. Ordered replacement gears from AppliancePartsPros. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes