James W Damascus , OR January 15, 2020 Appliance: KitchenAid 6 Quart Professional 600 Bowl Lift Stand Mixer KP26M1XOB5 Kitchenaid Mixer Kp26m1xob5: Mixer was loud when running and would not maintain speed. How to replace Speed Control Assembly. Installed the new parts I ordered. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes