James G Wisconsin Dells , WI April 04, 2017 Appliance: Model KP26MIXOB 575 WATTS The kitchen aid mixer stopped mixing motor ran machine chattered but did not mix Cleaned old grease from transmission gear box, (it was contaminated with worn gear teeth) Replaced two gears in the transmission. Replaced gear box grease. Unit back to full power. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes