Richard F Apopka , FL June 08, 2015 Appliance: KitchenAid 6 Qt. Stand Mixer KP2671-3 Kitchenaid Mixer Kp2671-3: Gears worn down in the mixer head. How to replace Bearing, Worm Gear. PURCHASED AND REPLAED GEARS IN HOUSING HEAD. APPLIED AMPLE NEW GREASE AFTER REMOVAL OF ALL OLD GEAR GREASE. KITCHENAID NOW WORKS GREAT Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes