Debra J Bozrah , CT January 31, 2020 Appliance: Whirlpool 4 1/2 Qt. Stand Mixer Classic - Tilt K45SSWH-0 Whirlpool Mixer K45sswh-0: It stopped running. How to replace Worm Gear And Bracket Assembly. Replaced the phase control board and worm gear. While I had it apart I cleaned it out and replaced the grease which was breaking down and dripping. 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours