motor would run but mixer wouldn't operate: broken worm gear

ApplianceKitchenAid Small Appliance

Model

Level of DifficultyEasy

Time to do repair30 - 60 mins

Age of Appliance1 - 4 years

Tools Screw drivers

Raymond From Shirley, MA

Apr 12, 2009

31 out of 33 people found this instruction helpful

My girlfriends' stand mixer failed when the accessory drive cap fell into the mixing bowl and jambed the beater, spliting the worm gear. The teeth on this gear are made of nylon and are molded to an aluminum center. This part is designed to fail in situations like this, saving the more expensive transmission parts. Following a repair manual I found online, I first removed the rear cover and pulled out the cord strain relief out from the base. Next I removed the drip cup from around the base of the planetary drive. I then used a pin punch to drive out the pin holding the planetary to the center shaft and removed the planetary. The unit was then inverted and I removed 4 screws holding the bottom cover to the gear case, and the 5 screws from around the planetary drive. The bottom cover was then lifted off. Three screws holding the worm gear bracket in place were then removed and the worm gear assembly lifted out. A small pin holds the worm gear to the shaft. I drove this out with a small pin punch and the shaft and worm gear were then removed. There is also a thrust washer on this shaft, and it's location is important. Make a note for re-assembly. The new gear was installed and the entire process reversed for re-assembly. A successful repair completed! My girlfriend would have replaced this $200 appliance, but I was able to repair it for less than $30 including shipping.

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Diagrams and Parts List for this repair

Part PhotoPart DescriptionPriceAvailability

Worm Gear

Part Number: PS1491159

$4.85
In Stock