worm gear worn

ApplianceKitchenAid Mixer

ModelKSM90PSM4

Level of DifficultyA Bit Difficult

Time to do repair30 - 60 mins

Age of ApplianceMore than 10 years

Tools Screw drivers

Linda From Bolingbrook, IL

May 23, 2014

I removed the screws on the back and base of the mixer. Took off the retaining ring and screws holding the mixer beater bar. Tapped out the retaining pin using an allen wrench and hammer. Carefully as not to scratch the unit. Removed the old grease, the screws holding in the worn worm gear. Replaced the gear, re-greased and reassembled the unit. To line up the retaining pin I used a very small allen wrench to get through the hole as it needed to set down all the way. Then when I wiggled it down it lined up the hole for the retaining pin. I tapped the pin back in place with the hammer and a larger allen wrench. Replaced the screws, lightly greased the gears. I had taken the "brushes" out earlier and learned that they go in a certain way. I also learned that the screw at the back by the wires, by adjusting it tighter or looser controls the speed lever. If your mixer won't work on low speed the screw has to be adjusted!

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Diagrams and Parts List for this repair

Part PhotoPart DescriptionPriceAvailability

Grease - Approx. 1 pound

Part Number: PS357146

$27.67
In Stock

Worm Gear and Bracket

Part Number: PS734273

$12.03
In Stock