Stripped worm gear

ApplianceKitchenAid Mixer


Level of DifficultyReally easy

Time to do repair30 - 60 mins

Age of Appliance1 - 4 years

Tools Screw drivers


Aug 21, 2012

Used the meat grinder attachment, with the retaining ring too tight for the motor to turn the augur, so a gear stripped and the mixer would not run. I opened the mixer top, removed the transmission cover, removed enough grease to diagnose the problem (6 teeth stripped off the steel worm gear). I ordered a replacement steel worm gear and, while I was at it, a new retaining ring, bevel gear, retaining pin and the large planetary gear, as I could not tell the condition of these until I disassembled the whole gear train. I then removed the gear train components (needed a snap ring pliers to remove the retaining ring -- I don't recommend trying to remove it with an y other tool), washed them in acetone, cleaned out the transmission case and went over it with a magnet to get stray gear tooth remnants, replaced the worm and bevel gears and reassembled, using the original planetary gear, retaining pin and retaining ring. Filled the bottom of the transmission with planetary grease first, then, once the gear train had been replaced, slathered a big pile of grease over it, replaced the transmission cover. The machine then ran perfectly, so I replaced the mixer's top cover and decorative band and was back in business mixing with it about 30 minutes after cleaning the last of the grease off my hands. I should mention, I used a LOT of paper towels for this job. This was a fun job and I was sorry that it was so easy to do, as I enjoy working with gears and grease.

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Diagrams and Parts List for this repair

Part PhotoPart DescriptionPriceAvailability

Bevel Gear

Part Number: PS401575

In Stock


Part Number: PS401577

In Stock

Retaining Ring

Part Number: PS401634

In Stock

Worm Gear

Part Number: PS774065

In Stock

Retaining Pin

Part Number: PS974260

In Stock