How to Fix a KitchenAid Mixer That Isn't Spinning

Picture of How to Fix a KitchenAid Mixer That Isn't Spinning
KitchenAid stand mixers usually stop spinning because of a failed worm gear, and this article explains how to fix the problem at home.

If your KitchenAid stand mixer has stopped spinning, chances are that it doesn't have to mean the end of your mixer's service life.

To add to the good news, many KitchenAid mixer repairs can also be done right at home with simple tools, saving you money at the repair shop.

KitchenAid stand mixers are designed to survive a number of normal breakdowns and parts replacements. Some parts, like one of the gears that spins the mixer, are even designed to wear over time and/or fail under stress.

This articles explains how to replace the worm gear in a KitchenAid mixer, the part that most commonly causes a mixer to stop spinning in many stand mixer models.

Anyone can take household repair matters into their own hands with this professional repair information and's online inventory of O.E.M. KitchenAid parts.

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Step 1: KitchenAid Mixer Worm Gears

Picture of KitchenAid Mixer Worm Gears
Just to clarify, the KitchenAid mixer part that spins is called a planetary. This is the part of the mixer on the underside of the motor housing where KitchenAid accessories attach.

KitchenAid Mixer Planetary Assembly

The mixer's gearbox is positioned just above the planetary in the front end of the motor housing. Several gears inside the gearbox work together to spin the planetary.

For this style of KitchenAid mixer, one of the gears is specifically designed to fail before the others--a gear called the worm gear.

KitchenAid mixer worm gears are made to absorb stress and friction during operation. They can either wear slowly over time so that metal gears do not wear, or they can completely fail when the mixer is overloaded, as a safety mechanism. 

In this mixer style, the worm gear is made of a hard nylon material that is less hard than the other metal gears in the gearbox. This difference in hardness ensures that the worm gear breaks before the metal gears tear each other to pieces.

Because KitchenAid mixers are made to last many years (even decades) you should expect to replace the worm gear in this style of mixer sometime during its service life.

SuanneS1 month ago

Thank you, thank you, thank you! I love that you explained the reasoning behind the malfunction as well as the repair.

farrahd88802 months ago
Wow thank you so much for this video! I broke my mixer this week from trying to kneed pasta dough. I was so upset because I use it almost daily. When I first watched this video I was a bit intimidated. I found the piece easily in town for less then 20$ and it was actually the whole tower include worm gear so I ddnt have to do all the little work of taking all the small parts took me about 15 mins to complete while making dinner and tending to my 3 kids all at once! Your instructions were fool proof . literally. THANK YOU SO MUCH!!!!

Just today my very old mixer decided to go seriously slow. I was fortunate that what I was mixing didn't require a higher level because no matter what level I turned it to, it remained the same very slow mixing level. This mixer was my Mom's and I remember it as a teen. I'm 49, so you know this thing has seen many good years! Would you say it's just finally dying (nothing has ever been replaced on it), or is there a chance to fix even this old machine? Do I assume it has this same worm gear as a newer one? On top it says model 4-C.

IrshaadA4 months ago

I have recently replaced my worm gear and my center gear is fine but my kitchen aid mixer still isn't working.What do I do?

RobertH66 months ago

I have Model KG25H3XWH 5 qt. stand mixer that I think needs a worm gear. Any step by step instructions for that dismantle?

RobertH66 months ago

I have Model KG25H3XWH 5 qt. stand mixer that I think needs a worm gear. Any step by step instructions for that dismantle?

canida1 year ago
Thanks, just used your instructions on the stand mixer here at Instructables HQ!