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 eReplacementParts.com's online inventory of O.E.M. KitchenAid parts.

Step 1: 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.

<p>I opened the mixer. I see there is nothing wrong with the gears, They look very fine in shape. What to do now?</p>
I was unable to get out my roll pin, any suggestions?
<p>I had similar problem. I spend hours figuring out. There were suggestion of heating, oiling etc. </p><p>If you damage the pin, it becomes harder to take out.</p><p>What I did:</p><p>I learned that the pin is even on both sides so you can hit either side. If your other side is not damaged, try not to abuse it,</p><p>Separate the top part of mixer from bottom so that you can easily manage,</p><p>Get 2 pieces of 2x4 pieces of wood so that you can lay the mixer steadily without any movement. </p><p>Now hit the better side with either roll pin removal punch or something very flat and round at the tip. </p><p>The idea is to have equal and appropriate force in right direction. </p><p>This worked for me. </p><p>Good luck</p>
<p>replaced worm gear and still isn't working?</p>
<p>ouch, the mixer parts link no longer goes to the parts site, it goes back to the inscrutable main site </p>
<p>got it ,, found it with the use of our friend google</p>
<p>wow ,this is nuts ,just ordered the part ,from usa ,I live in Canada ,the Canadian site switch to the usa site when I found the part on Canadian site and clicked to place order it switched to usa .. cost 15+ usa and shipping was more than the part .. in total its over 50$ Canadian for one f'nnn plastic Cog </p>
<p>Excellent instructions - we have our KitchenAid back up and running just in time for Thanksgiving pie making. One thing that I found, was that having the correct roll pin punches for each of the two times that you need one was critical. Had to make a trip to the hardware store for those. Notice the worn area on the top of the gear in the photo - seems to be a common occurrence, and the reason we all came to this repair site.</p>
<p>just took my daughters mixer apart and it was so bad that there was all kings of plastic fillings in the grease </p>
<p>Awesome tutorial! Fixed our Kitchenaid that was a wedding present from my Mum. It survived 6 years and 1 day before the worm gear gave up!</p><p>Big thanks from unusually sunny Scotland!</p>
A few years ago I had to completely disassemble, clean, and regrease a 50+ year old new to us mixer due to food allergies. (I was surprised where all flour could get in the housing). Just after mixing today the trim ring randomly fell off revealing metal shavings. A few swipes with cotton swabs revealed more from the housing screws. Is this likely the planetary or am I going to have to go back to the worm gear assembly?
<p>Thank you. Out of all the videos and instructions posted online, yours were by far the most clear. We have a lift bowl Kitchenaid, so this tutorial did not completely mesh with our machine, but it was close enough to get the job done. We have now ordered the worm gear, and will put it all back together when it comes in. Thank you for your great instructions, and for breathing life back into my mixer!</p>
<p>Worked great! The best set of instructions I've ever found on the internet.</p>
<p>Thank you for your easy to follow tutorial. I know have a fully functioning stand mixer. Not one stuck on speed 6. :) </p><p>But boy is that grease messy :)</p>
I found that buying the assembly was a comparable price to replacing the single gear; so, I did. But now my mixer will make one full turn and then gets stuck. I can't figure out what's blocking or getting stuck... Any ideas?
<p>Thank you, thank you, thank you! I love that you explained the reasoning behind the malfunction as well as the repair. </p>
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 apart.it 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!!!!<br>Farrah?
<p>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.</p>
<p>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?</p>
<p>I have Model KG25H3XWH 5 qt. stand mixer that I think needs a worm gear. Any step by step instructions for that dismantle?</p>
<p>I have Model KG25H3XWH 5 qt. stand mixer that I think needs a worm gear. Any step by step instructions for that dismantle?</p>
Thanks, just used your instructions on the stand mixer here at Instructables HQ!

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