Question about KitchenAid KSM103 Professional 5 Series Stand Mixer

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KSM103 won't run

I blew out the worm gear kneading dough, so I took the mixer apart and replaced the gear according to the repair manual. Managed to get it all back together without any leftover parts, but now it won't run at all. There is power to the wire connectors, but there is no response at any speed when I turn it on. The machine doesn't even buzz. What should I check?

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  • econ327 Mar 25, 2008

    Check the brushes mine did same until changed carbon brushes.
    Now have striped gear how is lower assembly removed from motor area.
    Their is a pin thru drive shaft but impossible to remove. I see screws under round bottom plate .



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I had removed carbon brushes and when tried to start nothing happened kept removing brushes it eventually started

Posted on Mar 22, 2008


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1 Answer

Why can't my kitchen aid mixer turn n

Sounds like the worm gear was stripped. This gear is designed to fail when the load on the motor is too great. This protects the motor from overheating and burning out. By the way, the mixer should not be used above the number 2 speed when using the dough hook.

The worm gear is not all that hard to replace although you will have to contend with a lot of grease. See the Service Manual:

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It is not going to be a problem with the motor. It is going to be a chipped/damaged gear, a bent planetary center shaft pin, or possibly the planetary itself.

The first thing you need to do is take the mixer apart. You are going to have to clean of all of the gears and inspect them very closely. I recommend using paper towels and wd-40. If there is any damage, the gear will need to be replaced, in some cases the pin that sits between the worm follower gear and bevel gear can become bent, if it is, it also needs to be replaced. If all of the gears, bearings, and the pin are in perfect shape inspect your planetary assembly. In some cases the center shaft, which is pressed into the planetary can become loose, so it will still spin under no load, but as soon as you put something in the bowl it stops spinning.

Here is a link to the KitchenAid service manual. This will walk you through how to take the mixer apart, and put it back together:

Please let me know if you have any questions, or need help with the repair.

Thank you,

Customer Service

Feb 15, 2013 | KitchenAid KSM103 Professional 5 Series...

1 Answer

I have a KV25GOXWW stand mixer that from what I have read here needs a new worm gear. I checked the neil crockett site for instructions and they are great BUT, my machine does not have the little scr

It actually can be a couple things1 the worm gear2 the worm follower gear3 the thrust bearing4 the transmission cover5 the bearings on the worm gear front or rear6 the planetary main gear 7 the planetary shaft gear

You will have to open up the mixer and clean each of those to check them out. On the KV25 all are easily do-able just have a large work space and a lot of paper towels. This is a very serviceable machine. let us know what else you need.

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1 Answer

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they should be a tight fit as the clip is just to help retain position
if they are ment to be loose replace the clip and inspect the groove for the clip as the edges may be worn to a taper rather than a sharp edge which will allow it to be moved out under load

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The Nylon Worm Gear has stripped. This is designed into the part so if the Mixer gets overloaded, it won't burn out the motor. Which is odd if you have the reset switch like I do.

Part# 4162897

You can buy it online at

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My mixer was straining to stir bread dough. Now the motor turns on, but the arm does not rotate.

Did you hear a CRACK sound just as the mixer stopped running? If so, the plastic transmission housing may have failed & destroyed the worm gear and the front and rear bearings and possibly deformed the bearing seats as well. It happened to me. Although these machines are marketed stating that they can knead bread dough, they can't. Mine failed 5 months out of warranty, after only30 batches of Sourdough Bread. Take the top cover off of the mixer and look for the transmission housing near the front of the mixer. If there obvious cracks in it, it is your problem.

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You are going to DESTROY YOUR MIXER by kneading dough with the flat beater. Read the directions. They spell it out in big letters. Only use the dough hook for dough; only use speed 2.
If the mixer generated enough torque to knead dough with the flat beater (it doesn't), it would tear up and overwork the dough. As it is, you're lucky you didn't strip a gear.

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you will have to spend some money to have your machine fix it has worn parts.need to be serviced call in the repair man to slove your problem.goodluck.

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