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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Re: KSM103 won't run

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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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:

May 20, 2014 | KitchenAid 32685 Mixer

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Drive Shaft stopped kneading dough

To give the mixer strength it has planetary gears. Something may be wrong in the gear section

Nov 26, 2013 | Bosch 800-watt Universal Plus Mixer with...

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Kp2671 stops and starts

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,

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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.

Jan 08, 2013 | KitchenAid Kitchen Aid KV25GOXWW -...

1 Answer

KitchenAid stand mixer KSM50PWH. Was kneading dough with dough hook attachment and it quit turning. Motor works fine but the part that's supposed to go round and round doesn't. Can I fix this?

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

Jan 17, 2011 | KitchenAid Food Mixers

3 Answers

KitchenAid 600, Stand Mixer - Loud grinding noise, happened when mixing bread dough. When bowl is lowered (dough hook disengaged) noise, hook turns. When bowl is raised so that hook engages dough,...

Hi. Stop using your mixer. If your mixer is still covered by warranty, call Kitchenaid Customer Service, they are very good with warranty repairs.

If your mixer is out of warranty, remove the silver band that surrounds the top of mixer. Remove the top cover. At the front of the mixer, locate the transmission housing which is now exposed. Examine this housing carefully for cracks. If you find cracks anywhere in this housing, you have found the under-engineered plastic transmission housing. Kitchenaid's replacement housing is made of metal. Your plastic housing has no business being in a mixer that is marketed as being able to mix bread dough. It cannot!

If you're confident that you can make the repairs yourself, go to the Kitchenaid website and download the parts drawings. Remove the Trans. housing, remove the worm gear shaft assembly which is driven by the motor.. Remove and save as much grease as necessary to thoroughly inspect the worm gear. Inspect the worm shaft bearings. Look for cracks, or missing pieces on the bearings. Look for crunched cogs on all gears. Be prepared to wait at least a month for your parts to arrive after you order them. The replacement grease should be Shell Darina 2, or Chevron FM ALC EP 2.

If you're not confident about repairing this yourself, call Kitchenaid and determine the nearest "approved" repair shop.

You may be able to pressure Kitchenaid to pay for the damaged parts in your mixer. They are still installing these plastic Trans. housing on new mixers. Insist on a metal cover when replacing. Apparently, Kitchenaid feels no shame in their manufacturing process, and will not issue a recall notice for these housings. They are substandard at best.

If you found this solution helpful, please rate it. Good luck! ricardok45.

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1 Answer

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.

Dec 03, 2008 | KitchenAid K45SS Classic Stand Mixer

1 Answer

Beater jams

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.

Dec 23, 2007 | KitchenAid KP2671 Professional 6 Series...

2 Answers

Kitchen Mixer not running correctly

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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