Sounds very much as if the worm (follower) gear needs to be replaced. This is a sacrificial gear which fails under too heavy a load preventing failure of the motor itself.
Replacement is shown on videos on the net and you can download the Service Manual at:
http://www.kitchenaidparts.eu/documents/pdf/service-manual/classic-svc-manual-new-email-version.pdf
SOURCE: Dough hook & beaters slipping
You can take it to Bosch service center for repair , check this link for the nearest service center in your location http://www.boschtools.com/Service/ServiceCenterLocator/Pages/default.aspx
Hope that helps........
SOURCE: Hobart N-50 mixer clangs on 1st and 2nd speed
CE is the marking that shows its european conformant. I think the difference is mostly in terms of the no volt interlock switch. This means the KA style N50 bowl won't work with the CE models - too low.
SOURCE: mOTOR SPINS ON MY CLASSIC STAND MIXER BUT GEARS DON'T ENGAGE
Hi all. There is damage to the transmission caused by overloading the mixer with bread or cookie dough, or by dropping a spoon or measuring cup into the mixer while it was working.
Go to mendingshed.com and download their free kitchenaid repair manual. This manual has all you, or a repair person will need to repair your model's mixer. Mending Shed also sells needed parts.
If this solution has assisted you, please rate it. ricardok45
SOURCE: KitchenAid Artisan 10 speed 325Watt Mixer
Be sure the gears mesh fully with your repair. There is a mechanical fuze; a single plastic gear engineered to control damage in event of physical overload from overmixing heavy batter or dough & overheating it causes, use of wrong mix accessory for the batter, slamming into high speed from a stop, mixing real marble into marble cake, etc. These loads can cause bushings in the worm gear assembly to shift so that part of the worm gear runs above the double gear with which it meshes. This mis-mesh match reduces the load the gears can carry so that metal gears break if the mixer becomes heavily loaded again. Locating dowells pretty much assure the gears teeth mesh to proper depth automatically- its the vertical alignment at issue. Special fibre shims, not mere fiber washers, are used to realign; they properly resist deformation and wear.
Also look out for bent or broken dowell pin retatning the large doublegear on the propeller shaft. (the agitator shaft holds the beater, has similar dowell)
Note that the KitchenAid grease is food-grade with no known toxic effects- substitute at your peril.
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