Question about KitchenAid KSM90 Ultra Power Series Stand Mixer

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Runs but doesn't turn. Worm gear is not broken.

Was going to replace the worm gear but it isn't broken.

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  • KitchenAid Master
  • 2,119 Answers

This parts diagram may help.
Kitchenaid Stand Mixer Parts Amazon

Posted on Dec 29, 2014

  • Ross Keen Dec 29, 2014

    OK, so the parts to look at are #6, #8, #13 (there are 2x) and #14. You cannot lose drive anywhere else.

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  • KitchenAid Master
  • 1,363 Answers

Something must be broken if the motor is turning and the planetary is not. It will be one of the following, we will start from the first point of contact with the armature
1) Worm gear broken (fuse gear) you say no teeth broken
2) Worm gear not broken but whole unbroken plastic part not gripping aluminium boss
3) Pin through worm gear broken or missing
4) Pin through centre (or bevel) gear broken or missing
5) Pin through small gear in planetary broken or missing
6) Pin through planetary hub centre shaft broken or missing

The most common ones in order of likelihood are, 1, 2, 3 and 6

Posted on Dec 29, 2014

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1 Answer

Kitchenaid Mixer Planetary becomes sluggish when met with resistance.


The problem will be with the worm gear, if the gear is not stripped then check that the locating pin for the worm gear is not broken or missing. Occasionally the plastic gear can detach from the aluminium boss between plastic and shaft. The worm gear is the 99.9% place where drive can slip. Afterthought, I suppose the planetary pin is not missing or broken??

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On low it makes a really loud grinding noise the higher you turn up the speed the slower it becomes.


It sounds like the Worm Gear is going out. The faster the motor runs,
the more damages the Center Gear is grinding away the teeth of the
Worm Gear. Things start to slow down, and eventually they will come
to a halt. It's time to replace the Worm Gear. Also make sure to use
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I own KitchenAid RRKP50 350 Watts since late 2004. and it stopped working last night. I searched internet and found that the worm gear is might be the issue. So I opened it and noticed that the tooth on...


I belieive i"ve found what you need at -the gourmet depot.net-click on worm gears on the list on left side of page,parts with pictures and listings will come up.I think you will want the kp50 series 5 parts

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Hobart a200 will run just fine without anything in the bowl, once I pour my ingredients into the bowl, it wouldn't even mix the ingredients. Try all 3 gears.


Short answer: something is worn/broken inside the mixer's transmission.

Longer answer:

Since none of the three gears operate, the problem is most likely on either the worm gear shaft (probably the brass worm gear itself) or the "transmission shaft" (ironic name as all three shafts could be called transmission shafts). If you're up to the task of disassembling the transmission, which is a very messy task, you'd probably find the problem on one of the two smaller shafts inside the transmission. You'll most likely find either a broken key or worn brass worm gear. Both of these items may have enough holding strength to operate under very light loads (such as an empty bowl) but slip once a load is presented.
Also check the planetary key. Remove the planetary by removing two nuts on the underside of the transmission, where the attachments attach (careful, as the whole thing will drop once the second, thin nut is removed). You will find a long key on the shaft (or in the planetary gear, whichever one it sticks to). Make sure it's not broken, and re-attach the planetary.

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While kneading bread my mixer suddenly starting hanging up at the back side. It makes the full circle but when it gets to the back it stops and "hums" and then sometimes will go on but most of the time...


It sounds like you have lost some teeth from your worm gear. This usually happens when the mixer has been overloaded. The teeth on the worm gear are designed to fail first to prevent more serious damage. To replace the part you will need to open the head on your mixer. The gears are at the front of the mixer packed in grease. It should be obvious that the worm gear has broken once the head is open. If it is not the worm gear, with the head open it should be easy to spot the problem. The gears are available as spare parts from several places on the internet. search for "kitchenaid worm gear"

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I caught a spoon in my kitchen aid stand mixer. The mixer will not turn, and oil leaked out of the side


It sounds like you have lost some teeth from your worm gear. This usually happens when the mixer has been overloaded. The teeth on the worm gear are designed to fail first to prevent more serious damage. To replace the part you will need to open the head on your mixer. The gears are at the front of the mixer packed in grease. It should be obvious that the worm gear has broken once the head is open. If it is not the worm gear, with the head open it should be easy to spot the problem. The gears are available as spare parts from several places on the internet. search for "kitchenaid worm gear".

When you replace the worm gear, you should be able to see if you need more grease. This will have been the "oil" you saw escaping.

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Grinding sounds and slower mixer speeds


It sounds like you may have a broken worm gear inside your mixer which is a common problem.It is a wearable part which transfers the power from the motor to the main drive. It may be chipped or damaged right now, and running it will cause more damage. Part number for the worm gear is W10112253. This does however require some know how to replace. Hope this helps

Thanks

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Kenwood chef A701A mixer not working but blender does


could be one of three things
1) the belt is broken to the main gearbox (fairly easy to replace if you can get one)
2) a gear has slipped or broken which means none of the front end will operate.(I have this problem and cannot get the gear body to open)
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Hi. Go to the kitchenaid website, search for the parts catalog for your model of mixer. Download the file and use these expolded diagrams to get to the worm gear shaft. You'll have to remove and save the grease when you remove worm gear. This is a messy, but necessary job.

You don't say what caused the worm gear failure in the first place. If you were making a heavy bread dough when it failed, you need to look further than the worm gear.

Once you have removed the top cover of the mixer, look at the now exposed transmission housing at the top front of the mixer. If this is a plastic housing, check it carefully for cracks. If you find cracks anywhere on this housing, you have discovered Kitchenaid's cheap plastic housing. If your warranty has expired, remove this trans. housing. If you've never done this type of work before, I recommend that you take a digital photo at every stage of part removal, as these photos will help you when you re-assemble the mixer.

If you find that the trans. housing has cracks, this is the direct cause of your worm gear failure. You must check for further damage to the worm gear bearings and their seats. Look for cracks and/or pieces broken off of these bearings. Re-assemble in the reverse order using the photos and the drawings to guide you.

Be prepared to wait for a month for your parts to arrive. Insist on a new METAL housing for the under engineered trans. housing. Kitchenaid is now owned by Whirlpool Corp. The product is but a shadow of the way Hobart used to manufacture these mixers. If this solution has assisted you. please rate it. Good luck! ricardok45

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