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No power after replacing worm gear in Kitchenaid KSM90 Mixer

I replaced the worm gear on a Kitchenaid KSM90 Stand Mixer...was very happy that everything went back together, no leftover parts, everything seemingly in its place...but then, no power. I saw a post about the motor brushes but had never touched those. I checked them after the fact anyway and they appear to be in properly, with the concave face appearing to make proper contact. Any other ideas of what might have happened. Your help is greatly appreciated.

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Remove the rear cap from the unit. Power comes in from the black wire with the white being common. Hold a voltmeter lead on the white and check for power on the black. Power goes across the bottom of the speed control unit via a buss bar. Check for power on the right side, I think it is a red wire (may be a white one). Power is taken into the motor via that wire, goes thru the windings and the brushes and then out the other brush wire and back to the board. Check for power on the return wire. If it is dead then either the windings in the motor are burned out or one of the brushes is dirty and needs to be cleaned and reseated prpperly [note there is one and only one way the brush goes in!!!! Install it incorrectly and the brush will not touch the commutator.

Try that and see if it runs after cleaning the brushes.

Posted on Apr 01, 2010

  • Joshua Holmes Oct 09, 2010

    Really appreciate this answer, HOWEVER, can you please specify which way the the brushes go in? Thank you

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2 Answers

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


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

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Isn't KSM90 the model number?

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Get a copy of the Repair Part List for your model at Kitchenaid.com
Download a Copy of the Kitchenaid Service manual.

http://www.kitchenaidparts.be/centers/servicemanual/mixer.pdf

The Worm Gear (12) teeth was stripped and needs to be replaced.
The whole Worm Gear Assembly can be purchased on eBay for under
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MY kitchen Aide mixer was running alittle rough /loud and now has stop completely. It is approx 24 years old and has never had any problems. It is hard to find a local repair [place. any suggestions


Two things you can do for a 24-year old machine:

1. Replace both motor brushes (Black large plastic Caps on each side
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2. Replace the Worm Gear (the cause of the Rough Loud noises)

Download a copy of the Repair Part List from Kitchenaid.com for
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Also don't forget to tighten all the screws inside the mixers and use
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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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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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