KitchenAid KSM90 Ultra Power Series Stand Mixer - Page 2 - Answered Questions & Fixed issues

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

KitchenAid KSM90... | Answered on Dec 29, 2014 | 420 views

Hi NORMR123, it sounds like your Switch Lever has loosened up and you just need to get to the attaching screw to tighten everything up. (I trust you reinstalled the motor brushes correctly so your mixer will run. Many folks attempt repairs by removing the brushes thinking it will provide access to the inside, then reinstall them incorrectly and wonder why their mixer doesn’t work.)
Be sure you have the Parts List manual on hand. If you're lacking one, you can download a PDF version from the KA website at:
Click on Customer Care>Locate Manuals & Guides> then enter the visitor type “Consumer” and the 6 character model number, in your case use KSM90P, in the Model Number box. Select one the files listed for your model that appears under Parts List (16): KSM90PSWH0.pdf (354.08 KB) and save that file to your PC (check to see if this matches your mixer model).
Although not providing step by step instructions, the Parts List manual provides an exploded view of the various component assemblies allowing you to see how the mixer all fits together. It is helpful for the disassembly, troubleshooting, and reassembly of your mixer.
Turn to pages 6 & 7, titled “Motor And Control Parts”, and locate Ill. Nos. 1, 2, 3, & 4. #1 is your Pivot Screw, which may have loosened over time. #3 is your Switch Lever and stud. Check the detent is present or rubbed down. If that’s the case, you may want to replace it.
As far as parts go, here are five potential vendors in no particular order:;;;; and (for grease). Prices can vary widely between vendors, so do some comparison shopping.
Finally, here are some links to several excellent websites that detail the disassembling/reassembly of a KA Mixer.
Between these three websites and their excellent pictures and descriptions and your Parts List manual, you should now be able to completely disassemble, inspect/adjust/replace your Switch Lever, and reassemble your mixer. Good luck, I hope this helps. Howard, Burke, VA
If this solution was helpful, please rate it, thanks! – hslincoln

KitchenAid KSM90... | Answered on Dec 09, 2014 | 7,009 views

Well first thing; here is the link to the KitchenAid site where your parts list can be found.

Next, the parts list will tell you what the part number is for the brushes and all the parts that make up the brush assembly. If you need to replace any part other than the brushes you will need to do a full tear down to do that. Also; remember that there are four different ways to replace the brushes but only one way will work. You need to be very careful to remember which way the old brushes come out, there is a beveled edge on one side of the brushes and the new brushes need to go back the exact same way or they will not reach the commutator on the armature and the mixer will not work until the brushes make that contact with the armature.
Lastly the reason that your mixer gets out of time is that over time, 8-10 years of use, the nuts on the speed control switch that hold the three timing screws in place simply get loose due to vibration and the screws can rotate in or out. Some times the screws vibrate loose and the mixer just will not turn on next time the mixer is used. Peeps then think it's broke and will not work so they sell it for parts and by a new mixer. When the only thing they need to fix it is a Phillips screwdriver , a small 3/8th open box wrench and about 20 minutes time to fix it.
Anyway I hope that this helped to answer your question. Please let us know if it helped and if not let me know and I'll try to help fixya.

KitchenAid KSM90... | Answered on Sep 03, 2014 | 197 views

If it looks like the photo beside the blue panel above I'd say it's a KSM 90 so you should be able to find your motor brushes and a downloadable manual with the help of Google. If you are in NZ I have brushes and can copy the manual for you.

KitchenAid KSM90... | Answered on Aug 31, 2014 | 217 views I did a complete tear down and parts repair on my wife's Kitchenaid mixer. This is the site I used to get the needed parts. They were very helpful, fast and the parts worked great.

KitchenAid KSM90... | Answered on Aug 31, 2014 | 313 views

3 PointsQuestion about KitchenAid KSM90 Ultra Power Series Stand Mixer

Isn't KSM90 the model number?

KitchenAid KSM90... | Answered on Aug 03, 2014 | 187 views

You need to tell us what the problem is if you are expecting some help.

KitchenAid KSM90... | Answered on Jan 11, 2014 | 41 views

Check for broken wire under back cover, check carbon brushed under black screw covers on sides. The brushes are keyed and only work one way.

KitchenAid KSM90... | Answered on Jan 11, 2014 | 76 views

Wipe the oil up and use it. The machine has no oil in it, the grease is degrading and the oil is coming from there. It will be fine, next time it needs work done on it have them change the grease in the gearbox.

KitchenAid KSM90... | Answered on Dec 25, 2013 | 123 views

It will go back in, you just need to line it up properly. I hold the headlock in the unlock position while doing it.

KitchenAid KSM90... | Answered on Dec 25, 2013 | 62 views

Check the carbon brushes under the black screw caps on the sides.

KitchenAid KSM90... | Answered on Dec 25, 2013 | 106 views

I don't have one here in front of me but the wire colours are all written on the speed control plate, have a good look at the plate near the terminals.

KitchenAid KSM90... | Answered on Dec 25, 2013 | 54 views

Wipe the oil off and carry on. Over time the gearbox grease breaks down and oil separates from the grease solids. Eventually the gearbox will need to be repacked with new grease. Don't worry about a drip or two in a cake, it's food grade grease so harmless.

KitchenAid KSM90... | Answered on Dec 01, 2013 | 128 views

Fuse gear inside the gearbox is most likely culprit.

KitchenAid KSM90... | Answered on Dec 01, 2013 | 44 views

Remove the power and undo the brush caps on the side of the motor and check the brushes. They only go in one way, one corner is chamfered off and must be lined up with the little blocking lug inside the bottom of the brush holder. You may need a torch to look in there. I'm not so sure that this will be the solution but well worth a look.

KitchenAid KSM90... | Answered on Nov 29, 2013 | 71 views

The switch on the inner side of the black speed control board may have become bent with your repair efforts and the contacts may no longer be touching. One part of the switch contacts is lifted and lowered by the speed link that you put back to its correct position.

KitchenAid KSM90... | Answered on Nov 24, 2013 | 74 views

There is no overload switch / button on a KSM90 mixer. Please explain further

KitchenAid KSM90... | Answered on Oct 16, 2013 | 418 views

How old, what model number and witch switch speed or head lock.

KitchenAid KSM90... | Answered on Oct 16, 2013 | 93 views

Did you remove the carbon brushes. If so they go back in any of four ways. But only one way works correctly. If you did not remove the brushes then you need to set the speed timing on the speed control switch at the rear of the machine and you can find a YouTube video on this exact exercise on YouTube of course. You may have also reattached the wires to the speed control switch to the wrong connectors hence no work.

KitchenAid KSM90... | Answered on Oct 16, 2013 | 122 views

There is a spring, item #4, which hooks on to the bottom of the control plate, item # 25, and pulls it back when you move the lever to off. Remove the rear cover and see if that spring is still connected to the control plate and to the lever arm, Item # 3. Here is the diagram:

KitchenAid KSM90... | Answered on May 05, 2014 | 1,649 views

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