Question about KitchenAid KSM90 Ultra Power Series Stand Mixer

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I took the two big black plastic spring loaded screws out and put them back in, now it's not working...

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Hi, ANNEQUESTRIA, I hate it when that happens. Those ‘two big black plastic spring loaded screws’ are your mixer’s electric motor brushes. The slotted black threaded plastic parts are just the Brush Holder Caps and are protective covers to the brush holder assemblies. They allow access to the brushes when they need to be replaced without have to take the whole mixer head apart. What prompted you to remove them?
From what’s been done already, still I suspect that one or both of the brushes is (are) not seated properly.
The brushes need to be installed so that they both seat correctly on the armature's commutator. See the illustration below:
I took the two big black plastic spring loaded - fd6ecd1.jpg
I'd suggest removing them again and making sure the concave contact face rests completely on the armature’s commutator. If you've turned it 90 degrees too much, it won’t seat properly and you get no power to the motor.
It would also be helpful to have the Parts List manual on hand. If you're lacking one, you can download a PDF version from the KA website at: http://www.kitchenaid.com/flash.cmd?/#/page/home.
Click on Customer Care>Locate Manuals & Guides> Enter the 6 character model number, in your case use KSM50P (Your KSM90P mixer falls within this manual), and select the last file KSM90PSWW0.pdf (354.08 KB) listed under Parts List (16) and then check to verify this matches your mixer model.
Turn to pages 6 & 7, titled “Motor And Control Parts”, which provides an exploded view for the disassembly and reassembly of your mixer’s electrical components, along with all the parts. Locate Illus No 32, Brush holder assembly that includes Illus. Nos. #18, 21, 22, 23 & 31, and Illus. No. 19, Brush & Spring assembly respectively.
The Parts List illustration along with the picture above regarding the orientation of the brushes should get your mixer powered back up and operational. Good luck! I hope this helps. Howard, Burke, VA
If this solution has been helpful to you, please rate it, thanks! -hslincoln

Posted on Feb 09, 2010

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The burshes can only be inserted one way. if they are inserted in any other orientation the brush housing will stop them from even touching the armature's commutatir. they may look like they went in however measure the amount of spring sticking out in one orientation then rotate the brush 90 degrees and stick it back in the hole. in one and only one position will the spring go further into the hole. that is the correct position. you see, there is a flat on one corner of the brush that must line up with a brass tang which will hit all three other corners preventing the brush from entering the brush holder completely.

Before inserting the brushes make sure there is no burned flour on the curved face which contacts the commutator. very carefully scrape the curvature until you are sure there is no contamination there.

Posted on Mar 30, 2010

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