Question about KitchenAid KSM90 Ultra Power Series Stand Mixer

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I took out both the electrical brushes while cleaning my KSM90 and I think I re-inserted them incorrectly. I unscrewed each cap and took out the spring and brush, cleaned the female threads, and the male threads on the cap, returned the spring and brush assembly, and then screwed each back cap back in. No response when I turn the machine back on. How do I know which way they should the brushes should face? They do not seem warn enough to require replacement, since both have about 3/4 of an inch of the carbon material left. Each is worn to a curvature, but I don't have a diagram that can tell me which way the part of the motor is rotating as it touches them. Thanks!

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Hi REDEN828, yes, you are correct. When you reinstalled them you either misaligned one or both brushes so they are not seated properly on the motor's armature. See the illustration below:
I took out both the electrical brushes while - ecc681e.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, the brush 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 #18, 21, 22, 23, & 31 which is the brush holder insert, and Illus. No. 19, brush & Spring assembly respectively. The 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 Jan 31, 2010

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May 05, 2011 | KitchenAid KSM90 Ultra Power Series Stand...

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How to replace motor brushes? I only can take the small springs after unscrewing the caps on both sides. The carbon brushes are still inside? Tell me how to take them out and just put new brushes with...


I believe the brushes and the spring are one piece, so the brush should come out with the spring. Either the brushes are so worn that you just aren't noticing the little bit that's left, or the block has come loose from the spring. You can tip the machine over so the brush hole is facing down and let gravity do the work. If there's any brush left inside, it should slide out. Otherwise just install the new brushes.

Dec 14, 2010 | KitchenAid KSM90 Ultra Power Series Stand...

1 Answer

I took off the back cap of a 300 mixer. then pulled out the motor brushes. put it back together and now it wont run. What am i missing?


Hi, KIMAMABELL, While working on your mixer be sure 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, KSM90P, and select one of the files listed under Parts List (check to see it 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 that includes #18, 20, 21, 22, 23, and 31 which is the brush holder and brush & Spring assembly respectively.
The brushes need to be installed so that they both seat correctly on the armature's commutator and it’s possible when you reinstalled them, one or both brushes were turned incorrectly.
The illustration below shows the correct orientation of the brushes and should allow you to reinstall them with confidence.

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Here are some links to several excellent websites that detail the disassembling/reassembly of a KA Mixer for your future referennce.
Between these three websites and their excellent pictures and descriptions and your Parts List manual, you should now be able to completely disassemble and reassemble your mixer.
Good luck! I hope this helps. Howard, Burke, VA
If this solution has been helpful to you, please rate it, thanks! - hslincoln

Apr 29, 2010 | KitchenAid KSM90 Ultra Power Series Stand...

1 Answer

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You don't need to seat the brushes. Remove the brush caps and pull the brushes out by their springs, being VERY careful to note the position of them since they only go back in one way. Measure the free length of the spring before pulling it out. It is critical that you write down the length sticking out with very slight pressure on it so that it is seated against the armature when you measure.

Clean the curved surface of the carbon brushes with a sharp knife being careful not to scratch the curved surface. If you have them installed wrong they will not go all the way in and will not contact the armature and it will not run. Measure the length, as done above, of the spring to make sure it is in correctly!! If it is not in correctly the spring will stick out 1/4 inch longer than it should.

Apr 21, 2010 | KitchenAid KSM90 Ultra Power Series Stand...

1 Answer

No power after replacing worm gear in Kitchenaid KSM90 Mixer


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.

Mar 31, 2010 | KitchenAid Food Mixers

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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...


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:
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

Feb 07, 2010 | KitchenAid KSM90 Ultra Power Series Stand...

1 Answer

Problem for KitchenAid 300 Watts KSM90 Ultra Power Series Stand Mixer Motor will not operate


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Thanks

Oct 30, 2009 | KitchenAid KSM90 Ultra Power Series Stand...

1 Answer

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sm_schedule, the side bolts you removed were, in fact, the brush holder caps, and if you remove the brushes, you cut off the power to the electric motor (armature). I suspect that one or both of the brushes is (are) not seated properly. Did you remove the brushes to replace them or were you just inspecting them? I'd suggest removing them again and make sure the concave contact face of the brushes are resting completely on the armature. If you've turned a brush 90 degrees too much, it wont' seat properly. As far as adjusting the mixer head so that it doesn?t droop, this should be pretty easy to fix if you?ve got a small blade screw driver and a small hex driver (or jewelers screw driver). First, do you still have the KSM90 Parts List? If not, you can download a PDF version from the KA website. Click on Customer Care>Locate Manuals & Guides> Enter the 6 character model number (in your case, use KSM90P) and select one of the files that appear under Parts List. Turn to page 4 - Case, Gearing and Planetary unit, which shows the exploded view diagram and locate Illus. Nos. 29 & 30. Page 5 lists the parts as Adjusting Screw and Set Screw respectively. What?s probably happened is that over 12 years of operation, the vibrations from your mixer has caused the set screw to loosen and drop, hence the lower mixer head. Both screws will need to be ?adjusted? to move the head back to its original position. Now the problem is removing the head from its pedestal. Turn to page 8 and gently remove Illus. No. 7, Hinge Pin, with a hammer and pin driver. With the hinge pin removed the mixer head and pedestal can be separated and you should have access to adjusting and set screws. I would inspect them for wear and tear, and replace them, if you deem appropriate. It may take a few trial reassemblies to get the mixer head back to the original factory position, but once there, everything should be OK. I hope this helps! Howard, Burke, VA

Oct 21, 2009 | KitchenAid KSM90 Ultra Power Series Stand...

1 Answer

DONT WORK


Hi. Before you get too far, call kitchenaid parts to find out if they still have parts for your mixer. They no longer show a parts list for the KSM90 so your mixer may end up in the trash.

Go to mendingshed.com and select the Kitchenaid products button then select Kitchenaid mixer parts. Near the top of the page locate the button for the free kitchenaid service manual. Download the manual and read about the disassembly and reassembly of your mixer.

This manual does not cover your mixer but is a usefull tool for working on any mixer. Good luck with it.

If this solution has assisted you, please rate it. ricardok45

Apr 18, 2009 | KitchenAid KSM90 Ultra Power Series Stand...

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