Question about KitchenAid KSM90 Ultra Power Series Stand Mixer

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Speed selector is fussy, and a short has occured

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CCFSILVER - When you say your speed selector is fussy, do you mean fussy in a 'electrical' sense or fussy in a 'mechanical' sense? Also, you didn't say if the short is causing power to the motor to be cut or what specifically the short is doing. For now I'll assume that you mean 'fussy' in an electrical manner. That being said, the speed selector is fixable. If your mixer is under warranty, contact KA and ask them to remedy the problem. If it is not under warranty, then you can attempt to fix it yourself. This will not be for the weak of heart, as you have to disassemble your mixer. It that is not within your capabilty than you should take the mixer to an authorized KA repair shop in your area. If you think you can do it your self, great!
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. If you turn to page 6 you will find the exploded view of the motor and the speed control. I suspect your fussy selector issues are being caused by Illus Nos. 24, 25, or 27 (the Governor Assembly, the Control Plate Assembly or Phase Control Board, repsectively). I would order all three parts on the assumption that if one has gone bad, the others aren't far behind. As far as parts go, here are four potential vendors in no particular order: RepairClinic.com; mendingshed.com; searspartsdirect.com; partstore.com. Prices for the same part may vary widely between vendors, so do your comparison shopping.
Good Luck, I hope this is helpful. Howard, Burke, VA

Posted on Nov 19, 2009

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Obtain a copy of the KSM150PS Repair Part List from Kitchenaid.com.
Remove the screw holding the End Cover and locate the three screws from the Control Plate.
All three (2 top left and right, and 1 bottom) must be adjusted.

1. Loosen the lock nuts enough & Turn the 2 top screws clockwise until they cannot be turned
anymore. Leave the bottom screw alone for now.
2. Use a dab of white paint or paper whiteout to mark the positions of the Phillips screws.
3. Plug in your mixer and Set the speed selector to "Stir".
4. Turn each top screw One full turn couterclockwise (alternating between Left and Right)
Keep making one full turn at the time (for both left and right) until the motor starts running.
5. Put your hand near the Agitator shaft and allow it to brush your finger slightly. Use your
watch or clock and start counting the number of times the shaft touches your finger in
60 seconds. The correct count should be 60 RPM (Rounds Per Minute). If it is less
or more than 60, give each screw 1/4 turn counterclockwise or clockwise and start counting
again. Now tighten both lock nuts.
6. Set the speed selector to "6" and turn the bottom screw either clockwise or counterclockwise
to achieve a speed of 180 RPM.

For your reference, the planetary RPM's for the 5-qt. tilt-head Artisan Stand Mixer are as follows:
Stir speed - 60
Speed 2 - 95
Speed 4 - 135
Speed 6 - 180
Speed 8 - 225
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1 Answer

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must all be adjusted. Here is how:

1. Loosen the lock nuts enough & Turn the 2 top screws clockwise until they cannot be turned
anymore. Leave the bottom screw alone for now.
2. Use a dab of white paint or paper whiteout to mark the positions of the Phillips screws.
3. Plug in your mixer and Set the speed selector to "Stir".
4. Turn each top screw One full turn couterclockwise (alternating between Left and Right)
Keep making one full turn at the time (for both left and right) until the motor starts running.
5. Put your hand near the Agitator shaft and allow it to brush your finger slightly. Use your
watch or clock and start counting the number of times the shaft touches your finger in
60 seconds. The correct count should be 60 RPM (Rounds Per Minute). If it is less
or more than 60, give each screw 1/4 turn counterclockwise or clockwise and start counting
again. Now tighten both lock nuts.
6. Set the speed selector to "6" and turn the bottom screw either clockwise or counterclockwise
to achieve a speed of 180 RPM.

For your reference, the planetary RPM's for the 5-qt. tilt-head Artisan Stand Mixer are as follows:

Stir speed - 60
Speed 2 - 95
Speed 4 - 135
Speed 6 - 180
Speed 8 - 225
Speed 10 - 280



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1 Answer

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Sorry if this is redundant, but info posted to another problem works here as well:

KitchenAid has one of the best user forums of any company as far as I'm concerned. The participants are great and the monitors are exceptional (some of the best problem solvers you are likely to run across). You may find your experience already has a thread, if not, post it. I checked in and they seem to have added a video library that has some of the topics I've seen posted at this site.
http://www.kitchenaidconversations.com/

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