Question about KitchenAid K5SS Heavy Duty Commercial Stand Mixer

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KitchenAid Mixer is not rotating.

The KitchenAid beater shaft is not rotating. It seems like it is stuck. However the motor seems to be functioning.

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  • 235 Answers

Hi MANILYNTHEOB. I’m sorry to hear about your mixer not working. Unfortunately from the symptoms you describe, your mixer has experienced a transmission failure. You don’t mention how old your KA mixer is or how hard it’s been used, but for your particular model, KA has a plastic gear designed to fail, instead of the whole mixer ‘going up in smoke’. And what it sounds like is that this fail-safe gear finally ‘failed’ (stripped) so that the power from your electric motor is not getting to your planetary (“elliptical rotating part”) and the agitator shaft. What can you do?
The good news is that this can be fixed quite easily (OK, maybe a little effort) by yourself, if you are a DITY type person, feel adventurous, and your mixer is not under warranty you can troubleshoot it yourself. 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: http://www.kitchenaid.com/flash.cmd?/#/page/home.
Click on Customer Care>Locate Manuals & Guides> then enter the visitor type “Consumer” and then enter the 6 character model number, in your case use KSM50P (Your K5SS mixer falls within this manual), and select the first file KSM50P.pdf (438.31 KB) listed under Parts List (4) and then check to verify this matches your mixer model.
Turn to pages 4 & 5, titled: Case, Gearing And Planetary Unit for the disassembly and reassembly of your mixer, along with all the parts. Locate Illus. No. 58, Worm Gear Bracket & Gear, including Illus. No. 12, Worm Gear (23 teeth). I suspect this is the weak link in your mixers transmission and causing the problems. After clearing all the grease away, you’lll probably find that is has been stripped.
You can order a replacement gear and install it yourself. While you’ve got your mixer this far apart you can check for any other unseemly wear and tear on the on the gears and other components. Besides a replacement gear, and grease you might consider replacing the gasket, too. You should use a food-grade grease that you can order online (although I’ve seen automotive bearing grease used too – your call). Do not try to reuse any original grease as this should be filled with debris from the stripped gear.
Here are five potential vendors in no particular order: RepairClinic.com; mendingshed.com; searspartsdirect.com; partstore.com; and Grainger.com. You should search for ‘food grade grease’. Prices can vary widely between vendors, so do your comparison shopping.
It can be messy but quite gratifying to diagnose and repair your mixer yourself.
Finally, here are some links to several excellent websites that detail the disassembling/reassembly of a KA Mixer. The mixers displayed in the links are different KA models, but the principles are the same.

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, should you decide to go that route.
If you feel this repair is beyond your capability, then I would seek out a local small appliance repair shop in your area. KA Customer Care can give you names of local KA authorized repair shops in your area, but you can also do an online search to supplement what KA may provide you. Call to explain your circumstances and find out their hourly rate and get an estimate of what they think it would cost to repair your mixer. Also, always obtain three or more estimates – do some comparison shopping. Good luck, I hope this helps. Howard, Burke, VA
If this solution was helpful, please rate it, thanks! – hslincoln

Posted on Jul 09, 2010

  • jlydon Apr 07, 2011

    I assumed that the nylon worm gear had failed since the symptoms matched. Ordered new gear, took the mixer apart and discovered that the pin connecting the planetary housing to the drive shaft had sheared. As long as everything was being disassembled I checked the worm gear. It was OK. Since I had a new one anyway and more new grease than you'd need to rebuild 100 mixers I replaced it and all of the grease and am waiting for a new $2.99 pin.
    Moral of the story is check the pin first!

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easily. Do not force the beater onto the Shaft if the shaft is bent.

If it cannot be removed easily by hand, use a soft rubber mallet

(not a steel hammer) to slightly tap the beater so it can be moved

up and down the shaft or from side to side. Then you can easily

turn the beater left and remove it from the shaft.


From Kitchenaid Manual:

To Attach Flat Beater, Wire Whip, or Dough Hook

1. Turn speed control to OFF.

2. Unplug stand mixer or disconnect power.

3. Tilt motor head back.

4. Slip beater onto beater shaft and press upward

as far as possible.

5. Turn beater to right, hooking beater over pin on shaft.

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From Kitchenaid Manual:
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