KitchenAid KP2671 Professional 6 Series Stand Mixer Logo
Posted on Apr 05, 2009
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Mixer has a broken gear or tooth in the head.

It freezer up when turning. You can definately feel it make a clonking sound and jerking when it hits this area. This is for the professional Kitchenaid Mixer.Any help would be greatly appreciated.

  • 1 more comment 
  • Anonymous Apr 06, 2009

    i have the same problem

  • Anonymous Apr 11, 2009

    Very true. I have same the problem. Outrageous

  • smurfralf May 20, 2009

    Thanks for the tips Ricardo. A couple of points I found when disassembling my 5qt Professional model: The ~3" diameter chrome ring above the blade attachment is press-on - it is not threaded and it popped off easily when struck with a light glancing downward blow by a rubber mallet. I had difficulty getting the mixer apart because its a few years old and was set. On my model you need to remove the head which holds the mixing blade before you take the 4 screws out as described above. To do that you push out the exposed set-pin. Even after I did that it was still stuck, so it came off the end of the shaft only with tapping the center of the shaft with a large punch and while supporting the round head; prying the round head from the edge is not a good idea. Alternatively you can take the four screws off and then undo the 5 screws that are under the head a couple of turns at a time as you slowly split the machine.



    On my machine the gearbox is all metal and there is one 23-tooth nylon gear that is designed to take the wear and break. Yes, it a couple of nylon gear teeth bit the dust when there was bread dough kneeding in progress. Recommended source for parts worked well.

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  • Posted on Apr 08, 2009
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Hi. You have experienced the problem that many hundreds of kitchenaid mixer owners have. No doubt your mixer began having problems while you were mixing bread or cookie dough. Kitchenaid advertises that these mixers can handle these types of dough, the brutal truth is they cannot, for one very important reason. The cheap plastic transmission housing has failed, and as a result has caused damage to your mixer's transmission.

This cheap plastic part supports two of the most important shafts and gears in your mixer and has no business being installed in a high priced mixer. Heavy doughs place enormous stresses on these gears and shafts and this plastic part is not up to the task, Kitchenaid knows this of course, but refuses to issue a recall notice.

If your mixer is still covered by warranty, call Kitchenaid's so-called customer satisfaction dept. and demand a mixer replacement with a METAL transmission housing.

If out of warranty, unplug the mixer and don't use it. Remove the silver band from around the head of the mixer, then remove the four screws that secure the cover, remove it. At the front top of the mixer locate the transmission cover, if it's made of a shiny metal, you're in luck. If it's made of plastic, examine it carefully for cracks around the mounting screws or anywhere else on the housing. If you find cracks, you have found the culprit that has caused untold internal damage to yoúr mixer

If you are up to the task of repairing it, go to the kitchenaid.com website and do a search for your model's parts catalog. Download it, it will help with the disassembly and reassembly of the mixer.

You'll need to remove virtually all of the old grease. Remove the trans. components and wipe them clean, in order to correctly assess damage. When you determine which parts need replacement, you must insist on a metal housing when ordering parts. Try mendingshed.com for parts. You can also order parts from Kitchenaid...Just be prepared to wait at least a month for them to arrive from Kitchenaid! "For the Way It's Made"?

Finally regrease with Chevron FM ALC EP-2 a Food Grade lube.

Be sure to tell the people at Kitchenaid what you think of their cheap plastic housing!

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

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Kitchen Aid 550 Pro Mixer New Worm Gear and Worm Gear Follower Issue

It would be helpful to get the model number and serial number off of the bottom of the mixer. This will help determine if the gearing has changed at all.

Usually when a mixer is making a lot of noise after replacing the gears we can find a small nick or gouge in the gear. even the smallest damage can cause these mixers to make a lot of noise. Also if you have an older mixer there was a change in the worm gear from 53 teeth to 60 teeth on the gear. If your mixer originally took a 53 tooth gear, and you replaced it with the 60 tooth gear it will make a lot of noise like you are describing.

So first check your serial number, if the first 4 digits are after WL45 your mixer would have a 60 tooth gear, however if it is a WL44 or before you would have originally had a 53 tooth gear and this is what is causing the loud noise.

If your mixer is new enough that it took the 60 tooth gear, then take the mixer apart, clean and remove all gears, clean them off with wd-40 and inspect closely, even the smallest chip can cause a ton of noise.

If you have any questions, or you cannot find the problem feel free to contact us at The Mending Shed.

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While kneading bread my mixer suddenly starting hanging up at the back side. It makes the full circle but when it gets to the back it stops and "hums" and then sometimes will go on but most of the time...

It sounds like you have lost some teeth from your worm gear. This usually happens when the mixer has been overloaded. The teeth on the worm gear are designed to fail first to prevent more serious damage. To replace the part you will need to open the head on your mixer. The gears are at the front of the mixer packed in grease. It should be obvious that the worm gear has broken once the head is open. If it is not the worm gear, with the head open it should be easy to spot the problem. The gears are available as spare parts from several places on the internet. search for "kitchenaid worm gear"
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I caught a spoon in my kitchen aid stand mixer. The mixer will not turn, and oil leaked out of the side

It sounds like you have lost some teeth from your worm gear. This usually happens when the mixer has been overloaded. The teeth on the worm gear are designed to fail first to prevent more serious damage. To replace the part you will need to open the head on your mixer. The gears are at the front of the mixer packed in grease. It should be obvious that the worm gear has broken once the head is open. If it is not the worm gear, with the head open it should be easy to spot the problem. The gears are available as spare parts from several places on the internet. search for "kitchenaid worm gear".

When you replace the worm gear, you should be able to see if you need more grease. This will have been the "oil" you saw escaping.
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I have a 325 watt K5ss, when we turn it on it make a grinding sound and there is a vibration telegraphing throught the motor housing at the top of the unit.

Hi DALDER, from the limited symptoms you’ve described it appears as though you are heading for an imminent transmission failure, if it has not already failed completely by the time you read this. Your transmission gears should not be grinding or sending errant vibrations through your mixer head when the mixer is being used.
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 is close to the point of failing. What can you do?
If you are 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> 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”, which provides and exploded view 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, check to see if the gear is just loose, exceedingly worn or broken. If it’s worn or broken you can order a replacement part 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). It can be messy but quite gratifying to diagnose and repair your KA mixer yourself.
Here are five potential vendors in no particular order: RepairClinic.com; mendingshed.com; searspartsdirect.com; partstore.com; and Grainger.com. Prices can vary widely between vendors, so do your comparison shopping.
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, repair, and reassemble your mixer.
Finally, if you feel this is beyond your capabilities and will be too difficult to do by yourself you can take your mixer to a local small appliance repair shop and have them troubleshoot and fix your mixer. KA Customer Care can provide you with the name and phone # of the closest authorized KA repair shop in your area or you can do a Online web search, but be sure to get at least three estimates before deciding to commit to one repair shop.
Good luck. I hope this helps. Howard, Burke, VA
If this solution has helped you, please rate it, thanks! – hslincoln
Dec 23, 2009 • Food Mixers
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Please tell me where i can buy the replacement

Hi, UIDA_2000, Sorry to hear about your gear issues. The inspection and troubleshooting of your mixer’s transmission is a DITY capability, particularly if your mixer is out of warranty. Just be sure to have the correct Part List manual around when you start to disassemble your mixer. If you're lacking one, you can download it from the KA website (http://www.kitchenaid.com/flash.cmd?/#/page/home).
Click on Customer Care>Locate Manuals& Guides> and enter the 6 character model number, in your case KP2671, and select one of the files that appear under Parts List file. Turn to pages 4 & 5, titled ‘Case, Gearing & Planetary Unit, for the disassembly, troubleshooting, and reassembly of your mixer, along with all the parts.
You will have to remove the transmission gear case cover to access all the gears. Then you will have to remove all the grease to inspect which gear has failed. It may be messy but gratifying. Once apart you can check for any other unseemly wear and tear on the gears, etc. You may find that it's just one particular gear that’s stripped. (The bevel gear Illus. No. 21, on my wife’s machine lost a tooth and jammed, but I was able to repair it quite easily.) Besides needing 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).
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.
Here’s a link to an excellent site for disassembling/fixing your KA Mixer. Although it’s a different model, the principles are the same: http://www.neilcrockett.com/mixer.htm and another link to a site that details the disassembly and replacement of mixer’s grease, which might be helpful, too. http://www.foodonthefood.com/food_on_the_food/2009/04/how-to-repair-a-kitchenaid-mixer-yourself.htmltl
If you feel troubleshooting and repairing 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 and have fun. I hope this helps. Howard, Burke, VA
If this solution has been helpful to you, please rate it, thanks! - hslincoln
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Mixer infected by foul demons makes bad noises

Hi, JSTEWART431, are you sure it’s the motor or could it be the transmission gears where the noise is coming from? Are you sure it's the motor or could it be the transmission?
It 'sounds' like you've got some transmission gear issues. It could be as simple as through normal use the gears have shifted slightly in the transmission and the gear teeth are making different contact, hence the grinding noise. The higher the speed, the louder, higher pitched sound you'll get. Alas, the noise may also be indicative of a potential gear failure, similar to my wife’s mixer where the mixer’s increasing noisiness finally ended with a broken tooth on the bevel gear and the mixer 'froze'.
If you are 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> Enter the 6 character model number, in your case use KSM90P, and select the first file listed under Parts List (16) 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. 36, Worm Gear Bracket & Gear, including Illus. No. 7, Worm Gear. I suspect this is the weak link in your mixer’s transmission and causing the problems. After clearing all the grease away, check to see if the gear is just loose, exceedingly worn or broken. If it’s worn or broken you can order a replacement part 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).
The next possibility to check would be with the motor itself, but electric motors are pretty simple mechanisms and generally don't fail. Using the parts list, you can see what needs to be inspected and determine if any motor parts need replacement. (Generally only brushes wear out, but I don’t think that would cause your grinding sound.)
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’s a link to an excellent site for disassembling/fixing your KA Mixer: http://www.neilcrockett.com/mixer.htm and another link to a site that details the disassembly and replacement of mixer’s grease, which might be helpful, too. http://www.foodonthefood.com/food_on_the_food/2009/04/how-to-repair-a-kitchenaid-mixer-yourself.html
If you feel troubleshooting and repairing 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 has helped you, please rate it, thanks! - hslincoln
1helpful
1answer

Mixer labors while mixing, noisy motor and inconsistent spinning

Hi CTURCOTT, sorry to hear about your mixer’s malaise. You don’t provide any information about your mixer’s age, model no., degree of usage, etc. so it’s difficult to provide you an exact answer to your question. Instead I’ll try to give you a ball park answer, and see if that will help solve your problem. Since your question appeared under “KitchenAid”, I’ll also assume that you do have a KitchenAid mixer, although all countertop mixers are functionally very similar.
It 'sounds' like you've got some transmission gear issues. It could be as simple as through normal use the gears have shifted slightly in the transmission and the gear teeth are making different contact, hence the grinding noise. The higher the speed, the louder, higher pitched sound you'll get. Alas, the noise may also be indicative of a potential gear failure, similar to my wife’s mixer where the mixer’s increasing noisiness finally ended with a broken tooth on the bevel gear and the mixer 'froze'. This would also account for your inconsistent spinning (agitator rotation).
If you are 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> Enter the 6 character model number, and select the file listed under Parts List and then check to verify this matches your mixer model.
Turn to the pages titled: Case, Gearing And Planetary Unit for the disassembly and reassembly of your mixer, along with all the parts. Locate the Worm Gear Bracket & Gear, including the Worm Gear. I suspect this is the weak link in your mixer’s transmission and causing the problems. After clearing all the grease away, check to see if the gear is just loose, exceedingly worn or broken. If it’s worn or broken you can order a replacement part 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 rest of the gears and other components. Besides needing 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).
The next possibility to check would be with the motor itself, but electric motors are pretty simple mechanisms and generally don't fail. Using the parts list, you can see what needs to be inspected and determine if any motor parts need replacement. (Generally only brushes wear out, but I don’t think that would cause your grinding sound.)
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’s a link to an excellent site for disassembling/fixing your KA Mixer: http://www.neilcrockett.com/mixer.htm and another link to a site that details the disassembly and replacement of mixer’s grease, which might be helpful, too. http://www.foodonthefood.com/food_on_the_food/2009/04/how-to-repair-a-kitchenaid-mixer-yourself.html
If you feel troubleshooting and repairing 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 and have fun. I hope this helps. Howard, Burke, VA
If this solution has been helpful to you, please rate it, thanks! - hslincoln
Nov 28, 2009 • Food Mixers
1helpful
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Under a heavy load, the mixer began clunking once per revolution

Disassembly and inspection is the only way to verify what it is. It sounds like you are correct. I have bought parts very reasonably on line and repaired our K/A mixer. The better sites ( I think I used appliancerepair.com) have exploded diagrams. If you are tearing into yours, these are invaluable, and when you get to the broken part, you'll have a name for it.

Best regards, --W/D--
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My Hobart Kitchenaid K45 clicks when under load. Any thoughts?

It could be the worm gear has lost a tooth. It could also be tha tthe beater it hitting the side of the bowl and the head needs adjusting up a little bit using the screw on the hinge.
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1answer

My Kitchen Aid mixer attachement rod won't spin when turned on.

It sounds likme you may have stripped/broken one of the gears up in the mixer head. Any competent appliance repair shop should be able to fix it.
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