Kitchen Aid Pro Line 6 quart stand mixer I just purchased a Kitchen Aid Pro Line 6 quart stand mixer from a major retailer's website. I was a little hesitant after reading the numerous complaints about the plastic gearbox housing, and also by the fact that Kitchen Aid seems to have removed the Pro Line 6-qt mixer from its website.

I checked the serial number on my box (it begins with WW12) and called the Kitchen Aid support line, but the very nice woman I spoke to was unable to tell me the date of manufacture. Does anyone else have an idea if the gearbox would be metal based on the serial number? I really don't want to take the top off to check if I don't have to. Thanks!
asked by Bundtlust on April 15, 2008
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Veggiechiliqueen, please read the posts at for you question. My mixer's serial number begins with WW05 and the packing box printed 'Direct Drive - All-Steel Gear Transmission'.

I got my mixer 4 hours ago. I started the mixer but noticed some rattling noise - like some gears hiting the casting. I called KitchenAid. The representative was very nice and told me the Pro 600 Series mixer is a bit noiser than other mixer. She assured me that if the noise of the mixer is getting louder, she will ship a new one for me.

Have you gotten your rebate form?
Paul Yip answered on April 15, 2008
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Hi Veggiechiliqueen ... Just to ease your mind, The Professional 600 Series Model #: KP26M1X is listed on KitchenAid's website. I would post the link but I don't think it's allowed here. It's listed under products, Bowl-lift stand mixers on their site. HTH
TriciaM808 answered on April 16, 2008
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I have bought 3 kitchen aids in the last 20 or so years. The first one was a 4 quart I had it for over 10 years, it started getting warm when run to long so I gave it to my daughter since she didn't bake as much as I do. I then got a 5 quart I burnt that one up in about 7 years. I then purchased a 6 quart professional thinking that was the sturdiest for the heavy use I would be putting it through, it lasted 4 Years! I will never buy another Kitchen aid the quality is a thing of the past.
I have now have a Globe SP6, I use this mixer at work and know it can stand up to the abuse I will put it through. It's more expensive and a bit bigger but I know it will hold up and is sooo much more quite.
Michael C. Klock answered on December 20, 2009
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The price has now increased more than $60 on this product and a couple of accessories in two days! No apparent reason other than the assumption that anyone buying a few days before Christmas must be desperate. I'm done with the daily price fluctuation game. If I have to pay full retail then I'll buy it retail. I don't understand why prices would fluctuate daily- I think it's BS and has changed my impression of Amazon as being a reliable and trustworthy. This is more akin to ebay than the Amazon I used to deal with.
Salparadise answered on December 21, 2009
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Don't buy this is you plan on making bread. I am a trained chef who bought one of these out of cooking school. It's fine for cakes and other light duty whipping and mixing. I assure you that if you make bread it will eventually fail in the gearbox....i'm on my third mixer from these guys and it just failed after three years (mixers one and two were the same mixer, failed in warranty) I'm out of warranty and trying to decide whether I want to spend $170 to repair this dog again, or just go to the Bosch mixer that is built to handle doughs without failure.
Mark W. Furlong answered on June 20, 2010
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I owned the KA Ultra power for nearly 10 years and wanted to upgrade to the larger and stronger one so I just bought my pro 600 right before X-mas 2010, and was so ecstatic to try it out. To my GREAT disappointment, on the first batch of my yeast dough it overheated, smelled like burning electronics, and then started to smoke. I called the Kitchenaid customer service and explained what happened, and they were nice about replacing it with a new one. Again, I tried to make a yeast dough for my bread, about 12 cups of flour and running in the two lowest gears for about 3-5 minutes, it started to smell and smoke again. I called the company again and they are going to replace it again since its still brand new and under warranty. But I'm quite disappointed and I'm assuming its the common problem with this model and I don't expect much more from the new replacement. The rep told me that after the fourth replacement if it does the same thing they will refund my money back. We'll see. Kitchenaid is just not what they used to be.
Daniel Lee answered on January 19, 2011
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I read somewhere that the ser number 14 and above have the metal transmission housing and the 13 and below have the plastic housing. This information came from a KA rep in answer to a customer inquirie about this issue.
Gary Thorstenson answered on March 10, 2011
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Folks, Let me put everyones mind at ease about this metal or plastic transmission housing issue in the pro 600 mixers. First, let me start by telling you that I have 3 kitchenaid mixers, a 275 watt, a 300 watt, and I have a pro 600 comming monday. All of these mixers I bought for less than $100.00 each because they needed to be repaired, the first one I repaired in about 5 min at no cost, the second one was tougher, It took about twenty minutes to fix that one at a whopping $6.00 plus shipping, It's a black 300 watt that's only two years old and looks like new, it's running strong. My point is, these kitchenaids are so easy to fix that anyone, can repair any problem, from 250 watt up to the 575 watt mixers in about 20 min., if you only take one 10 min. coffee break. Now, let me get to the point, If you have a pro 600 with a plastic transmission cover, dont frett, were going to fix it. Get online and go to: and purchase the metal transmission housing from them for $12.99 + shipping. When I recieve my pro 600 monday, I will take it apart and write a step by step procedure to replace the plastic housing with the metal housing, then I will write it here on this descussion page for anyone to follow. I will not be responsable for any damage to your mixer, or injury you may incur to yourself. You may follow my instruction, at your own risk. If you feel like it is within your mechanical ability to complete the task, go for it, if your not sure if you can do it, take your mixer to a repair shop and let them install your new metal housing. "Problem solved". I will be back here next week to write the procedure, It's very simple.
Gary Thorstenson answered on March 10, 2011
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Looking forward to your tutorial, my wife's low duty professional 6 is making intermittent gear sounds on every revolution.
spirit answered on March 21, 2011
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Hello, Due to lack of interest from readers I decided not to write a procedure, but I will tell you how to check out the wifes mixer. First remove the chrome band,you will find 4 screws on the mixer head, simply remove the screws and lift the cover streight up, carefull not to chip the paint, set it aside, 2nd. remove the 4 screws in the black trans housing and lift it streight up, turn it over and remove the worm gear, check it for wear if it looks good regrease it and set it aside, then check the other gears in the transmission, if they look good simply regrease them and put everything back together. if you need to buy any parts, go to sears and give them your modle number and they can get your parts.

Gary Thorstenson answered on April 3, 2011
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