Question about KitchenAid KSM90 Ultra Power Series Stand Mixer

2 Answers

Pops out of lock under a heavy load

When kneading bread or pizza dough at no more than Speed 2 setting, motor section "bucks" and soon unlocks itself.
This bucking has caused the thumb screw to unscrew allowing both it and the cap hub to fall into the mixer bowl during the mixing process. As a result, the plastic part of the thumb screw has cracked and no longer stays screwed in (I have it taped on with blue painter's tape in order to keep debris out of the attachment hole). 

Is there something that I can tighten or adjust to remedy this problem? Can I get a replacement for the thumb screw?
Thanks in advance

Posted by on

  • susanvera Mar 10, 2009

    Mixing smaller batches of dough is not a solution. This machine, only 3 years old, used to handle a 2-loaf batch of dough with no problem, so if anyone else has a clue as to how to diagnose the machine's problem so it can be fixed, we sure would appreciate it.

  • susanvera Mar 19, 2009

    Thanks for your input, RicardoK45. I managed to mend the thumb screw using an amazing adhesive called BondWel (Yes, one L).

    Thanks for the explanation about the hinges loosening. Is that something a do-it-yourselfer might be able to fix?

    I went with Kitchenaid after trying a Sunbeam (now there's a piece of junk! It broke on the first use) upon the recommendation of a friend who bakes bread weekly, another friend who's used hers for 20 years and the positive Consumer Reports rating. I'll bookmark for future reference. Thanks for the link. That oil leak business that so many have experiences is concerning.



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Hi Susan. There is no worse feeling than the feeling you get when you find that you've been seperated from your hard-earned money by a company that markets a product with glowing phrases of what their product can do...And then doesn't deliver on it's promises. Kitchenaid mixers can make short work of bread dough NOT! My Kitchenaid HD Pro (475 watts) self destructed after only 30 uses of making my Sourdough Bread. The problem? A cheap piece of plastic that takes the stresses of two important shafts in the mixer. Cheap, shoddy parts in a mixer you paid top dollar for. Kitchenaid shows no shame in doing so.

What is happening with your mixer as it tries to mix your dough is that the head unit is thrust back and forth and side to side (bucking). Eventually hinges become loose and sloppy. Kitchenaid's behaviour is legal and beyond reproach, so make your next mixer purchase an informed one.

Goto and do a search for your Kitchenaid model. You'll notice that you're not alone in your mixer troubles.

I solved my mixer problems by buying a used Hobart 20qt. Commercial mixer (A200) and rebuilt it. When mixing heavy dough you should only use about 60% of the bowl capacity. less, if your mixer is agonizing with the amount of food in the bowl..

You will be able to replace the thumb screw. Be prepared to wait for at least a month for the part to arrive once ordered.

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

Posted on Mar 19, 2009

  • Rick Belanger
    Rick Belanger Mar 19, 2009

    Hi again Susan. Take your mixer to an authorized repair center. Tell them about your problem. Ask if they can fix it. If they say "we can try", just walk away and start looking for another mixer. If they say they can fix it, get a firm quote from them and ask how long their warranty is on parts and labour. If they are "Iffy" on the subject, walk away.

    Your Sunbeam, if it lasted long enough, would have done the same thing. My Sunbeam did, which is why I bought a Kitchenaid based on their "Good Old Brand Name" and their marketing Lit. They lied about how much flour it could handle. I believe that All the manufacturers lie about their products, simply because they can get away with it. There are no watchdogs for the consumer's rights.

    I don't think that your mixer can be repaired, I think that the hard mounting points for the hinge and lock have been forever re-shaped by the constant pounding of the bucking motion.

    I think that if you're going to make bread, you're going to have to invest in a good quality commercial mixer. The only one I can recommend is Hobart, and not a new one either. Hobart was sold to ITW around 2000. The Kitchenaid line was sold to Whirlpool Corp. about the same time. The new "Legacy" Line from Hobart is not of the same overall quality as the old ones. The older Hobart's can be found on eBay, or through a local used restaurant equipment Supply place locally. Parts are readily available for the newer machines. There is not enough space here to educate you on all of the things to look for when buying a used Hobart, but I'll give you one important one. Look for a used Hobart mixer that has a round black knob on the gearshift lever, this will indicate a somewhat newer model that may not have it's insides worn out yet. If possible try the mixer out in all gears. Be sure to turn off the mixer before attempting to shift gears.

    If you find a good candidate for your next mixer, it may be worth your while to hire a Hobart tech to take a look at it and give you an asessment on it's condition. If the current owner will allow it. Have the tech take off the two dust covers on the transmission housing and take a look for the amount and quality of the grease inside. Very low grease = excessive wear on the upper gears. Excessive oil=grease worn out, must be replaced. Check the nut on the planetary, if oil drops are present that means that the seals will have to be replaced. Hobart's tech. labour is approx. $100.00 per hr. and parts aren't cheap. Ideally, if you could find an A200 (20 qt. mixer) or an N50 5qt. from a school that would be the peach, as these mixers aren't run hard and all of them have been on a service contract and have not been worn out. I have it on good authority that all schools are upgrading their kitchens. So check out your local schools first. You could get real lucky. Even with a 20qt. bowl you can only load it up to 60% of the bowl's capacity (for heavy bread dough). If it does not come with an "ED" dough hook get one, as it will do all the kneading right there in the bowl. Finally! Good luck! You're going to need it. ricardok45

  • Rick Belanger
    Rick Belanger Mar 19, 2009

    Hi Susan. Re: the oil. Kitchenaid recommends that you turn on your mixer once a week to keep the oil in suspension in the grease. Over time all greases will separate. If you find a mixer that suits your needs, I'd suggest re-greasing it with Chevron FM ALC EP-2 grease. This product has a Mineral Oil base and is rated as a food grade grease, meaning that a few drops in the bowl are OK. Not so with other greases which are petroleum based. Seals on mixers are designed to hold back grease no oil, so the presence of oil means servicing is necessary. Hope this helps. ricarok45


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Kitchenaid parts on line, try mixing smaller batches of dough

Posted on Mar 09, 2009


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