Question about KitchenAid K5SS Heavy Duty Commercial Stand Mixer

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5kpm50 I have just turned the mixer on for the first time and it sounds like the bearings are 'shot' or the motor is about to freeze, what can i do?

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  • KitchenAid Expert
  • 134 Answers

If the mixer is brand new then it will be covered under a manufactures warranty. All of KitchenAid products include a one year warranty.
If you are outside the one year warranty you can either send the mixer to kitchenaid and pay for the repair, or you can fix it yourself.
The first place to start will be to take the mixer apart and find out what gears are stripped within the mixer.

Here is a link to the service manual on our website to aid you in taking the mixer apart: http://lib.store.yahoo.net/lib/mendingshed/kitchenaidservicemanual.pdf

Posted on May 14, 2013

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Posted on Jan 02, 2017

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It sounds like a thermal fuse (circuit breaker). The fuse is tripping nice it gets warm (or the mixer is stresses). These mixers don't have ball bearings, they have bushings that are oil impregnated from the factory. The oil eventually dries out or hardens if flour or other contaminants get in there. The bearings could be siezed to some degree and make the motor difficult to turn, and cause the fuse to trip.

Make sure you can easily turn it by hand (when unplugged). If you cannot, you will need to fix the cause. Or replace it if cheap enough.

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Kitchenaid mixer makes a clattering sound at low speeds - seems to be coming from the governor or the control plate - any ideas, is this a common problem and how should I approach it?


Did it start clattering before or after it was re-greased? The K5ss by Hobart is an excellent mixer and there is no reason why it can't go on for a bunch more years. First you can get clattering if the brushes are less than 5/16th inch long, But that is not usual.

I would think that the rear bearing which is in the center at the rear may be more your problem, That bearing is behind the speed control switch and behind the governor (don't discount the governor being the problem) and is attached by two 3/8th nuts and slides onto the two guide slides that hold the motor parts in place. What i have found over the years is that 1.) the studs can bend (happens but not often) 2.) the bearing which is in the center of the big aluminum housing, (Called rear bearing assembly) moves over the years and causes humming and clattering.
So what to do about it? Loosen the two nuts a turn or two (do not remove) look at the top of the the bearing assembly and you will see a metal tab (used to attach the rear cover) (make sure the bowl and beaters are not attached to the machine) now plug it in and turn it to stir speed or number 2 position, put your finger on top of the tab and press down while the mixer is running, you should hear a change in pitch, and it should effect the clattering noise, (It will go up or down, or you may hear a new noise a light humming) (The humming is caused by the armature no longer in the center of the motor field and getting to close to the stator of the motor while it is operating, when it is out of center the developed magnetic field that causes the armature to turn gives off the humming noise because it is out of center or balance) if you notice that the clattering gets louder or softer by pushing down or pulling up you have to play with it to find the sweet spot, when you find it tighten the two nuts down just enough to hold it in place and no more. It takes a while and you wont hurt the machine but never go above speed two while doing this. If that fixes the problem you may have to do it more than once as the machine continues to age or if you move the machine around a lot. the real problem is the armature needs replacing (if this is the problem). Next you may have the machine timed wrong and that has to do with the speed control switch entirely, let us know what you find if these are not the problems we have a ways to go but they are the usual culprits with your symtom.

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DORMEYER stand mixer maintenance


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Having problems figuring out what is wrong with my older d300 hobart mixer. Mixing dough the other day the agitator slowed down until it stopped, then the motor just buzzed. It did this twice and the...


Could be a bunch of different things. Depending on how old the mixer is, brushes at the back of the motor. If the brass armature is worn down I have been told its too expensive to replace. They haven't used brushes in 25 years. There are a number of bearings that could be going bad. If the main bearings at the back housing or at the gearbox are badly worn, they may be letting the armature come in contact with the windings. If that is the case the motor will be really hot when running. One obvious question is do you have the proper lubricant and have enough of it? Remove the top cover then pop the inspection hole cover off with a screwdriver. The grease inside should be the consistency of heavy wheel bearing grease. If you had a slug of it on a tablespoon it would stay on it if you turned it upside down. It is a food safe grease available at Hobart parts stores. If the lubricant is thin like motor oil, it is totally worn out and is probably not lubing your bearings at all. One other thing to look at is capacitors. A capacitor looks like a large flashlight battery shaped black object with two wires running from one end of it. It is usually located behind the mixer bowl behind a plate held on by two screws. If your mixer has a "run" capacitor, it may be bad. Remove it and head for WW Graingers or such supply house. Get a capacitor of exactly the same voltage and microfarads. Hook it back up and give it a shot.
Back to the bearings. The main motor shaft should have no play at all if you try to wiggle the shaft up, down or sideways. If it does, the bearings are available at industrial supply houses and are not realy hard to replace if you go slow and have a lot of patience in taking things apart and keeping them in the proper order to reassemble.

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If it indeed is brand new call Kitchenaid and tell them about it. They will ask for the serial number which is underneath the mixer. If it is less than one year old they will send you a new one. 800-422-1230

Make sure that the outlet you are using is good by plugging something else into it!!

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