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How To Repair Your Kitchen Aid Mixer Gear Box

By Dutch, Mar 25, 2011 | |
  1. Awhile back I posted about the KA gearbox blowing up. Totally my mistake. (I guess?)

    I found a parts supplier on the web "who was great" and here is the rest of the story..........

    The original picture of the "bakalite"?? gearbox housing that gave up.


    New cast aluminum gearbox housing. It is up and running. About $75.


    These are the parts that needed replacing.



    Grease cleaned out and ready for new parts.


    The new parts and tools needed. Q tips were cut and sliced to clean out the gear teeth of broken pieces. The wire thing is a sensor I bought because my mixer won't start if it is cold (below 70*). I have to take a hair dryer to it to warm it up. It is a sensor that senses motor speed ($8). I still have to use a hair dryer to start it. 


    All the gears are in and grease up. Started the motor and all worked perfectly. Then I noticed the alignment hole in the housing was plugged with part of the old bakalite housing that broke off. Out came the dremmel tool and dental picks. 15 min later the hole was cleaned. Sure wish I had noticed that broken pin earlier. In the confusion, I forgot to take the gear assembly picture.


    All in all it was a relatively simple fix. With a little patience anyone could do it.

    The reading I came across suggested (if high usage to a gearbox, change grease periodically).

    In the KA they say the unit is greased for life. If you use the attachments on the front of the motor once a week (?) (my guess) I would regrease every 3-4 years. I would also take the top off of the mixer and check to see if your gear housing is cast aluminum. If not, order a new aluminum housing and regrease the gearbox at that time and replace the housing.

    PM me and I will be glad to help you out.


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  1. wilotre
    The blowout was caused by a design flaw, plastic just can't take the abuse the hard working gears dish out. My advise to anyone with a little bit older 600KA is to open it and check to make sure they have the magnesium (metal) gear housing. If you have a plastic one, order a replacement metal one and replace it BEFORE it fails. Most of the ones we get in have major gear failure when the plastic housing goes. That equals more expense. As for greasing, we reccomend every 5 years under light to mderate use and every 3 under heavy use. Always cleans as much old grease out as possible, especially if there was gear damage, those metal grindings work like grinding compound. Remember that broken stud is almost always a factor, use a awl or dremel to clean the hole. A word of warning, if your machine seems to be getting quite warm, take a break. These motors are not repairable, if you burn it out you have to replace the whole motor.