Question about Bosch 400 Watts MUM4422 Compact Series Stand Mixer

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Sparks and large grating noise

Was using the mixer just fine, then it made a loud grating noise and the blender cap was spinning and moving up.

Posted by Peggy Stephens on

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Mark Bown

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Sounds like the gearing has gone ...

Posted on Nov 10, 2013

Testimonial: "Okay, what does that mean? Is it fixable or dead?"

  • Peggy Stephens
    Peggy Stephens Nov 10, 2013

    It is actually a Bosch UM3 model

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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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Colleen
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We Repair Anything Under the Moon!

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1. Replace both motor brushes (Black large plastic Caps on each side
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Download a copy of the Repair Part List from Kitchenaid.com for
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Also don't forget to tighten all the screws inside the mixers and use
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If this is not the problem the next stage would be to take the head apart to check the state of the gears and grease.

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