Question about Bosch MUM6630 Universal Series Stand Mixer

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My Bosch Universal mixer, MUM 66630, has a musty smell when I remove the lid to use the mixer.

I'm wondering if the column needs to be cleaned inside, but I don't think it is supposed to be removed. Any ideas?

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Posted on Jan 02, 2017

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SOURCE: Can't get the drive coupling off my Bosch Universal to replace it

I have had my Bosch Universal Mixer with the Blender and Food Processor Attachments since 2005, and I've loved it since the day I got it... that is, until the blender broke while my son was crushing ice to make slushies...

I figured out the "drive coupler" was stripped and needed replacing, but I couldn't figure out how to take apart the "blade assembly" which includes the "drive coupler" part...

My retailer, Pleasant Hill Grain, sent me the following email:

"I am not aware of any printed instructions for removing the old coupling and
replacing with the new. We recommend holding on to the blades with 1 hand and a
towel and using a needle nose pliers to unscrew the old coupling. You would put
the new coupling on in the same manner.
If these instructions do not work, I would suggest contacting the Service
Dept at Kitchen Resources in Utah. Their phone is 800-692-6724."

I still couldn't figure out how to take apart the blade assembly, so I did end up calling the distributor, Kitchen Resources...

Dave, the tech @ Kitchen Resources, answered my call on the first ring...

Once I explained my problem, he started giving me the same instructions Pleasant Hill Grain gave
me... I explained to him that holding the blades tightly wasn't working for me.

As it turned out, holding the blades did not secure the drive shaft because
the drive shaft was broken off INSIDE the blade assembly - which is why I could
not unscrew the old drive coupling part.

Dave's next question revealed the true issue at hand... my Blender Attachment has the blade assembly made of plastic - they switched to plastic
in 2005 because the metal assembly turned black in dishwashers.

Bosch just recently went back to using metal for this part - apparently the
plastic blade assembly didn't hold up.

Kitchen Resources - the U.S. Bosch Distributor - is sending me a new blade
assembly - no charge, he said it's covered under warranty. Woo Hoo!

Best of all, I hadn't yet purchased the replacement drive coupling part, because
I wanted to know how to go about replacing the part before ordering a new part.

With shipping this part would have been a $50+ repair - you have to love
customer service of that caliber!

[Aside: You really don't need to ever put this part in the dishwasher - wash
the inside with by putting hot water and perhaps a little dish detergent inside
the blender and turning it on - rinse the outside under the sink... no
dishwasher needed! ]

Posted on Mar 31, 2009

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Dough hook & beaters slipping


you can generally find a local repair shop that specializes in resturant/bakery equipment/small aplliance. they will have the parts you need as well.. good luck please rate this

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I want to know the ages of Bosch Mixers mum 6610 and mum 6622. I cannot find a list of manufacture dates on these two models. I want to know which one is the newest between the two and if there is anything...


Well, the advantage of Bosch Mixer mum 6610 is best for large families because of its motor speed which is really high while bosch mixer 6622 is actually amazing, with a dough hook, it has softer bread, and basically idealist for any family. These machines are made to last so the best solution for you would be to contact your supplier so that he can give you specifics but hardly are given, all the same, the bosch 6622 is fantastic in comparison.

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Never used new bosch universal plus making bread started rattling sound


I do not know a lot about this machine. I am a DIY fix anything. It sounds like one of the mounting points on either the motor or the gearing gave way. Regardless it is new, send it back & have it fixed or replaced. Sorry, I know that is not what you wanted to hear, but is safest considering your investment.

Mar 10, 2014 | Bosch Universal Plus 6 Qt Mixer With 800W...

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Bosch universal mixer 800W. How do I change a 110 volt to a 220 volt? Is it possible?


Bosch is not very good about putting manuals or other documentation online for older products, so I'll have to give you generic advice.

Some electric motors have optional voltage connections. If your motor has this feature, there will be a box or removable plate on the motor with 110 Volt and 220 Volt connections inside. You would need to replace the line cord with a 220 Volt cord having the correct plug for the location you plan to use the mixer, and connect the motor "hot" wire to the 220 V connection in the motor junction box instead of the 110 V connection (the neutral wire goes to the same neutral).

If there is no such option available on the motor, you would also have to replace the motor with a 220 Volt version. Check the labeling on the speed control (inside the mixer) to be sure it is rated for 240 VAC, and check the power label by the power cord. If the label gives a single range of input voltages spanning both 110 VAC and 220 VAC (e.g., "Input 97 V- 265 V") then you only need to change the plug. Unless the electrical parts are all rated for 240 VAC or higher, conversion is not safe.

Some products (especially desktop computers) have a recessed switch on the back that lets you select either 115 VAC or 230 VAC input power. If you have this on the mixer, all you have to do is use a small tool to push it to the other position.

An alternative is to get a 230 VAC - 115 VAC transformer or inverter rated for at least 800 Volt-Amps and wire it with a 230 Volt plug on the primary side and a 115 Volt socket on the secondary side; then you can just plug in your unmodified mixer to this. If you cannot find a box like this, you can buy a "control transformer" from an industrial equipment supplier and put it in a suitable metal box. I recommend including a power switch and a 4 Amp dual-element fuse or breaker on the primary side circuit; you don't want somebody burning up the transformer with a 1200 Watt microwave oven or griddle.

Mar 17, 2011 | Bosch MUM6630 Universal Series Stand Mixer

1 Answer

Does anyone know how I could open the base of a Bosch universal mixer MUM6N11 to expose the wires as they come into the machine.


Just take the screws off the bottom. Several need a long screwdriver to access. Then the top will lift off.

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How is speed of mixer controlled?


The little knob on the front.  It is a 5 position switch.  Off, pulse, 1, 2 & 3,   1 being the slowest.

Jul 09, 2009 | Bosch MUM6630 Universal Series Stand Mixer

1 Answer

MUM 6622 Motor Has voltage to it but will not run!


I have the same problem after running for a while, turning off then back on. It will not start. I found the heat sink fuse in the motor was burning out. When the motor gets hot then turned off, no fan and the heat build up enough to melt the heat fuse. It would be an easy replacement if I could find where to get them. To find it on the motor, look at the wire going from one corner of the motor to another, but looks like it goes into the motor in between. Pull on that going into the motor to lift the heat fuse out.

Aug 27, 2008 | Bosch MUM6630 Universal Series Stand Mixer

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