Question about Bosch MUM6630 Universal Series Stand Mixer

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Bosch universal mixer

My mixer was working fine until I tried to mix the frosting without letting it come to room temp (after it had been in the fridgerator). I have 2 bowls: The one with the frosting in it that was forced- The bolt on the bowl now moves freely (spins around). I then got out the other working bowl. I started making cookies. At first it was ok whipping eggs and a little sugar. Then when I got a heavy load of dough, the bowl began to spin too. Any help will be greatly appreciated,I love my mixer. Thanks, Nancy

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Re: bosch universal mixer

Sounds like the belt came off when you tried to mix the frosting while it was cold. Just too much of a load. It will have to be taken apart and the belt put back on.

Posted on Aug 29, 2008

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I had (have) the same problem with mine. It would stick occasionally and then one day it wouldn't come off at all. The bowl would unlock and turn like it should but wouldn't lift off. After much time and effort I did manage to get it off and found that the splines on the shaft were scored. When I examined the receiver part, the lugs (splines?) on it were worn allowing the shaft lugs (splines) to overlap the base lugs and thus becoming jammed.

I cleaned everything completely and made a batch of bread dough and it's stuck again.

I think the base receiver needs replaced but it may be part of the transmission and maybe the whole thing needs replaced, I don't know.

I sent an email and left a message with Bosch service and will post again when I hear from them.

I have used the mixer for about 4 years and love it but this problem shouldn't happen I don't think. It seems like a design flaw to me.

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