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It is most likely that the 'shear pin' in the drive system has sheared. If it was 'new' someone bought it, over-worked it, packed it up and sent it back.
That is a $10k to $20k mixer, depending on where you buy it. I have used one of these. Unfortunately, grinding noises that result in the motor stopping can be fixed with a power disconnect.
Grinding noises = dry bearings, to seized bearings, to shredded or stripped gears. You need a Hobart Service Tech.
When adjusting the screw you should be turning it out, which will make the beater closer to the bottom of the bowl, when properly adjusted you should be able to place a dime in the bowl, and the flat beater should just move it around barely. that would be about 1/16" in clearance.
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.
You are overloading the bowl or you bought this used and when they wore the motor out, you ended up with it. Batters & icings 75% bowl capacity, doughs 65% bowl capacity. If you live by this, you will buy 1 mixer & never have to replace it, especially if it's a Hobart.
I had an SM100 which did not work when I got it out to make cookies recently. So, I have both bowls available (large and small), beaters, dough hooks, whisks and the use and care book too! I sure will miss that mixer. Contact me at [email protected]
There is the possibility that if the mixer is 30 years old and it has never been serviced that the gasket around the gear case is leaking oil and in that case it would not be hard to get liquids on the armature or the stator as the gear grease in the transmission is vegetable base grease and it separates into liquids and solid and when the head is tilted up the failed gasket allows the separated oil to leak down and to the rear onto the mixer right onto the motor parts. It maybe nothing more that cleaning out all the old grease and re-packing and adding a new gasket.
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.
You need to raise the bowl just a little less than the thickness of the layer presently being left behind. Too much and the beaters will touch the bowl .
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