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Bosch mfq 4020s

Plastic gear

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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...

1 Answer

Drive Shaft stopped kneading dough


To give the mixer strength it has planetary gears. Something may be wrong in the gear section

Nov 26, 2013 | Bosch 800-watt Universal Plus Mixer with...

1 Answer

Kitchenaid Mixer Planetary becomes sluggish when met with resistance.


The problem will be with the worm gear, if the gear is not stripped then check that the locating pin for the worm gear is not broken or missing. Occasionally the plastic gear can detach from the aluminium boss between plastic and shaft. The worm gear is the 99.9% place where drive can slip. Afterthought, I suppose the planetary pin is not missing or broken??

Jun 28, 2013 | KitchenAid KSM150PS Artisan Series Stand...

1 Answer

Bosch Compact Mixer Model UM 4. I am replacing the spur gear. That seems to be fine, but, like most of my projects, I now have "extra" parts. One is a foot. The other 2 are washers. The third is the...


Check this assembly diagram of a similar model.
The spur gear is part 7 and the rest seem to be washers etc around it.

Unless the rectangular block is part of the packing it may have fallen off from the one of the assemblies in the main body when you opened it. The assembly diagram could help you find the location.

Sep 01, 2010 | Bosch MUM4420UC Compact Series Stand Mixer

1 Answer

Beaters will not turn, motor runs....


They seem to have a plastic gear built in as protection for overloading (prob). When the machine counters to much resistance that gear will strip its teeth causing the machine to not be able to turn, that it what seems to be the grinding problem. If it is not the plastic gear then it another gear that is "stripped(of its "teeth") I hope your problem is not a severe, but if your mixer is "locked up" then at least you found the problem...

Hope this helped, if it did (or not) please rate, thank you!

Feb 01, 2010 | KitchenAid KSM150PS Artisan Series Stand...

1 Answer

Teeth keep stripping on the Bosch blender.


Is there a lubrication issue? Is there a bind or load to the drive after the gears? What has changed since it worked well? P{ancake batter would not be sufficient load to eat gears. Are you changing speeds under load?

Oct 04, 2009 | Bosch Food Mixers

1 Answer

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! ]

Mar 23, 2009 | Bosch MUM6610 Universal Series Stand Mixer

2 Answers

KitchenAid KSM90 gear stripped?


I just ran into this problem when the PLASTIC worm gear broke and then the mixer would not power on after I replaced the gear. The problem was due to the was I tried to dissasemble the mixer. I removed the two plastic screws near the top center of the mixer when attempting to disassemble. These do not have anything to do with the assembly it turns out the attached square pieces (attached to these screws by springs) must be in the proper orientation to run. I put them in the way it showed in a diagram but it did not work until I tried all four different combinations that they could be rotated. Two of the rotations on the square could be eliminated by closely looking at the end where it contacts the shaft. The round shaft marking will be evident on the square inserts. I'mnotsure how to better describe them, but the are attached by springs to the plastic screws on both sides of the top of the mixer.

May 31, 2008 | KitchenAid KSM90 Ultra Power Series Stand...

1 Answer

"clunking sound"


The plastic worm gear had teeth missing. I was able to order a complete drive unit ($85) from appliancepartspro.com

May 22, 2008 | Bosch 700 Watts MUM6622 Universal Series...

1 Answer

Motor runs but the beater does not move


you most likely stripped the plastic gear (Worm gear???).  This gear is designed to fail to prevent the motor from burning out under EXTREME loads (i.e. when a metal piece falls into the bowl). The plastic gear is much cheaper than a new motor.  Look around on this site to see how to get at/repair the gear.  I've found many parts on eBay.com and also PartSelect.com.

Dec 16, 2007 | KitchenAid KSM90 Ultra Power Series Stand...

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