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Bosch UM3 Blender drive coupling seems to be loose. The blades do not spin.

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If you are certain the coupling is defective you can purchase a new one at any local small appliance parts depot, you will require the make and model of your product.

Posted on Apr 28, 2010

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1 Answer

Why doesn't blade spin?


Either the coupling from the motor with the fingers on it is not really attached to the motor shaft or the drive on the blade that engages with it is not attached to the blade shaft. One other thing is that on some models if the rubber jar seal between the beaker and the blade carrier is in the wrong place it can raise the blade drive to not engaging properly with the motor coupling. The gasket goes between the jar and the blade carrier, not under the blade carrier.

Sep 04, 2015 | KitchenAid KSB3 Classic Work Top Blender

2 Answers

The black weel on top of the blender base that propel the blade in the bottom of the jug must be preplaced , where can I found one in south Africa?


Henzee, the part you are looking for is called the KitchenAid blender drive coupling. It is the little black rubber piece ontop of the motor base that looks like a crown with six teeth on top. The motor spins this piece which them spins the blades. It is a very common replacement part for the KSB5 blenders made by KitchenAid.

The part number you are looking for is 9704230, i am not aware of any places in Africa that sell the part but you can probably find someone in the USA that can ship it to Africa.

Here is a link to the video we have on changing the part out:
25719031-aeky52fsg5zzi2d0om5eo50t-2-0.jpg

May 29, 2015 | KitchenAid KSB5 Professional Stainless...

1 Answer

Blades on ninja blender won't spin, but motor seems to be working.


I don't have one, but inspect the shaft, it looks like there is a key on the shaft, then inspect the inside of the blade where it goes on top of the shaft, see if it looks like the shaft has spun out the blade and this is why it's not spinning.

Remove the blade and the container, then turn on and see if the shaft is spinning, it should be most are a direct drive.

So now if the shaft is spinning, that most likely means that the blade hole is broke where it sets on top of the shaft.

Look closely at the inside of the blade, you should see some type of damage like the groves are worn, I hate to see you buy one and it was the shaft that wore, but usually the blade will go first.

Mar 31, 2013 | Blenders

1 Answer

Loose blade.


mcdevito75 here, It could be a sealed bearing in the motor you here, Check online with Bosh Blender .com, contact them. Or see an appliance repair shop in yout area, if it is a bearing in the motor, a replacement blender may be your best bet.

Jul 10, 2010 | Bosch DHMUZ4MX2 Blender

1 Answer

My blender seems to spin without the glass blender "jar" in place. Once the blender is put on top, the blade will not spin.


your blade assembly is corroded. take it off, and using a rag, grab the blades. using another rag, grab the other end (probably rubber) and turn CLOCKWISE - it's threaded reverse, so you have to turn to the right to loosen, not the left like usual. I had to clean out the rod that connects to the blades - it was all nasty and corroded. I cleaned it with my Dremel and regreased with a tube of grease I keep in the garage, cleaned all other parts with some Dawn, dried well, reassembled, and works almost like new. I'm guessing I ran it too long without pulsing the motor and the heat corroded the rod that's connected to the blades. OR you can buy a replacement blade unit for about $10 online on a blender parts site

Oct 10, 2009 | KitchenAid KSB5 Ultra Power Work Top...

1 Answer

Unit seems to work fine, but when the pitcher is attached, the blade hardly spins. It seems like it is loose or something. I can manually spin the bottom piece of the blade assembly, but the blade itself...


Depending on the age of your blender, a new blade assembly may be available. I would recommend calling Kitchenaid Customer Service for pricing. Their toll-free telephone number is:

1.800.541.6390

Jul 27, 2009 | KitchenAid KSB3 Classic Work Top Blender

1 Answer

Connection between the motor and the blender unit (where the spinning takes place) - get extremely hot and blender does not seem to blend well. Motor works fine without the top - and the top seems to spin...


Replace the blade assembly immediately. They are available from Cuisinart's website. Sugars and other stuff can gum up the blade assembly over time, so it will periodically need to be replaced. A quick and easy way to keep the blade assembly clean and working longer is to put water and a drop of dishwashing soap in the blender after use and run the blender at low speed for 15-20 seconds - an old Osterizer trick.

Jul 15, 2009 | Cuisinart CBT-500 SmartPower Premier Work...

1 Answer

Broken glass jug on kitchenaid blender model 5ksb2aer4


Look at the underside of the blade shaft. The metal wing nut on the end of the shaft secures the blade assembly to cream coloured plastic blade base. The wing nut also transmits the drive from the rubber coupling on your blender to the blade shaft. The wing nut has a LEFT HAND thread.
The left hand thread ensures the blade assembly does not unscrew during normal blender use.

Firstly disassemble the blender blade assembly. Place a folded tea towel over the blades and hold the blades firmly. If you do not use a tea towel you may cut yourself.

Grip the wing nut with your other hand and unscrew it CLOCKWISE.
Remove the wing nut. You can now remove the blade from the plastic base.

Put the blade assembly in the new jug and offer up the plastic base from under the jug so that the blade shaft protudes enough for you to install the wing nut.

Screw the wing nut ANTI-CLOCKWISE to secure the blades to the plastic base.

Do not over tighten the wing nut; you may have to replace your jug again at some point.

Jun 06, 2009 | KitchenAid KHB300 Handheld Blender

2 Answers

Osterizer blender problem


Is the black plastic part, seal, and glass portion snugly fitted together? If so, it's likely that the black plastic part isn't making contact with the pin. On mine I have to turn it about a quarter turn to lock it to the motor/ drive pin.

If I have a hard object such as ice cubes too firmed placed in the blender against the blade and the glass, I shake the container to loosen the materials and reseat it onto the drive pin as mentioned above.

May 09, 2009 | Oster 4134 / 4126 Classic Beehive Work Top...

1 Answer

Can't get drive coupling off bosch unversal blender blade fixture


what you need to do is hold the blades with a towel to protect your hand, then, use a visegrips needle nose to grab the coupling (pushing the guard down) and twist it loose. It may be very tight, when I loosened mine, the plastic portion of the coupling pulled off leaving the metal "nut" tight to the shaft. Either way, remove the coupling/nut in the standard "lefty loosey" direction. Many thanks to the people at pleasanthillgrain.com for walking me through the process. Blessings to you.

Mar 23, 2009 | Cuisinart SPB-7 SmartPower Work Top...

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