Rubber coupling Hi, Is this coupling the round part that drives the blades? You don't have a picture of it on your site do you. Thanks. Gene

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.

slide it over the blade ,, so that it sits between the blade base and the pitcher bottom

This is a common problem. This usually happens when either A) too many ingredients are added to the jar or B) the blade spokes do not sit properly in the coupling (the rubber piece). The coupling can be replaced easily. There is a great video on Applianceinsider.com on how to take the coupling off as recommended by KitchenAid themselves. The part can be found at 1800parts.com if you call them their reps are extremely knowledgeable and will be able to help you find the part in seconds. Or if you have the model number you can locate it right on their site.

Hi

A video for how to change this rubber coupling can be found at:
http://www.petermcinnes.com.au/images/pages/troubleshooting_18.pdf

This is the Australian website for the KitchenAid range.

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.

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.

I found this rubber drive coupling on mendshed which were helpfull enough to place it on their ebay site for shipping outside of the US. Check if it looks like yours first. One end the tapered end screws into the drive shaft the other end just fits in the rectangular shaft of the motor.

the top rubber piece could be worn enough that it is not engaging the pitcher. look at it carefully and see if the "teeth" of the rubber disc on top of the base has not cracked and worn away. a picture of the new one can be seen on the parts websites to compare I spent $10.00 for my replacement but i found them at other sites for $6.00. you will need a very skinny 7mm open ended wrench to get the old one off and it is left handed threads that means clockwise will loosen not tighten the part.i ground down my wrench but an ignition wrench from an auto store will usually be thin enough to reach the flats on the shaft under the rubber disc

This just happened to me too, and I think I just fixed it.  First you have to get a replacement part called the "blender coupling" (I got mine online from Goodmans for $3.99).  I also replaced the square drive and slinger (two parts come together for $2.99)-that's the little part that sticks up and attaches to the pitcher.
Unscrew the bottom four screws of the base where the rubber feet are.  Remove the rubber skirt to reveal four screws that hold the motor in.  They are way in there so you'll need a long screw driver.  Remove the motor and unscrew the old coupling.  Mine had not been replaced since my grandmother bought this blender who knows when, so the coupling was really stuck.  I did not have a tool narrow enough to get a good grip to apply enough torque to remove the coupling so I had to try a few other tricks.  If your blender is the same, remove the bottom nut, fan blade and two washers.  This gave enough of a rod to grip to get the old coupling off.  (I also had to use some WD40, and heat and cool the coupling a few times to break the old seal).
Good luck!  Hope that helps!

it's not easy. you will need a set of pliers, a flathead screwdriver, and a phillips screwdriver. first, remove the 4 rubber plugs from the bottom of the blender (just work them out with your fingers). second, use the phillips screwdriver to unscrew the 4 screws that were under the ruber plugs. the blender should come apart. right in the bottom center on the inside of the blender you should see a steel rod with a groove in it. this rod will run all the way to the top and be connected to the rubber gear drive on top. get a firm grip on the rubber gear drive with your pliers. place the flathead screwdriver into the groove of the steel rod and unscrew. it will be very tight, but eventually, it will give. you will most likely destroy the old rubber gear drive in the process, but the idea is to replace that one anyway. good luck!

Q. Mosley