I'm not familiar with that model number but if it is rubber with fingers sticking up then a large flat screwdriver under it and lever it up, bending it a little from 2 different sides and you should then be able to unscrew it (left hand thread I think) with your fingers. Failing that put in extra effort and wreck it off, the threaded part is aluminum and not strong enough to cause any damage to the motor shaft.
If the coupling is internal splines in a hole ask me another question.
SOURCE: Kitchen Aid Blender Rubber Coupling replacement
Someone else suggested a link that explains exactly how to unthread the old coupling... and it works. It took me about 90 seconds to fix my blender. But in case that link is dead, here's a summary:
(1) Note that the coupling (the round part with teeth) is threaded to the blender motor in reverse to a standard threading. So it screws off just like a bottle top, but in a clockwise direction.
(2) place the blender base on a tabletop, facing you. You should probably unplug it.
(3) take a punch or a flathead screwdriver, and place it against one of the coupling teeth that is furtherest away from you.
(4) strike the back of the screwdriver with a small hammer or maillot. The result will spin coupling clockwise. It may take several tries, but the coupling will eventually spin clockwise faster than the motor, and it will begin to unthread.
(5) unscrew the old coupling, and screw the new coupling into place (counterclockwise). Note that the new coupling will tighten itself every time you use your blender, so no need to worry about tightening it too much.
(6) Make a smoothie to celebrate your success!
SOURCE: I have a Kitchenaid blender
When the lights are flashing, this does indicate that an electronic part has failed. This blender is no longer manufactured, so finding replacement parts for it may not come easily. Repair centers are available. I would recommend calling Kitchenaid Customer Service to see what they can recommend for you.
Their toll-free number is 1-800-541-6390.
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