4KSB5ER4 KitchenAid Blender - Instructions

with a flat wrench grab the shaft and unscrew the coupling (note: left handed threads)... then install the replacement part.

Just like the directions said, I pryed up on the coupling at a few points around it's circumference and it became loose enough to unscrew. I didn't believe it was going to work at first but, amazingly, it did. All that was left to do was screw on the new part. No problem!

Piece of cake. Part was expensive and shipping likewise. Very fast

Followed the instructions that came with the replacement drive coupler, first removeing the old part using a screw driver, and then easily screwed on the new part. Removing the old part without the aid of the instructions would have been problematic.

The replacement part arrived so swiftly I didn't know what it was until I opened the packet.

The motor drive shaft has two flanges on it that can accept a narrow wrench and the drive wheel can be screwed off clockwise!
Alternatively the drive wheel can be easily prised off and the drive wheel screwed on anti-clockwise thread.
Success
Of course if the drive wheel was made of a more durable material this would not have been a problem unfortunately typically american not made to last!

Went easy

Last time this happened we simply used a thin wrench to unscrew the damaged coupling. This time it was so tight no wrench could undo it. We had to grind it off using a grinder drill until it was so loose it popped off.

place screwdriver under old coupler and pried up on it in different spots until it popped off. Took less than 5 min. to do.

Part is left hand thread. Use screwdriver to lock motor fins and twist off part.

Used a wrench 19/64 flat

Pried the old coupling off and unscrewed the metal piece remaining then screwed the new coupling on.

I followed the instructions on the sheet that came with the replacement part. The instructions are accurate, however, the working is misleading. I think additional information is needed to make the install easier. First, a flat head screwdriver works best. Also, all the rubber that is on the broken coupling needs to be removed before trying to get the coupling off. Once all the rubber has been removed then it becomes easier to see the metal rod that holds the coupling and distance between the coupling and the base of the blender, take the screwdriver and gently pry the coupling off in an upward movement while going around in a circular manner. Then you can see the coupling rising up from the rod. Then take a hold of the broken coupling and pull it off. Then attach the new coupling, screwing it on counterclockwise. Once you realize what is going on, it's actually quite easy.

Simply followed the online video instructions. Screwdriver to remove the worn out part. Rag to clean threads. Hand tighten replacement part (reverse threads). Blender fully functional. Couldn't have been easier.

I tried turning defective coupler off after inserting a narrow screw driver into the motor fan bladed. That did not work. I then used a wide bladed flat-head screw driver to pry the defective coupler disc off the motor shaft. After prying each side over and over, the old coupler base broke free. I cleaned the remnants of the base from the threaded shaft and then screwed the new coupler on only finger tight. It went on easily. For less than $15.00 (including shipping) we now have a working blender that hopefully will last another 10 years.

I used a straight edge screwdriver. At first my husband and I were afraid to much too much force behind the old coupling, but I figured it's no good the way it was so used more force and "pop" it came off. Then installed the new one and I love my blender!!