KSB5BU4 KitchenAid Blender - Instructions

The part comes with instructions on how to replace the coupling. The instruction basically says to pry out the worn coupling. This is exactly what you should do. It might sound strange or brute force but it actually works. The coupling is actually made of some soft metal that comes out easily. The only downside is that you have to clean up the leftover metal bits. You don't need to find a slim wrench for the motor spindle as suggested by other in the thread ..... just follow the instruction pry out the old coupling.

Inserted the screwdriver under the original gear and pried it off. After that you just screw the new gear on, it has reverse threads so no tighting is required.

Just as the provided instruction says, pry-off old coupling than screw on the new. This repair was too easy! This blender was out of commission a long time, it is good to have it back in use.

I used a pair of diagonal cutters to nip away at the drive coupling which had become gummy and soft. This exposed the inner aluminum hub that the drive coupling was molded to. I used several pieces of masking tape to protect the blender finish under the drive coupling. The instruction supplied suggest to pry upward with a screw driver at 1/4 turn intervals until it comes off the motor shaft. I thought this was a rough approach, as I was concerned about damaging the threaded motor shaft. Also note that the motor shaft has left handed threads, you would turn clockwise to loosen the drive coupling. The first approach I tried was to use a small ignition wrench, there are two flats directly below the coupling aluminum hub which measured 9/32" across the flats. The wrench even though small would have to been ground thinner to fit, this may have worked. I decided to use approach two. I used my dremel tool with a 1/32" cut off wheel and cut through each side of the aluminum hub staying away from the center where the motor shaft is threaded. Across the center of the hub I only cut through half the thickness, I then used the diagonal cutters to fold each half agains itself (the hub actually fell off). I installed the new coupling turning it counter clockwise on the motor shaft. I attached the blender jar filled with water with the jar lid on and toggled the blender on and off a few times to further tighten the drive coupling.

used needle nose pliers to hold shaft after prying rubber top off. unscrewed metal tap, counterclock wise. installed new piece

Remove blender jar to get to drive cog. Use a 1/4 to 3/8 flat open-end wrench to hold cog shaft then turn the cog with your hand CLOCKWISE to loosen. Screw new cog gear on COUNTERCLOCKWISE hand tight. Reassemble your blender and you're good to go. It takes a very thin flat wrench but even if you have to buy a set the're not very expensive. Good luck.

Very easy. Enclosed instructions were excellent! Part arrived early than anticipated, also.

A very flat wrench or needle nose pliers was needed. I could not get the nut unscrewed with what I had so I had to mail the unit to a service center for repair. They were able to use the part I had purchased but if I had known I wouldn't be able to do it I could have saved a little money in the shipping I had to pay when I ordered the part.

Thanks to the good advise of those who did this before me ,I know I need a very slender wrench to get between the screwed on base of the coupling and the copy of the base of the blender.
I tried to file one myself, but the metal was too weak. Because i had the size (from what I filed), I measured and knew i needed a 7 MM wrench. I bought one at the parts store and ground it thin enough to slip into the small space and from there it was a five minute job.

Just took a screwdriver and pried off the broken coupling as the instruction said with the part. Don't stress it really works and is easy. Ordered the part on Monday and recieved it on Tuesday. Great service from Partselect!

The rubber coupling on the motor shaft was worn smooth. Easy to see the part on the drawings, cheap to buy, received it in three days normal delivery. Came with instructions that told me to pry the coupling off the motor shaft. There was no other way. I normally would unscrew it, holding the shaft or motor from turning, but that would have probably broken the motor and this time, unusual for me - I followed the 3 step instructions and it came off in one piece in one minute. Screwed the new one on and I was done. Something went right for once! A new blender would have cost $200.00. And I love to save an appliance from the city dump, to sit there and not rot, just sit there taking space for 1000 years. This is the way is used to be, and should continue to be.

Used a screwdriver to pop the coupling off snap the new one on. This was a lot cheaper to replace
than to buy a new blender.

Oy, this was. Unscrewed (reverse tread) off the old broker rubber couplin easy. Stuck a screwdriver ALL THE WAY into the motor of the blender on the bottom. This stops the blender from turningg. Screwed the new one on. Piece of Cake.

I used a previous recommendation from the repair part of the site; in which I took off the remaining rubber from the old coupling, bent the metal disk disk that remained up to allow a small pair of pliers to grip the motor's shaft, & twisted the coupling off. (reverse threading). Then just install the new coupling. It took me longer to find my pliers that to complete the repair. Lots of great tips on your site!

I read other repair stories and followed the one about stopping the motor from turning by sticking a piece of a small rod into the motor fly wheel to stop the motor from turning and then turned the coupling part clockwise and removed the old coupling then when I received the new one the next day just screwed it on counterclockwise. Was a snap and I couldn't believe I had the part in 24 hours from ordering.