4KSB5OB4 KitchenAid Blender - Instructions

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.

Since the coupling is threaded, it can be easily screwed on and off if you immobilize the shaft. If you don't have a tool that can do this (the space between the drive coupling and the body of the blender is only about 1/8"), you can insert a long bladed screwdriver into the vents on the bottom of the blender and into the motor. When you turn the coupling, the motor won't rotate and you can easily screw off the coupling (the threads are reversed, so turn the opposite way). Good luck!
Good

followed instruction, prying off old coupling and screwed new coupling on less than 5 minutes. Parts came in a timely manner. great service, satisfied customer

Took the coupler out with the help of screwdriver and put the new coupler. really easy fix insted of buying a new blender

Removed reverse thread coupler, jammed screw driver into fan blade at bottom of mixer, installed new coupler. REMEMBER, REVERSE THREAD!

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!

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.

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.

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.

I followed the advice of others who have written their story. It is very important that you know the coupler has a left handed screw pattern. I had to use pliers the entire process to unscrew the coupler and a screw driver through the bottom between the fan blades to hold shaft. I finally had to put the screw driver -gently- as far in as possible in a position that would hold the blade.

The shaft and the coupler are threaded. On could unthread the coupler. But many time it is frozen. The coupler is manufactured out of soft metal center and plastic. If frozen, it can be pried off the shaft using a large screw driver --- per the instructions provided with the part. This worked well with no damage to the blender power shaft. The new coupler was simply screwed on to the shaft and it works fine. The online schematics provided by PartsSelect helped me identify th part, part number and the nomenclature. The part arrive on the west coas in about four day --- very quick service. Thanks, PartSelect. Great job!!!

The bottom of the coupling is threaded so that if you turn it clockwise, it just unscrews. I unscrewed the damaged coupler and screwed the new on back on.

My husband removed the old coupling and installed the new coupling with no difficulty whatsoever. The instructions included were self-explanatory and very easy to follow.

pri off the rubber,, took small center punch..taped coupling in the reverse direction....spun off and spun new one back on. Easy teesy!

Thanks