4KSM50POB0 KitchenAid Mixer - Instructions

Pulled the Knob off of the new Lever then pressed it on the old Lever. I had to order the whole lever because it was the part nearest the knob in the illustrated parts break-down. I RECOMMEND THAT THE KNOB BE ADDED TO THE ILLUSTRATED PARTS BREAK-DOWN.

I removed screws in a sequence that I felt wouldn't further damage the mixer until I had it completely unassembled. When I found the broken worm gear, I went online to find a part. I found an exploded view, but the part numbering was old, and the salesperson couldn't tell me what the worm gear and bracket assembly consisted of, as I only wanted the worm gear. After trying to drive the pin out of the assembly, and failing, I decided to back online and see if anyone else had a photo of the assembly. Luckily (and wisely) PartSelect,com did and that answered any questions I had. The price was better, too. Reassembly of the mixer was a cinch with the exploded view. It's working like new, and we're hoping for another 35 years of service from it! Thanks.

My girlfriends' stand mixer failed when the accessory drive cap fell into the mixing bowl and jambed the beater, spliting the worm gear. The teeth on this gear are made of nylon and are molded to an aluminum center. This part is designed to fail in situations like this, saving the more expensive transmission parts. Following a repair manual I found online, I first removed the rear cover and pulled out the cord strain relief out from the base. Next I removed the drip cup from around the base of the planetary drive. I then used a pin punch to drive out the pin holding the planetary to the center shaft and removed the planetary. The unit was then inverted and I removed 4 screws holding the bottom cover to the gear case, and the 5 screws from around the planetary drive. The bottom cover was then lifted off. Three screws holding the worm gear bracket in place were then removed and the worm gear assembly lifted out. A small pin holds the worm gear to the shaft. I drove this out with a small pin punch and the shaft and worm gear were then removed. There is also a thrust washer on this shaft, and it's location is important. Make a note for re-assembly. The new gear was installed and the entire process reversed for re-assembly. A successful repair completed! My girlfriend would have replaced this $200 appliance, but I was able to repair it for less than $30 including shipping.

Remove one screw on rear cover. Note wire colors coming from pcb at top of assy.
Replace electronic speed control pcb. You will probably have to loosen the two screws holding the brass end plate assy to install new pcb.
Note the number of turns you loosen, so you get it back in the same position. Tighten locking nuts on screws.

This was my husband's first time to taking apart any mixer - much less a heavy duty KitchenAid. Since we could not find a local repairman, the only thing to do was try to repair it himself. Using your exploded view of the machine he found on the internet, he ordered a gasket which he felt would be needed to repair the mixer. When he tore the machine down, the problem was what he had suspected - original grease had liquified and the rest had turned black in color. He went to a local auto parts store and bought a can of wheel bearing grease. He cleaned out the old oil and repacked with about a half pound of the new grease. The most difficult part of the repair was inserting the roll pin to attach the ring gear housing to the output shaft. It was impossible for him to reinsert the original pin, so he bought a new tension pin with which he was able to work. The only part he has been unable to align is the lever to lock/unlock the machine. He managed to set it enough that it locks when the lever is pushed halfway. The machine works great but I would not advise a person without any mechanical ability to try to repair these mixers.

I removed the rear cap, decorative strap, and decorative ring. Next I drove out the pin holding the mixing head. I then removed the 9 screws holding on the motor/gearing portion. This facilitated removal of the gearing from the motor assembly. I next laid in the new gears and calculated what thickness of fiber washers were needed to hold the gears in place. Reassembly was in reverse order of dissassembly.

tossed the broken whip and replaced it with my new one. It took less than a minute.

All I had to do was clean the machine, but the missing beaters were not available at stores. I found the missing parts at PartsSelect and ordered them online. They arrived in two or three days. I had spent two days driving to different stores looking for the parts and found them in my computer. Thanks PartsSelect for great service and having obsolete parts on hand.

I unscrewed the spring latch (I could not find a screw driver- so I used a butter knife) I took the new one and screwed it on........the total time took about 2 minutes!
The best news was that the parts were delivered in 2 days after ordering!!!!!!!!! Amazing!!!!!!!!!!

Had to use a center punch to knock out tension rod, once the rod got knocked out the job is easy from here. Pull the handle out, slip the plastic sleeve over the lift arm. Attach to the bowl holder arm. Before you put the tension pin back in, make sure the bowl moves up and the arm has the right swing. I put the arm in backwards and the arm swung into the bowl. I wanted to kill myself because I had already put the tension pin back in. Fortunately I was able to knock the pin out in a few seconds and the job was done.

I removed the lower unit along with the top unit, removed the gear, replaced the gear, then put back together. I removed the grease, saved most of it, then discarded what looked like the dirty grease. I cleaned inside thoroughly in case broken parts were inside. The three schematics were very helpful in re-installed. Mixer was 40 years old but works like new!

This mixer was given to me 8-10 yrs ago with only 2 speeds (cant believe i waited this long to fix it). Repair went good, wasn't sure what i should replace so i replaced Control board, control plate, governor, grease in the gears and the transmission gasket. I first took any and ALL measurements for any screws on the control plate, this will help when you set your mixer speeds when its all back together. When installing the new governor i used a 10mm socket and a mallet to seat it all the way till it stops on the set pin. installed the new control board, with thermal grease on the back of the plate(very important). Didn't need to replace the grease in the gears, but i figured since i was in there id replace it. (No smells and all gears work) I used it to ground 5lbs of elk into burger (speed 4) after repairs and it worked great. Still have about 15lbs left to do and itll do it with out braking a sweat. Maybe i should open up a repair shop to fix these suckers...lol its that easy. What really helped with the repairs is the youtube video from Partselect. Second to none with a step by step on how to replace and repair just about anything on your mixer. Good deal, if i need to replace anything else i know where to go! Thanks

First I removed the back cover, two wires just unplugged and one wire I had to remove a screw, then put on the new wire, plug the two screws on, screw on the third wire and put the cover back on.

remove the old screw and screwed the new part in place. I like your link because it shows a picture of the fixture and you can find the part you need real easy. Will order from you again when I need it.

Once I looked at the schematic I was prtty sure what the problem was and what I needed to repair the problem. It was reltively easy to disassemble the mixer and immediately saw that I was correct in what was needed. I ordered the parts. They came through with no delay. It took almost as long to find all of the parts as it was to do the repair. In all it took about a half hour to repair, put it together and clean everything up. It works just like new.