Worm Gear

1, Removed trim piece (1 screw) 2, removed cover (4 screws) 3, removed speed switch assembly (2 screws) 4, removed gear cover (4 screws) 5, removed and examined 2 worm gears for wear. Gear cover was badly cracked, don"t know if it was caused by a previous repair or by heat, as old cover is plastic. Received new parts and installed them, 2 bearings, 2 worm gears, 1 new cover of diecast metal and a new gasket. All repairs made with a #2 phillips screw driver. My wife then made bread, and it preformed flawlessly.

Bought a KitchenAid Pro Series stand mixer from Sam's Club about five years ago. The transmission gears stripped. It is failry easy to replace but you need to replace the worm gear and the pinion at the same time. Make sure all the old grease is removed completely to ensure no old shavings reaming in the transmission housing. Also, if you have a fiberglass transmission housing, inspect the housing closely to indetify any hairline fractures and do not fill the transmission assembly with too much grease becasue you need room for the housing to breathe when the unit is in operation. If you fill the housing too much and tighten it, it "WILL" crack the housing. You want enough gree to keep the asssemnly lubricated but not too much that when you run the mixer that it expands and cracks the housing.

First I removed the screws that hold the silver band and the top of the mixer (cover). I removed the cover. I then removed the 4 screws that hold the gear housing and removed the housing. I removed the worm gear and removed the bearings and the washer from the "old" worm gear and put them on the replacement worm gear. I took gear grease from the cracked housing and packed the replacement gear with this grease. I attached the gasket to the replacement housing. I placed the attachment gear into the replacement housing and placed the housing over the gear assembly. I then put the mixer back together and ran it for a few minutes to dispurse the gear grease. I just mixed up some bread dough and everything seems to be in working order. I have never done this before so I hope it will continue to function properly.

Removed mixer motor housing by removing 5 obvious screws.
Removed plastic transmission cover by removing 4 obvious screws.
Down load parts exploded drawing from PartSelect.com
Found the worn part by the shiny teeth on the large gear.
Found the large worm gear on the drawing and ordered the gear, and associated bearings. Did not need the seal.
Removed worn part, assembled new gear and beargings in same manner as the worn part, and placed new part in mixer.
Replaced transmission cover gasket.
Repacked grease from transmission cover onto the new gear.
Replaced transmission cover (4 screws).
Replaced mixer motor housing (4 screws).
Replaced mixer trim band around the motor houseing joing. (1 screw).
Plugged it and and it works, good as new.

the hardest part is removing the retaining ring (didn't buy pliers)after that it is very easy, remove ring, top gear, center pin, bottom gear,worm gear(was removed first)the grease is pretty nasty,clean off the old grease and put it all back the way it came apart,with new grease.And then PRAY !!!!!!! THANK YOU PARTS SELECT for your wonder smart staff.

I took all the grease out of the top of the mixer. Saw that the gear was worn. When the new parts came I put as much grease in as was in before. Put it back together and it worked like a champ.

remov5 screws then snap ring thenn 4 screws then reploace with new parts and put back together

My husband removed screws and took top off mixer. Then he took out the gears and cleaned them from all the grease. After he did that he could see the gears that were all worn. We went on line ordered the new gears and in a couple of days the parts were here and he put them back in and greased it all again and put the top and screws back in place. Mixer sounds much quieter. Thank you.

inspected and replaced worn components

Watched several videos on repair. Noted part placement while disassembling. Found problem, ordered and received parts. Cleaned out all old grease. Greased all parts and reassembled per recommendations, paying attention to the bearing race and washer placement. Firmly tensioned all fasteners, cleaned up and tested.