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Models > KSM90ER4 > Instructions

KSM90ER4 KitchenAid Mixer - Instructions

All installation instructions for KSM90ER4 parts

These instructions have been submitted by other PartSelect customers and can help guide you through the mixer repair with useful information like difficulty of repair, length of repair, tools needed, and more.

All Instructions for the KSM90ER4
46-60 of 207
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1960s Kitchenaid K45 Mixer Screw Cap Stripped

  • Customer: Henry from CAMPO, CA
  • Difficulty: Very Easy
  • Time to Complete: Less than 15 mins
  • Tools Required: Screw drivers
  • 2 of 2 people found this instruction helpful
My early '60's Kitchenaid K45 mixer screw cap/base plate would no longer hold the bowl, so I looked for another. This item, though not an exact replica of the original, fit and works great. The design is better by being more stout than the original. Pretty straightforward installation: remove three screws, take out old base plate, install new plate and screw down.

Missing pedestal foot

  • Customer: Michael from CARLISLE, PA
  • Difficulty: Really Easy
  • Time to Complete: Less than 15 mins
  • Tools Required:
  • 2 of 2 people found this instruction helpful
Turned the mixer on its side and slid the part into the bottom of the base.

plastic worm gear was stripped would nut turn

  • Customer: anthony from harviell, MO
  • Difficulty: A Bit Difficult
  • Time to Complete: 1- 2 hours
  • Tools Required: Screw drivers
  • 3 of 6 people found this instruction helpful
replaced worm gear and wonderd why they used plastic instead of a stronger metal gear, unit works fine

The Kitchenaid heavy duty mixer's motor would run but the mixer head would not turn.

  • Customer: A. W. from Rogers, AR
  • Difficulty: A Bit Difficult
  • Time to Complete: 1- 2 hours
  • Tools Required: Pliers, Screw drivers
  • 4 of 9 people found this instruction helpful
Obviously the problem was in the gear box of the mixer. I disassembled the gear box by removing the four large screws holding the base then the four screws at the rear and center of the mixer. Then I removed the thin metal ring covering the five screws around the front of the housing by gently prying up with a small screwdriver. The five screws beneth the ring have to be removed with a small blade screwdriver turning them a round at a time in sequence until they are free. Gently pry the two housings apart with a screwdriver and lift our the lower half with the plantary gears. I found the drive gear was stripped. I went to PartSelect on the web, eaisly found the exploded view of the mixer's gear box and ordered the gear I needed. The gear is part of an assembly attached to the mixer housing with three screws. Work around the lubricant in the housing. Within four days I received the new gear, installed it by reversing the above procedures and the mixer is working again. The total cost was $34.85. Not a bad investment considering the mixer cost over $400 and would have been trashed for want of one part.

stripped nylon drive gear

  • Customer: James from Naperville, IL
  • Difficulty: Really Easy
  • Time to Complete: 30 - 60 mins
  • Tools Required: Pliers, Screw drivers
  • 2 of 3 people found this instruction helpful
Followed the repair instructions from the manual. ...

I did notice that the replacement part had an extension on it that allowed for the gear grease to be "pulled up" onto the drive gear ( the one that broke), while the unit is running. This feature was not on the original part, but was obviously an upgrade design which was added after my particular mixer was made. I think that the extension on the bracket will help prevent the new nylon gear from binding and stripping as we use the mixer from now on.

I'm glad that PartSelect had the more modern part on hand, and not just an "overstock" from the original, inferior design.

turn and quit

  • Customer: GARY from BECKLEY, WV
  • Difficulty: Really Easy
  • Time to Complete: 30 - 60 mins
  • Tools Required: Screw drivers
  • 2 of 3 people found this instruction helpful
Disassembled gear housing and replaced worm gear/bracket assembly. The hardest part was cleaning and working around what looked like 2 pound of grease. I will contact you again if I need parts for anything. Thanks.

no mixing

  • Customer: per from highland, MI
  • Difficulty: Really Easy
  • Time to Complete: 15 - 30 mins
  • Tools Required: Screw drivers
  • 3 of 6 people found this instruction helpful
dis-assemble, replace part, re-lube, reassemble, test good.

mixer making thumping noise

  • Customer: Roger from Custer, SD
  • Difficulty: Easy
  • Time to Complete: 30 - 60 mins
  • Tools Required: Screw drivers, Socket set
  • 2 of 3 people found this instruction helpful
disasembled found stripped gesr assembly ordered and replaced went very smoothly. It would have been good to have info and acsess to the correct gear grease to use in a mixer / food grade but it worked out well anyway.shipping was very fast thanks

Pinion gear failed, broken tooth mixer stalled and mixers wouldn't turn.

  • Customer: Michael from Palos Park, IL
  • Difficulty: Easy
  • Time to Complete: 30 - 60 mins
  • Tools Required: Screw drivers
  • 1 of 1 people found this instruction helpful
Went to partselect, found model number, printed blow-up of mixer. Figured out disassenbly procedure. Drove out main pin removing mixer head from stand. Save pin. Drove out pin in mixer main shaft which allowed planetary head to be removed. Save pin.
Removed stainless steel bezel to expose screws for removal of bottom half of mixer body. Removed screws and carefully separated mixer halves using two screwdrivers as prybars. Care must be exercised to prevent chipping of paint on body.
Separated body. cleaned grease from gears to find actual problem. Removed broken geartooth and grease near broken part to make sure no small broken chips remained. Removed pinion shaft assembly, drove pin from gear releasing broken pinion/shaft. Save pin/
Cleaned grease from pinion shaft assembly using mineral spirits and a small brush to reveal how part could be disassembled. Ordered part immediately on-line. Part arrived 1 business day after it was ordered.
Reversed process for replacing pinion shaft. Applied fresh grease obtained from excess already in mixer, spun pinion shaft to make sure grease was properly distributed. Reinstalled pinion shaft assembly. CAREFULLY plugged in mixer and jogged motor to make sure all was free and that mixer worked. If you can repair this mixer, you should have enough sense to do this diagonistic. Keep fingers away from all moving parts, don't touch expposed electric wires. Plug in only after making sure switch is in off position. Jog using mixer switch. Make sure mechanism is free.
Complete re-assembly by following blow-up and reversing disassembly steps. It may be good to write down you disassemblly procedure if it is possible that you won't be reassembling within a day or two.

pinion teeth sheared off the shaft

  • Customer: Ray from Roanoke, VA
  • Difficulty: Easy
  • Time to Complete: 1- 2 hours
  • Tools Required: Screw drivers
  • 1 of 1 people found this instruction helpful
Repair went well after I figured out how to dis-assemble the mixer. Used straight & phillips screwdrivers and a small hammer & punch to drive out 3 pins. Ordered part# PS734233 pinion & shaft as shown in the parts page, it arrived on schedule, received part # 240210-2. Only problem was the new pinion had 10 teeth, the old/failed pinion had 11 teeth. Could not learn from anyone I called at PartsSelect or Whirlpool if the 10 tooth pinion was the correct part to use.
The teeth appeared to mesh with the mating gear,
installed the new pinion, reassembled and it worked fine. Not sure if it made a noticable difference in the output shaft speed.

cap screw was worn out and would not hold the bowl

  • Customer: Frank from Locust Grove, VA
  • Difficulty: Really Easy
  • Time to Complete: Less than 15 mins
  • Tools Required: Screw drivers
  • 2 of 4 people found this instruction helpful
Removed three screws and lifted out old part. replaced with new part

The mixer would not spin so I assumed it was a bad worm gear

  • Customer: Karen from MARION, IN
  • Difficulty: Easy
  • Time to Complete: 1- 2 hours
  • Tools Required: Nutdriver, Screw drivers
  • 1 of 1 people found this instruction helpful
I watched a video on how to replace the worm gear. When I opened the mixer I noticed a small screw laying in the grease. I removed as much grease as I could and could not find anywhere that the screw would have come from. All the gears turned and looked fine so I replaced the grease put the mixer back together and it worked fine. I am thinking the small screw must have somehow fallen into the mixer when manufactured. So proud of my 70 year old self for getting the job done.

Old wire whip was broken

  • Customer: Stephanie from JACKSON, TN
  • Difficulty: Very Easy
  • Time to Complete: Less than 15 mins
  • Tools Required:
  • 1 of 1 people found this instruction helpful
Just put on the new whip...exactly like old one.

mixer wouldnt turn on

  • Customer: marc from MOBRIDGE, SD
  • Difficulty: Very Easy
  • Time to Complete: 30 - 60 mins
  • Tools Required: Screw drivers
  • 1 of 1 people found this instruction helpful
watched an internet video to see what to do. Unfortunately even after replacing the chip the mixer it still didn't work.

Mixing bowl was no longer locking in place

  • Customer: Amelia from AURORA, CO
  • Difficulty: Really Easy
  • Time to Complete: 30 - 60 mins
  • Tools Required: Screw drivers
  • 1 of 1 people found this instruction helpful
Unscrewed the existing screw cap, put the new one in place, replaced the screws. So easy!
All Instructions for the KSM90ER4
46-60 of 207