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Introduction

If your mixer won't spin or is noisy, follow our guide on how to replace the worm gear.

  1. Using a spudger, gently pry off the aluminum drip ring. Using a spudger, gently pry off the aluminum drip ring.
    • Using a spudger, gently pry off the aluminum drip ring.

    Unplug the Mixer.

    Mike Reckner - Réponse

    Good call! Nobody likes digital trauma

    David Brand - Réponse

  2. Using a 4 mm pin punch and hammer, hammer the pin until it is dislodged from the planetary gear cover.
    • Using a 4 mm pin punch and hammer, hammer the pin until it is dislodged from the planetary gear cover.

    This should be a 5/32 inch or 4mm punch.

    Patrick Hailstone - Réponse

    For mine it is so stiff and I cant put out the pin with hammer

    Omid - Réponse

    The pin is not moving: is there any other way of removing it or completing the job without removing it?

    ollver - Réponse

    My pin is stuck too, are there any other ways?

    Nabil Baker - Réponse

    Can the pin be hammered from either side. It won’t budge

    Sally Stier - Réponse

    Just keep at it, mine didn’t budge for a while

    Robert Chauharjasingh - Réponse

    No way. I ‘ve tried for an hour and it didn’t move at all. But I ‘ve found a solution. I drilled it out. First with 2mm then with a 3mm drill. Then I could easily remove it. The replace part is a 4mm x ~22.5mm grooved pin (half-length-center-grooved; ISO 8743).

    Zwiebeljack - Réponse

    Mine was also stubborn. I laid the machine on the side and sprayed WD-40 in the pin several times. Waited 30 min and then it came out easy.

    Petter Hellevik - Réponse

    If you need to buy a pin punch set, get ones with knurled handles (crosshatching of the metal) which are much easier to hold onto. I had to try one side then the other and WD-40 to get it out. Also figure out to how to position the mixer and what lean your hand agains while holding the pin to keep it steady so you can make multiple, accurate strikes.

    When re assembling, when it came to aligning everything, i found using a small pin punch to poke all the way through helped. Then i started in on hammering the pin back in.

    Linda Przybyszewski - Réponse

  3. Using a spudger, pry the planetary gear cover from the mixer shaft. Using a spudger, pry the planetary gear cover from the mixer shaft.
    • Using a spudger, pry the planetary gear cover from the mixer shaft.

    My spudger must have been cheap, it bent, so i wrapped a flat sided screwdriver in a rag instead.

    when reassembling, the alignment can look and feel almost be correct but the shaft wont come out far enough to let you out the pin back in, i needed to take off twice and then it slid in perfectly and everything in the rotation moved much more easily

    Linda Przybyszewski - Réponse

  4. Using a flathead screwdriver, remove the five 28 mm front motor housing screws.
    • Using a flathead screwdriver, remove the five 28 mm front motor housing screws.

    • Using the same flathead screwdriver, remove the two 28 mm locking screws.

    • One of the locking screws contains a safety locking mechanism. Do not interchange these screws with the front motor housing screws.

    Hier Werder mittlerweile Vierkantschrauben in 3/32 Zoll verbaut. Wie bekomme ich die auf?

    Chris - Réponse

    Classic Plus uses a square-drive screw. You’ll need #1 size.

    Robert Kyle - Réponse

  5. Turn your device around. Using the same flathead screwdriver, remove the two 28 mm rear locking screws.
    • Turn your device around. Using the same flathead screwdriver, remove the two 28 mm rear locking screws.

    • One of the rear motor housing screws contains a safety locking mechanism. Do not interchange these screws with the front motor housing screws.

  6. Using a Phillips #2 screwdriver, remove the 10 mm screw from top of back cover. The rear cover is now completely free from the mixer.
    • Using a Phillips #2 screwdriver, remove the 10 mm screw from top of back cover.

    • The rear cover is now completely free from the mixer.

    When I removed this, 2 nuts were in there lose. I cannot tell where they came from.

    Nila Tae - Réponse

  7. Carefully pull the power cord from the notch in back of the mixer. The motor housing cover is now completely free from the base of the mixer.
    • Carefully pull the power cord from the notch in back of the mixer.

    • The motor housing cover is now completely free from the base of the mixer.

    For the KSM90BU model, take a set of needlenose pliers and carefully rotate the plastic clip 90 degrees, then pull the cord out of the notch.

    Charles Lester - Réponse

  8. Lift the motor housing cover from the mixer base.
    • Lift the motor housing cover from the mixer base.

    • Be sure to place the cover upside-down to prevent grease from leaking out.

    Und wie komme ich nun an den Motor zur Reinigung des Unterbrechers?

    Arbeitsgruppe Dialog - Réponse

    ich habw eine 5KSM150, leider lässst sich die Motorabdeckung nicht entfernen, alle vorhergehenden Schritte wurden wie beschrieben erledigt

    kann hier jemand helfen?

    Marius Quaschinski - Réponse

    Hi all, for your information: I also have the model 5ksm150 and managed to remove the top of the machine with a lot of effort, wiggling back and forth until it came out. That worked after about 10-15 min :-) Now the good mixer works again!

    Francois - Réponse

    Any tips for doing this? It’s very stuck!

    Marina Juarez -

    I cannot remove the housing cover… it is stuck. Any tips?

    Marina Juarez - Réponse

  9. Using a butter knife or putty knife, remove the grease from the gears. Place the grease in motor housing cover.
    • Using a butter knife or putty knife, remove the grease from the gears.

    • Place the grease in motor housing cover.

    Gib das Fett AUF KEINEN FALL in das Motorgehäuse zurück. Die KA ist werkseitig mit mit einem Fett befüllt, welches schnell altert und sich in teilweise verflüssigt. Auch bei dieser Maschine ist zu sehen, dass es bereits an der Dichtung vorbei austritt. Wer sich schon die Mühe dieser Reparatur macht, sollte die Gelegenheit nutzen, auch das Fett zu tauschen. Es sollte ein verseiftes Fett der NLGI Klasse 2 sein. Sehr vorsichtige Menschen können ein lebensmittelechtes verwenden.

    Marc Malkwitz - Réponse

  10. Using a Phillips #2 screwdriver, remove the three 20 mm screws from the worm gear tower.
    • Using a Phillips #2 screwdriver, remove the three 20 mm screws from the worm gear tower.

    • The worm gear tower assembly is now free from the mixer base.

  11. Using a pin punch and a hammer, remove the roll pin. Using a pin punch and a hammer, remove the roll pin.
    • Using a pin punch and a hammer, remove the roll pin.

    this did not work for me. I could not remove that splint, whatever I tried. In the end the splint was damaged and I could not continue. Had to bring my Kitchen Aid to a professional service. Sorry guys, the description is fine until that point, but this one step does absolutely not work.

    udoschwartz - Réponse

    I used a 1/16th inch pin punch, i think the hard thing is positioning the piece so you can strike accurately

    Linda Przybyszewski - Réponse

  12. Slide the tower gear out to access the worm gear.
    • Slide the tower gear out to access the worm gear.

  13. Remove the worm gear from the tower.
    • Remove the worm gear from the tower.

    Helpful pictures

    Dawn - Réponse

    This also works for the KSM90BU model

    Charles Lester - Réponse

    Excellent instructions!! Pictures were very helpful. A total novice and I fixed my mixer in 35 minutes. Thanks!!

    Jo Hasselman - Réponse

    There are washers either side of the worm gear. Mine were covered in grease and stuck to the old worm gear and very easy to miss, so don’t throw them out!

    drteeth - Réponse

Conclusion

To reassemble your device, follow these instructions in reverse order.

39 autres ont terminé cette réparation.

Chris Grant

Membre depuis le 07/10/2014

1 152 Réputation

1 tutoriel rédigé

Équipe

Cal Poly, Team 14-28, Maness Fall 2014 Membre de l'équipe Cal Poly, Team 14-28, Maness Fall 2014

CPSU-MANESS-F14S14G28

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14 tutoriels rédigés

24 commentaires

Some corrections:

Step 1 -- Suggest (as the Service Manual does) using a flat-blade screwdriver and tap it with a light hammer to drive the drip ring off.

Step 2 -- the correct size pin punch is 5/32"

Step 3 -- Using two flat-blade screwdrivers, one on each side, pry off the planetary.

A plastic spudger is likely to break. Two points of leverage opposits each other distributes the load and prevents to the planetary and its shaft.

Step 11 -- The proper punch size is 3/32"

Steps 12 & 13 -- There is a washer on each side of the worm gear. Retain these and place one on each side off the grar when reassembling.

A link to the Service Manual:

http://www.kitchenaidparts.eu/documents/...

Finkerbell - Réponse

Cheers Finkerbell,

Very helpful info, as was the main part of the guide.

Not sure what model number I was working on, but when I l lifted off the motor housing, there was still wires connected to the base.

Just be careful at this stage in case you have the same...

markguerin - Réponse

my model K5SS WH is the same as yours until step 5. It doesnt have the two bolts as shown in the picture for step 5 so i wasnt able to complete the repair. any suggestions.

sailsetter - Réponse

Wow! Lovely guide to easy maintenance, no plenty stories

Dennis - Réponse

This is the BEST! Thank you.

Advanamics - Réponse

is there any chance of using stronger gears as replacement parts?

rslaughter65 - Réponse

You shouldn’t want to, this plastic gear serves as a kind of mechanical fuse to protect the motor from failure. If the system is overloaded (or worse freezes to a stop) the gear will shear off protecting the motor from overload. This part was not designed as “planned obsolescence” as the rumor states but was actually a safety feature as an easily accessible and cheap plastic gear is a much better replacement than a motor.

PedroDaGr8 -

I can't punch the pin out. Any ideas?

Denise Olson - Réponse

Denise,

I had the same problem.  Knocking the pin out looks so easy in the videos, but was not so in my case.  I put the mixer on the floor and butted the side up against a wall, with a towel for padding between the mixer and the baseboard.  Another option would be to lay the mixer on its side on a board and a towel for padding.  The idea is to keep the mixer from moving when driving out the pin.  You may also try applying some WD-40 to each side of the pin.  I used a large nailset, which slipped less than the punch, and just kept tapping on the pin.   I used more force each time until the pin started to move, and then maintained that force until the pin was out.  Driving the pin back in was equally as difficult.  I added some grease to the pin when reinstalling, but I am not certain that it helped any.  Good luck!

Craig -

FYI - The motor would hum on my mixer, but the mixer would not spin. I followed this guide under the impression that the gear was trashed, but upon disassembly found that the gear was in good shape.  It turned out that gear at the front of the blender that powers attachments was stuck.  With the mixer still disassembled,  I removed the front cover (the chrome piece at the front end), and used a punch to drive the gear back into the blender so it could be removed.  Simply cleaning gunk off of the gear shaft and the bearing with steel wool, applying some light grease, and reassembling, fixed this mixer.

Craig -

RE: Introduction : This may be terribly obvious/nit picky, but you might need the replacement part before doing this. Saying you need no parts seems pretty silly. Other than that these directions are very useful/good.

maineuropa - Réponse

I had expected to see a toothless plastic gear in the grease, but alas, what I did find was the small metal tower gear was missing more than half of its teeth! The plastic gear appears intact. I was able to find 3 of the teeth in the housing, but I fear the other 3 or 4 are lost in the grease blob, so I will have to purge the whole mess and start over. The larger main gear might also be damaged; I haven’t gotten that cleaned up yet, but all its teeth are present. Beware old crystalized brown sugar lumps!

Tim Fowlks - Réponse

The disassembly instructions are quite good, by the way. Thanks a bunch!

Tim Fowlks - Réponse

Buy a better mixer next time that doesn’t use a cheap gear, don’t catch KitchenAid’s

Terry Vanderpuke - Réponse

Any recommendations for the type of gear lube?

nshourds - Réponse

Just found it: KitchenAid recommends using any food grade lubricant to grease the gearing. Such as this one: https://www.amazon.com/Grade-Grease-Kitc...

nshourds -

Works for 5KPM5EWH too! Thanks!

Felix Büchler - Réponse

For those having trouble with the pin here’s a workaround:

Skip steps 2 & 3. In step 4 you should be able to loosen the screws quite a bit before they hit the top of the planetary gear cover. Proceed through step 7 and now you should be able to wiggle/pry the top up until the front screws reach their limit, at which point you can continue to remove them completely.

Dan Jabbour - Réponse

hello I got to the point of removing the roll pin in the worm gear and can not get the roll pin to punch out any suggestions…on specific tool I can use my punch did not work and seems to be flattening the rol pin

Lisa A Hypnar - Réponse

To remove pin on the worm gear, start with a tapered punch. Brace the tower on a firm board. I clamped the gear very very lightly with vice grips to maintain a vertical alignment. It was not easy. Once the pin moves 1/8”, switch to a regular punch. Before the pin is fully extracted. Rotate 90 deg and finish punching it out. To reuse the pin, I filed the pin deformities carefully, lubed and pressed in with channel locks.

But…save time, buy the whole tower.

C Bosworth -

Bitte nicht das alte Fett wieder verwenden! Die Kitchen Aid ist werkseitig mit mit einem Fett befüllt, welches schnell altert und sich teilweise verflüssigt. Auch bei dieser Maschine ist zu sehen, dass es bereits an der Dichtung vorbei austritt. Wer sich die Mühe dieser Reparatur macht, sollte die Gelegenheit nutzen, auch das Fett zu tauschen! Es kann jedes verseifte Schmierfett der NLGI Klasse 2 verwendet werden. Sehr vorsichtige Menschen können lebensmittelechtes Schmierfett verwenden.

Please do not reuse the old grease! The KitchenAir is factory-filled with a grease that ages quickly and tends to liquefy. The photos here show, how grease leaks past the seal. Once you do the effort of this repair, take the opportunity to change the grease! Any NLGI class 2 saponified grease will do. Very careful people can use food grade grease.

Marc Malkwitz - Réponse

I have the KSM150 model and I have different screws to remove. They are square, do you know which tool I need to use?

Thank you!

Pietro Zappia - Réponse

I am having difficulty reinstalling the motor head. I have the motor and worm gear meshed but not the accessory option gear.

C Bosworth - Réponse

Das ist eine super Anleitung, hab meine geliebte Kitchenaid damit in kurzer Zeit wieder gesund gemacht :-) Vielen herzlichen Dank!

Marie - Réponse

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