Question about KitchenAid KSM90 Ultra Power Series Stand Mixer

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Top part of mixer is bouncing when in use. - KitchenAid KSM90 Ultra Power Series Stand Mixer

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Hi and welcome to FixYa, I am Kelly.
The Head Lock is most likely worn. The 4.2 mb Service m\Manual is located here:
http://lib.store.yahoo.net/lib/mendingshed/kitchenaidservicemanual.pdf

You may have a worn hinge pin: Figure 7 page 7 of the pdf file.
The spring for the head lock can be also broken. Item 20 this link: http://www.appliancepartspros.com/partsearch/model.aspx?model_id=5136226&diagram_id=28251571#d28251571

See page 22, figure 72 in section 5 of the service manual for pedestal hinge repairs. Most likely the set screw for the head lock has come loose.

Your parts can be found here: (with some exceptions like item 20 above)

http://www.searspartsdirect.com/partsdirect/part-model/kitchenaid-parts/mixer-parts/Model-KSM90/0593/0212320/P0408117/00004

This information should get you going if your able to read the manual and follow the sometimes vague instructions.

Thanks for choosing FixYa,
Kelly


Posted on Jan 02, 2011

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2 Answers

Its bouncing when mixing


The head unit is not locked in place. If the lever is in the lock position and it still bounces, the cam lever inside has either snapped off or became loose.

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The head bounce sounds as if the locking hook is not engaged properly when you slide the head-lock lever to the locked position.

If this is the case, you will need to disassemble the mixer to make sure the link from the lever to hook is not bent. Another possibility is that the slot in the base the hook engages. If this is broken away, the hook will not be able to hold the head in place (I sure hope that this is not the problem).

The Service Manual can be found at:

http://www.kitchenaidparts.eu/documents/pdf/service-manual/classic-svc-manual-new-email-version.pdf

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1 Answer

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Hi CHARAD, The easiest thing to check are your mixer’s brushes. During the disassembly, did your husband remove either or both of the motor’s brushes (from the side of the mixer’s head)? If yes, then he needs to check their alignment on the armature’s commutator. The concave contact face should be resting completely on the comutator. If you've turned it 90 degrees too much, it wont' seat properly and you'll get no 'juice' to the electric motor so it won't start.
If the answer is no, then that would lead me to suspect the problem most likely will be with your speed control assembly, which may have been damaged during the ‘crazy bouncing’.
Since your husband has already disassembled your mixer once I hope he had your mixer’s Parts List manual on hand, but if he didn’t, you can download a PDF version from the KA website: http://www.kitchenaid.com/flash.cmd?/#/page/home.
Click on Customer Care>Locate Manuals & Guides> Enter the 6 character model number, in your case use K45SSW, and select the file listed under Parts List (1), K45SSWH0.pdf (341.41 KB). Check to ensure it matches your mixer model.
Turn to pages 6 & 7, titled: Motor And Control Parts, which provides an exploded view for the disassembly and reassembly of your mixer’s electrical components, along with all the parts. You’ll want to focus on Illus. No. 25, Control Plate Assembly.
First inspect around the control plate assembly to ensure all the wire connections are OK. It's possible a connection has come loose during the bouncing. Unfortunately the whole controller assembly is fabricated on a little PC board which was not meant to be 'home fixed', and my 'expertise' ends there. A local small appliance repair shop should be able to determine if the controller assembly is functioning properly or not, or you can just order replacement parts without the testing.
As far as parts go, here are four potential vendors in no particular order: RepairClinic.com; mendingshed.com; searspartsdirect.com; partstore.com. Prices for the same part can vary widely between vendors, so do your comparison shopping.
Your husband may already know about the website links below when he worked on the Link & Lever latch, but it’s always good to keep these sites in your ‘toolbox’. Here are some links to several excellent websites that detail the disassembling/reassembly of a KA Mixer.
Between these three websites and their excellent pictures and descriptions and your Parts List manual, you should now be able to completely disassemble and reassemble your mixer.
Good luck and have fun. I hope this helps. Howard, Burke, VA
If this solution has helped you, please rate it, thanks! - hslincoln

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Hi MJANKOW520. I?m going to assume your KA mixer is a ?Tilt-Head? mixer. You don?t say specifically. Based on your description of the symptoms you mixer exhibits, I would say that your head locking mechanism (or a component) of it is either broken, worn or loosened due to normal wear and tear and need to be readjusted (or repaired) for it to keep your mixer head stationery. The inspection and troubleshooting of the inside of your mixer is a DITY capability, particularly if your mixer is out of warranty. Just be sure to have the Parts List manual on hand. If you're lacking one, you can download a PDF version from the KA website: http://www.kitchenaid.com/flash.cmd?/#/page/home. Click on Customer Care>Locate Manuals & Guides> Enter the 6 character model number, in your case, try K45SSW, and select the file listed under Parts List (check to see it this matches your mixer model). This parts list manual provides an exploded view for the disassembly and reassembly of your mixer, along with all the part name and numbers. Turn to page3, titled: Base and Pedestal Unit. You?ll want to focus on Illus. #9, Link & Lever Latch assembly, which locks the mixer head to the pedestal when run your mixer. Check to see if something is just loose, exceedingly worn or broken. If something has broken, you can order replacement parts and install yourself. As far as parts go, here are four potential vendors in no particular order: RepairClinic.com; mendingshed.com; searspartsdirect.com; partstore.com. Prices for the same part can vary widely between vendors, so do your comparison shopping. Once apart you can check for any other unseemly wear and tear on other mixer components. It can be messy but quite gratifying to diagnose and repair your mixer yourself. Finally, here's a link to an excellent site that details the disassembly and replacement of a mixer's grease, which might be helpful, too. http://www.foodonthefood.com/food_on_the_food/2009/04/how-to-repair-a-kitchenaid-mixer-yourself.html If you feel this is beyond your capabilities and would be too difficult to do yourself you can take your mixer to a local small appliance repair shop and have them troubleshoot and fix your mixer. KA Customer Care can provide you with the name and phone # of the closest authorized KA repair shop in your area or you can do a Online web search, but be sure to get at least three estimates before deciding to commit to one repair shop. Good luck. I hope this helps. Howard, Burke, VA If this solution has helped you, please rate it, thanks! - hslincoln

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This sounds like an issue of beater to bowl adjustment, which can come out of alignment naturally over time and with use of the machine.

If the flat beater is striking the bottom of your bowl, this may cause the locking mechanism to loosen and may cause the mixing head to "bounce" during use.

Your Use and Care Guide will cover the "beater to bowl adjustment," which you can do at home in a few minutes with a flathead screwdriver.

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This sounds like an issue of beater to bowl adjustment, which can come out of alignment naturally over time and with use of the machine.

If the flat beater is striking the bottom of your bowl, this may cause the locking mechanism to loosen and may cause the mixing head to "bounce" during use.

Your Use and Care Guide will cover the "beater to bowl adjustment," which you can do at home in a few minutes with a flathead screwdriver.

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This may have a simple solution: This sounds like an issue of beater to bowl adjustment, which can come out of alignment naturally over time and with use of the machine.

If the flat beater is striking the bottom of your bowl, this may cause the locking mechanism to loosen and may cause the mixing head to "bounce" during use.

Your Use and Care Guide will cover the "beater to bowl adjustment," which you can do at home in a few minutes with a flathead screwdriver.

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