My Kitchen Aid Pro5 squeals when it's running. I may have overheated it when mixing bread dough. It seems to be running okay. It just makes a very high-pitched noise now. What can I do to fix this?

Manuals Literature

Kitchen Aid manuals link above

Sears link to manual below (may want to simply search with Google.com using the model name and number for parts if you plan to repair it yourself.)

KP26M1XSL5 KITCHENAID 6 QT STAND MIXER PROFESSIONAL 600 BOWL LIFT Manual...

Sounds like the worm gear was stripped. This gear is designed to fail when the load on the motor is too great. This protects the motor from overheating and burning out. By the way, the mixer should not be used above the number 2 speed when using the dough hook.

The worm gear is not all that hard to replace although you will have to contend with a lot of grease. See the Service Manual:
http://www.kitchenaidparts.eu/documents/pdf/service-manual/classic-svc-manual-new-email-version.pdf

There is a good chance you burned up the electrical Connectors to the motor or you have have blown the FUSE that is located inside the housing. The Motor has a Self Shut Off when it overheats but if you have over taxed the motor more than once, then there is a good change you need to repair/replace it with something that can handle harder work. My sister got a Mix Master the same time I got my Kitchen Aid, My Kitchen Aid is running strong since 2003 and her Mix Master died in 2005 and I bought her a Kitchen Aid. Sorry but I am not fond of the Sunbeam Mixer's.... Quality has gone down hill over the years to keep their prices low.

bread is very tuff on mixers. always buy the strongest mixer that you can afford. im guessing the field in the motor fried.

You have not supplied a model number and the bowl lift models are not all the same. A couple of items you could check, make sure that the bowl retaining clip that engages with the dimple on the pedestal side of the bowl is not broken. Make sure any bolts/screws holding the pedestal to the base or the pedestal to the motor are tight. Even if you supply a model number I can't think of anything else to look at unless the handle is not lifting the bowl up tight enough. I think on some models the arm holds the carrier up with some pressure which would help stop the wobbles.

The blade sounds like it's jammed somehow perhaps simply with some food matter.
Ensure the mixer is not plugged in then try removing the bowl, locking the mixer in the down position and pushing up hard on the blade to try and dislodge it. If it comes free and lifts up then try wiggling and rotating it normally off the mount.
Sometimes with use the attachments can become slightly warped requiring more force to lift them before rotating off the mount.
I once used my own Kitchen Aid mixer with the dough hook attachment to make a whole wheat bread dough. When I was done the hook was a bit bent from the hearty dough. There was also some flour in the mount causing it to jam. Removing the hook attachment proved difficult but not imposable.
Good luck.

Your mixer is easily able to handle the kneading of bread dough. Please advise:

9 cups of all purpose white flour, maximum.

6 cups of specialty flour, maximum. This is any flour besides all purpose white.

Bread doughs are only to be needed on speed 2, and never for longer than 7 minutes.

This is all stated in the Use and Care guide for the mixer itself. If these guidelines are not followed, it may lead to a product failure.

The mixer motor has probably overheated, as proper use and care was not being followed with the stand mixer.

Bread doughs are recommended to be mixed on speed 2 only and never for longer than 7 minutes. With the resistance of a bread dough that is provided against the beater, mixing for over 7 minutes may overheat mixer and cause smoking.

Please consult your use and care guide to refresh your memory about how to properly use your mixer for making bread doughs.

IT NEEDS TO PROOF LONGER

This mixer has a control board on the back that has 2 contacts points, if it is out of adjustment, the machine will not run. You need to adjust the 2 screws at the top (where the springs are) to make the contacts connect. That should solve your problem.