Can I re-attach the speed/hall sensor magnet to a KitchenAid mixer motor shaft?

Hi. Goto www.mendingshed.com , locate and download the free Kitchenaid Service Manual. This is a comprehensive manual and will help you with your task. You can also go to the Kitchenaid website and download the Parts Catalog for your mixer model.
Good luck!

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I'm not sure what model of Kitchenaid you have.  I have a professional 6 Quart model, KP26M1XPT. I would recommend that you first check the Hall Effect sensor which determines the mixer’s speed.  I had this exact problem and I actually went out and bought another Hall sensor for about $13.  I replaced the original sensor and made sure that the connection between the sensor and control board was nice and snug. My mixer worked as good as new! But I was curious to know if my original sensor was actually defective, so I put it back in mixer and again made sure all of the connections were tight. Guess what? My original sensor also made my mixer work!  There was nothing wrong with the original Hall Effect sensor except the connection between the control board and sensor was not tight--unfortunately I didn't check the connection before I decided to buy the new sensor. My guess is that the connection between the control board and the sensor probably loosens or comes undone over time from use and vibrations. 
1.  Download the mixer parts and diagrams from the Kitchenaid website to see what the Hall Effect sensor looks like. BTW the part number is 9703312.
2.  You'll need a phillips head screwdriver to open up the mixer gear case cover.
3.  Make sure that the connection between the control board and sensor is absolutely tight and snug.  This is critical!
4.  Also, make sure that the orientation of the sensor is correct.  It's difficult to tell which way the sensor should be connected because the control board has three prongs and the sensor can attach facing up or down. After you've made the connection, run the mixer. If it still doesn't work, disconnect the sensor, reconnect it with the prongs facing the opposite direction and try it again.  I actually found the right sensor orientation through a little trial and error.  But by going through this trial and error, I also had my Eureka moment when I realized that the original sensor probably would also work if it were reconnected with correct orientation.  
5.  This whole process probably takes less than 10-15 minutes to perform.
6.  Finally, use your common sense and make sure to unplug the mixer before checking, connecting or disconnecting anything.

The speed of these mixers is controlled by a component inside of the unit known as a Hall Sensor. This part is simple to remove and install. Just contact your nearest kitchenaid parts supplier for this item. It will cost about $13.00.

Be sure to unplug your mixer before removing the cover. You will need a phillips head screwdriver. Once inside you will be able to unplug the hall sensor from the control panel and from the top of the driveshaft. good luck

Two small tabs located on each side of the sensor hold it in the motor housing. Pushing one side with a small flat screwdriver while pulling gently up on the sensor will work.

I would recommend that you first check the Hall effect sensor which determines the speed.  I had this exact problem and I actually went out and bought another Hall sensor for about $13.  I replaced the original sensor and made sure that the connection between the sensor and control board was nice and snug. My blender worked as good as new! But I was curious to know if my original sensor was defective so I put it back in mixer and again made sure all of the connections were tight.  Guess what?  My original sensor also made my mixer work!  There was nothing wrong with my original Hall effect sensor except the connection between the control board and sensor was not adequate--unfortunately I didn't check the connections before I decided to buy another one. My guess is that the connection between the control board and the sensor probably loosens or comes undone over time from use and vibrations. 
1.  Download the mixer parts and diagrams from the Kitchenaid website to see what the Hall effect sensor looks like. 2.  You'll need a phillips head screwdriver to open up the mixer. 3.  Make sure that the connection between the control board and sensor is absolutely tight and snug. 4.  Also, make sure that the orientation of the sensor connection between the control board and sensor is correct. it's hard to know which way the sensor should be connected because the control board has three prongs and the sensor can attach facing up or facing down. If, after you've made the connections, the mixer still doesn't work.  Disconnect the sensor and reconnect it with the prongs facing the opposite direction and try it.  I actually found the right orientation through trial and error.  By going through this trial and error, I also had my Eureka moment when I realized that the original sensor probably would also work if it were reconnected with correct orientation.   5.  This whole process probably takes less than 10-15 minutes to perform.  6.  Make sure you use common sense and unplug the mixer when making connections and such.

I would recommend that you first check the Hall Effect sensor which determines the mixer’s speed.  I had this exact problem and I actually went out and bought another Hall sensor for about $13.  I replaced the original sensor and made sure that the connection between the sensor and control board was nice and snug. My mixer worked as good as new! But I was curious to know if my original sensor was defective, so I put it back in mixer and again made sure all of the connections were snug and tight. Guess what?  My original sensor also made my mixer work!  There was nothing wrong with the original Hall Effect sensor except that the connection between the control board and sensor was not tight--unfortunately I didn't check the connection before I decided to buy another sensor. My guess is that the connection between the control board and the sensor probably loosens or comes undone over time from use and vibrations. To fix your problem:
1.  Download the mixer parts and diagrams from the Kitchenaid website to see what the Hall Effect sensor looks like. BTW the part number is 9703312.
2.  You'll need a phillips head screwdriver to open up the mixer gear case cover.
3.  Make sure that the connection between the control board and sensor is absolutely tight and snug.
4.  Also, make sure that the orientation of the sensor is correct.  It's difficult to tell which way the sensor should be connected because the control board has three prongs and the sensor can attach facing up or down. After you've made the connection, run the mixer. If it still doesn't work, disconnect the sensor, reconnect it with the prongs facing the opposite direction and try it again.  I actually found the right sensor orientation through a little trial and error.  But by going through this trial and error, I also had my Eureka moment when I realized that the original sensor probably would also work if it were reconnected with correct orientation.  
5.  This whole process probably takes about 10-15 minutes to perform.
6.  Finally, use your common sense and make sure to unplug the mixer before checking, connecting or disconnecting anything.

OK, you mentioned everything except the brand. I found on some models of Sunbeam mixers that the speed governor would fail due to the control knob screw being loose.

On that particular model, the screw is behind a stick-on label in the center of the knob. Peel off the label and make sure the screw is tight.

If your mixer isn't a Sunbeam, please advise.

First thing, check the Hall Effect Sensor (part # 9703312) to make sure that it is seated snugly AND properly!  The Hall Effect sensor measures the speed of a tiny rotating magnet and basically tells your mixer how fast it should rotate.  I was experiencing the same problem that many others have described here--my mixer would go really fast no matter what speed I put it on and it would shut off after five seconds. I came to the FixYa site and saw that one solution that seemed to work was to replace the Hall Effect sensor.  So I went to a local hardware store and purchased a new Hall Effect Sensor for about $13.  After I replaced the "defective" sensor, my mixer still did not work.  So, I started experimenting with the three prong orientation of the control board--this can make a big difference. After a little trial and error, I found the correct orientation for the sensor and my mixer worked good as new!  But I was curious to see if the improper orientation was the cause of my original "defective" sensor.  So I put the "defective" sensor back with the proper orientation and THIS ALSO FIXED MY SPEED PROBLEM! There was nothing wrong with my original Hall Effect Sensor at all--it simply was not snugly or properly seated!  I'm not sure how it happened--possibly over time the sensor prongs may have become unseated from the vibrations of running the mixer on high speeds--but my original Hall sensor was not seated properly or snugly.  So before you run out and buy a new Hall Effect sensor make sure that the original one is not only snugly seated but also properly oriented!  If I knew how to add digital pics, I would have put pictures in my comments to clearly demonstrate what I found.  Unfortunately, I am not sure how to do this.   To sum this up: 1. Download the parts information and diagrams from the Kitchenaid site and find the Hall sensor (part # 9703312).  2. Make sure that the Hall sensor is firmly attached on both ends.  The actual sensor should be located next to a tiny magnet and this end needs to be securely seated.  And the other end of the Hall effect sensor has three small prong holes which also need to be firmly and corrected seated to the control board! Bottom line, my mixer is working like new and I put the original Hall Effect sensor back in the mixer. I'm going to hold on the new one as a backup...you never know.

I had a similar problem where the mixer would also go to fast speed right away. On the back at the top was a screw that was loose. After tightening this screw I had 4 speeds but no stir speed. I unscrewed that screw and a bolt fell out. This bolt went to threads on the inside of the area covered by that back plate. I put that bolt back on and tightened it and the corresponding one on the other side and wala the mixer works perfectly at all speeds. Hope it helps. Make sure mixer is unplugged before attempting anything like this (wires are exposed when the back plate is removed - some kind of flexible circuit board).

You might have someone repair it for you; here is a place that charges a flat fee of $69.95 and thats including the return shipping. Check 'em out:http://www.marbeck.com/repair_mixer_kitchenaid.html The speed controller board sounds like the right direction but it hard to know if that is the issue until you install a new part. This is a known issue as far as I have heard around the internet. You might give KA a call and see if they can help; all they can say is no. I have heard they revised the part to fix the problem; my brother had a couple of boards replaced on his pro model and now it seems fine. Good luck!