Question about KitchenAid KSM90 Ultra Power Series Stand Mixer
Recently, my KSM90 has been flinging all the ingredients out on the "stir" setting because it runs too fast. I've had this mixer for years and never had it give me any problems, but now "Stir" setting is like "turbo." It will do this speed mixing whether the bowl is empty or not. What can I do to return it to idle speed? It doesn't sound different (just higher sounding speed), it doesn't smoke, smell, or otherwise run any different than it ever has.
There are several things that regulate the speed, we will assume that the adjustment has not been messed about with. If the governor on the motor armature that presses against the underside of the square black speed control plate at the back has not flown apart then I would replace the small pcb (phase board) on the top under the back cover. One screw and 4 wires hold it on.
Posted on Jun 23, 2017
ok to answer both of your questions. the mixer needs a new speed selector switch. it sounds to me like the contacts are burnt out or worn out one. the motor is fine its just the motor isnt getting the right voltage from the switch. its either on or off or medium speed or no speed. either way you both have to replace the switches. you can get the parts and do it yourself at kitchenaid.com or your local appliance store should be able to get them for you to.
Posted on May 05, 2008
SOURCE: mixer speed turned erratic!
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. BTW the part number is 9703312. 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 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.
Posted on Dec 30, 2008
Here is a link to the instruction manual:
Tilt back the head of your mixer. Look at the joint between the head/body of the mixer. A flat-head (standard) screw will now be visible. Turn this screw counter-clockwise to raise the attachments, clockwise to lower them. Don't turn the screw too much, it is pretty sensitive.
Posted on Jan 24, 2009
SOURCE: Mixer does not function at
Remove the brushes. Two black screws, one on each side. Pay close attention to orientation. MUST INSERT THE SAME EXACT WAY! Use electrical contact cleaner. I said electrical contact cleaner, put the WD40 back in the drawer!!! Using electrical contact cleaner, clean the contacts. Now clean them again, now repeat two or three more times. Spray SOME, meaning a little, into each hole. Reassemble and try it out. If this does not fix the problem refer to the section on removing the cover to access the motor and gears. disassemble clean the motor's brush surface and the contacts. if you don't know what I'm talking about then stop and call a pro.
This is a very common reaccuring problem with these things. Especially when meat grinding or cookie doughing with it. If you move to replace, get a stronger model, like the 500 or the 600. No, I do not sit around repairing mixers all day. I just happen to know a lot about the ones my wife has destroyed. Some two or even three times. after a while it pays to go get the right equipement.
Posted on Mar 16, 2009
Hi. Goto kitchenaid.com and download the parts catalog for your mixer model, these drawings will assist you in the disassembly and reassembly of your mixer.
You'll need to replace the speed control in your mixer. This is a common problem. Be prepared to wait at least a month for your parts to arrive. Unplug your mixer before you open it up.
If you're still under warranty call kitchenaid!
If this solution has assisted you, please rate it. Good luck! ricardok45
Posted on Mar 21, 2009
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