Question about KitchenAid KSM50PR Professional Series Stand Mixer

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Mixer starts running on selected speed then speeds up & quits

Then motor has plenty of power, and the transmission is working properly, but as soon as we start needing bread the motor speeds up to full speed then quits.  The control can then be cycled to stop and the machine started over where it will repeat the same thing.  the machine was purchased new just over a year ago.  Our family has four other of your machines, one is way over ten years old and none have had this experience.  We love our Kitchenaids and regret this trouble.

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Before you replace the speed sensor, check that the magnet on the motor shaft is lined up directly under the sensor. I had the Off-HighSpeed-AutoOff issue but once I moved this back in place, it worked again.

Posted on Feb 07, 2015

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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.

Posted on Mar 21, 2009

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1 Answer

It just quit while I was using on high speed.


The lady's model is a K45SS and it does not have a Hall Effect Senor, Her machine di not go to high speed, it STOPPED!!, and that is all we know. If the mixer motor still runs or operates then it is a gear problem and yes it would be the nylon worm gear made to fail in order to protect the motor from burning out. if it won't start at all no noise or movement then it is an electrical problem and it could be the speed control switch the brushes the phase control board the govorner or the motor. what is needed is more information from the lady seeking help.

Dec 12, 2012 | KitchenAid K45SS Classic Stand Mixer

1 Answer

Kitchenaid mixer motor quit , I dont really see any thing wrong with the brushes.


Obtain a copy of the Repair Part List for your model from Kitchenaid.com.
Download a Copy of the Kitchenaid Service manual.

http://www.kitchenaidparts.be/centers/servicemanual/mixer.pdf

First, you may want to adjust the mixer's speeds:

1. Loosen the lock nuts enough & Turn the 2 top screws clockwise until they cannot be turned
anymore. Leave the bottom screw alone for now.
2. Use a dab of white paint or paper whiteout to mark the positions of the Phillips screws.
3. Plug in your mixer and Set the speed selector to "Stir".
4. Turn each top screw One full turn couterclockwise (alternating between Left and Right)
Keep making one full turn at the time (for both left and right) until the motor starts running.
5. Put your hand near the Agitator shaft and allow it to brush your finger slightly. Use your
watch or clock and start counting the number of times the shaft touches your finger in
60 seconds. The correct count should be 60 RPM (Rounds Per Minute). If it is less
or more than 60, give each screw 1/4 turn counterclockwise or clockwise and start counting
again. Now tighten both lock nuts.
6. Set the speed selector to "6" and turn the bottom screw either clockwise or counterclockwise
to achieve a speed of 180 RPM.

For your reference, the planetary RPM's for the 5-qt. tilt-head Artisan Stand Mixer are as follows:
Stir speed - 60
Speed 2 - 95
Speed 4 - 135
Speed 6 - 180
Speed 8 - 225
Speed 10 - 280

Second, if the mixer won't run:
Remove the Control Plate Assembly (36), the Phase Control Board (39)
and the motor Governor Assembly (35). Inspect for loose connections,
burnt or damaged components. If they seem to look OK, re-assemble
them and test the mixer. If the motor still won't run, then I might suspect
a defective Phase Control Board (39).

Aug 01, 2011 | KitchenAid K45SS Classic Stand Mixer

1 Answer

Kitchenaid Professional HP mixer, motor stopped while making dough. I let everything cool down and with no attachments it will not turn on. As soon as you turn it on the motor gets hot but no noise or...


Open the Transmission Housing and remove the two screws holding
the Motor. Lift it off the gears and test run it by itself. The motor
should run normally at different speeds. If it does, then you can move on
to the gears. Manually turn the Worm Gear and make sure nothing got jammed.
The Bevel Gear should turn smoothly.

Jul 18, 2011 | KitchenAid KP2671 Professional 6 Series...

1 Answer

Runs wide open then quits


Looking at the parts list:

http://shared.whirlpoolcorp.com/assets/pdfs/literature/Repair%20Part%20List%20-%208204551.pdf

find item 9. It is a hall effect sensor which measures the speed of the motor and feeds back that info to the controller - if it is open or shorted the motor will not be controlled and will either not run at all or run wide open.

Mar 24, 2010 | KitchenAid KV25G0X Stand Mixer

1 Answer

The mixer motor starts and stops, it will not continue running on any speed. By playing with the speed selector you can get it running sometimes but you cannot keep it running if you change speeds.


Here is how your speed control works:

Speed Control
The speed control of the mixer is attained through the use of a governor assembly mounted at the rear of the control plate assembly.
The electrical circuit is made and broken by the action of the fly ball governor revolving against the control plate.
When the switch lever is moved to an ON position, the position of the control plate with respect to the governor is changed by the action of the switch lever.
Thus, when the control plate is set close to the governor, a relatively low speed of the motor causes the governor to make or break the mixer’s electrical circuit through the control plate.
When the control plate is set farther away, a greater motor speed is required before the governor starts breaking the circuit.
The action of the governor is such that the speed of the motor will remain constant for a given setting of the control plate within certain loads.
After certain loads have been exceeded, the speed of the motor will drop to meet the torque requirements of the given load.
Speed is controlled by the governor and the control plate in conjunction with the phase control.

TRIAC RMS VOLTAGE
BOTH CONTACTS OPEN - 40 VOLTS
ONE CONTACT OPEN - 80 VOLTS
BOTH CONTACTS CLOSED - FULL VOLTAGE
NOTE: The triac regulates the power the motor sees depending on control board contacts.
A device called a triac is a part of the phase control circuit.
This device determines the amount of power the motor sees dependent upon the condition of the control board contacts.
If both contacts are open, about 40 volts RMS is applied to the motor and about 80 volts is applied when either contact is closed and the other is open.
When both contacts are closed, the triac is full on; consequently, full power is applied to the motor. In this way, the speed is controlled.
If the mixer motor begins to run too fast for a
particular speed setting, one or both contacts open, which cuts back on the voltage the motor sees, thus slowing it up.
If the motor operation becomes too slow, one or both contacts will close, applying the needed voltage to the motor to sufficiently increase motor speed.
This is always accomplished through the triac.
The control plate contacts control the triac, and in turn, controls the amount of power supplied to the motor.

The control Plate for your mixer is PN
W10119326
http://www.marbeck.com/mixers_kitchenaid_parts.html

If your not good with tools / meters or tedious repairs do NOT attempt this yourself.
The service manual for your mixer can be found here
http://www.f-ems.com/download/DownLoad.aspx?DocsID=082009012917

and is:
LIT4177310-C


Mar 14, 2010 | KitchenAid KSM103 Professional 5 Series...

1 Answer

Kitchenaid 625 watt 6 quart mixer. Was using it


HAMILTONCOOL - It appears that your mixer had a mechanical failure in the transmission box or planetary gear assembly of your mixer failure - one of the main gears has failed, hence the loss of power to the agitator. You didn't mention any associated noise prior to the loss of power to your agitator, but I'm assuming there was just a little more noise than usual, prior to failure.
The inspection and troubleshooting of the transmission is a DITY capability, particularly if your mixer is out of warranty. Just be sure to have the correct Part List manual around when you start to disassemble your mixer. If you're lacking one, you can download it from the KA website. Click on Customer Care>Locate Manuals & Guides> Enter the 6 character model number, and then select Parts List file. You can check the page titled 'Case, Gearing & Planetary Unit, for the disassembly, troubleshooting, and reassembly of your mixer, along with all the parts. It can be messy but gratifying. Once apart you can check for any other unseemly wear and tear on the gears, etc. Good hunting... I hope this helps - Howard, Burke, VA

Nov 19, 2009 | KitchenAid Food Mixers

1 Answer

Stoped working


kazikeva... It's not very clear what stopped working; the motor, the mixer, what, in particular? You don't tell me how old your mixer is and how much it's been used, all relevant towards pointing me to the problem(s). The more detail you can provide, the better my answer will be towards helping solve your problem. Are you getting any sound when you hit the start knob, or is it just dead silence? If you have dead silence, then it is definitely a power issue, which means it a couple of things could be conspiring to make your mixer not run. It may be a bad controller assembly (the speed knob), or it could be the motor, but either way it's something you can check yourself. I'd start with the controller assembly and inspect that first. It's possible a connection has come loose. Unfortunately whole controller assembly is on a little PC board filled with resistors, capacitors and diodes, which was not meant to be 'home fixed'. My 'expertise' ends at being able to recognize a resistor from a capacitor, but I don't get much deeper than that. A local small appliance repair shop should be able to determine if the controller assembly is functioning properly or not. The next possibility would be with the motor itself, but electric motors are pretty simple mechanisms and generally don't fail. If you?re getting 'noise' from the motor but the mixer won't turn, then you've had a mechanical failure in the transmission box or planetary gear assembly of your mixer. The inspection and troubleshooting of the transmission is a DITY capability, particularly if your mixer is out of warranty. Just be sure to have the correct Part List manual around when you start to disassemble your mixer. You want Part No. 8212257 for your mixer, which you can download from KA customer service. I hope this helps! Howard, Burke, VA

Nov 04, 2009 | KitchenAid KSM90 Ultra Power Series Stand...

1 Answer

Kitchenaid mixer not running


Robbie. Are you getting any sound when you hit to start knob, or is it just dead silence? If you have dead silence, then it is definitely a power issue, which means it a couple of things could be conspiring to make your mixer not run. It may be a bad controller assembly (the speed knob), or it could be the motor, but either way it's something you can check yourself.
I'd start with the controller assembly and inspect that first. It's possible a connection has come loose. Unfortunately whole controller assembly is on a little PC board filled with resistors, capacitors and diodes, which was not meant to be 'home fixed'. My 'expertise' ends at being able to recognize a resistor from a capacitor, but I don't get much deeper than that. A local small appliance repair shop should be able to determine if the controller assembly is functioning properly or not.
The next possibility would be with the motor itself, but electric motors are pretty simple mechanisms and generally don't fail.
If your getting 'noise' from the motor but the mixer won't turn, then you've had a mechanical failure in the transmission box or planetary gear assembly of your mixer. The inspection and troubleshooting of the transmission is a DITY capability, particularly if your mixer is out of warranty. Just be sure to have the correct Part List manual around when you start to disassemble your mixer. You want Part No. 8212278 Rev D for your mixer, which you can download from KA customer service.
I hope this helps! Howard, Burke, VA

Apr 11, 2009 | KitchenAid KP26M1X Stand Mixer

1 Answer

Speed of mixer


does the motor still run or does it slowly start to get less loud? or is the beater assembly that dosnt work? two different issues. if the motor runs but dosnt beat then its the planitary gears that are ground out and need replacing. if the motor slowly dies out then you need to replace the motor.

Dec 24, 2007 | KitchenAid KSM90 Ultra Power Series Stand...

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