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How do I replace a Motor Brush in a Stand Mixer?

The governor and control plate work with the phase control board to monitor and control motor speed. You might need to replace the phase control board if the mixer won't run or it doesn't maintain the set speed.

The motor brushes are made of carbon. The carbon brushes should be replaced if they are worn below 5/16-inch.

The planetary housing moves the beater in a circular motion as the planetary gear spins. The beater gear inside the planetary housing is likely to be stripped or damaged if the beater moves in a circular circle around the inside of the bowl. The planetary gear assembly needs to be replaced if the beater doesn't spin.

The speed control plate is used to control the speed of the motor. The lever positions the speed control plate at the correct distance from the governor when you move the switch lever to a speed. The phase control board uses signals from the governor to apply the correct voltage to the drive motor. The governor and phase control board won't be helped by a damaged control plate. If the speed control plate is damaged, you should replace it.

The worm gear drives the vertical shaft and pinion gear. The worm gear should be replaced if the attachment isn't rotating.

Follow these steps to fix your issue:

  1. Shut off the electricity

    The power cord needs to be unplugged.

  2. Remove the carbon motor brushes

    Pull the motor brush cap and carbon brush out with a slot screwdriver. On the other side, repeat the process. The carbon brush caps are spring loaded. If you remove the brush caps, hold onto them so they don't fly off.

  3. Install the carbon motor brushes

    Look from the back of the mixer and position the right side carbon brush with the flattened corner facing the upper left corner of the brush holder. Attach the right side brush to the holder. The brush cap should be reinstalled. The flattened corner of the left side brush is facing the lower right corner of the brush holder. The left side brush should be put in the brush holder. The brush cap should be reinstalled.

  4. Restore power

    The power cord needs to be re connected.

  5. Shut off the electricity

    The power cord needs to be unplugged.

  6. Remove the end cover

    Pull off the end cover with the mounting screw.

  7. Disconnect the wires from the control plate

    Take a picture of the wires that are connected to the control plate.

  8. Remove the control plate

    The spring should be disconnected from the control plate and put on a shop towel to prevent it from coming back into the upper housing. The control plate upper mounting screws have jam nuts on them. Remove the control plate upper mounting screws from the upper housing mounting posts. The control plate needs to be removed.

  9. Remove the phase control board

    Pull off the phase control board with the mounting screw.

  10. Install the new phase control board

    Place the new phase control board in the upper housing.

  11. Reinstall the control plate

    Line the upper mounting screw holes with the control plate in the upper housing. The upper mounting screws need to be reinstalled. The screw should remain visible if the screws are tightened evenly. Take the jam nuts out until you check and adjust the mixer speed. The spring is on the control plate.

  12. Reconnect the control plate wires

    Attach the wires to the control plate using your digital photo as a guide.

  13. Reinstall the end cover

    Line the screw holes and position the end cover on the upper housing. If you pinch wires, you will not be able to reinstalling the end cover.

  14. Restore power

    The power cord needs to be re connected.

  15. Check and adjust the speed control

    To count revolutions, hold a finger next to the beater shaft. The mixer should be started at stir speed. For 15 seconds, count the revolutions of the beater shaft. The beater shaft should hit your finger 15 times if it is spinning at 60rpm. If the mixer is spinning too fast, it's a good idea to turn the control plate. Increase speed by rotating the screws. The speed is adjusted by one full revolution of the screws. After adjusting the speed, reassemble the mixer. When the mixer runs at 60rpm, continue adjusting and checking the speed. Plug the mixer and tighten the jam nuts on the control plate after the correct stir speed is set. Remove the end cover and restore power.

  16. Shut off the electricity

    The power cord needs to be unplugged.

  17. Remove the end cover

    Pull off the end cover with the mounting screw.

  18. Remove the trim band

    Attach the ends of the trim band to the 2 screws by removing the trim band.

  19. Remove the pedestal

    The mixer should be put on a cradle. Don't remove the pedestal hinge pin set screw. The hinge pin needs to be pushed out. The mixer pedestal needs to be lifted.

  20. Remove the planetary gear housing

    Use a slot screwdriver and hammer to remove the planetary ring. To remove the pin that holds the planetary gear housing to the vertical center shaft, use a 5/32-inch drift punch and hammer. To remove the planetary gear housing, use 2 slot screwdrivers.

  21. Remove the bottom cover

    The strain relief can be slid out of the slot in the bottom cover to remove the power cord. The planetary gear has 5 screws. The screws are on the cover. There is a lock washer on one of the screws. The mounting screw needs to be removed along with the lock washer. Lift the bottom cover with the help of the drift punch. Lift the center shaft with the drift punch and remove the bottom cover. The bottom cover should be on the work surface. Grease should be transferred from the worm gear to the upper housing.

  22. Remove the worm gear

    The worm gear brackets have 3Phillips screws and washers on them. The worm gear assembly needs to be pulled up and off.

  23. Install the new worm gear

    Line up the mounting holes by positioning the new worm gear assembly on the bottom cover. The mounting screws and washers need to be reinstalled. Grease the worm gear assembly.

  24. Reinstall the bottom cover

    Lift the bottom cover and align the gears with the help of the drift punch. To get the gears back into place, lower the bottom cover and twist the center shaft. Lower the bottom cover into the upper housing once the gears mesh. The planetary gear has screws around it. Remove the cover mounting screws. The lock washer is on the rear mounting screw.

  25. Reinstall the planetary gear housing

    The center shaft has the planetary gear housing on it. Align the mounting pin holes in the housing with the hole in the center shaft using the drift punch. The mounting pin needs to be reinstalled. Use a rubber mallet to gently tap the ring back onto the housing.

  26. Reinstall the pedestal

    Line up the hinge pin holes on the bottom cover of the pedestal. The hinge pin needs to be put back in place. Use the slot screwdriver to tighten the hinge pin set screw. The power cord strain relief has to be reinstalled. If necessary, use a rubber mallet to tap the hinge pin.

  27. Reinstall the trim band

    Attach the trim band to the upper housing with the screws.

  28. Reinstall the end cover

    Line up the screw holes by placing the end cover on the upper housing. The end cover has a mounting screw. If you pinch wires, you will not be able to reinstalling the end cover.

  29. Restore power

    The power cord needs to be re connected.

Time required:

30 minutes.

You would need the following tools:

phillips screwdriver, putty knife, slot screwdriver, work gloves, wrench set.

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