A KitchenAid stand mixer is a mechanical marvel. It's an old-fashioned machine, even if it's one of the newer models that improvements have made less stalwart than the older models. Taking it apart is a simple matter that can familiarize you with the workings of KitchenAid mixers, and allow for self-repairs that will keep it running for decades. There are three main parts that are accessible: the attachment hub, the planetary, and the motor housing. An invaluable aid is the free download of an old KitchenAid service manual at MendingShed.com.
Detach the KitchenAid mixer plug from the wall. Wrap the plug in a small plastic bag. Secure the bag with a rubber band.
Remove the single Phillips screw at the top of the rear cap to remove the cap, then remove the two Phillips screws to release the aluminum band that runs around the mixer.
Tap gently with the blade screwdriver around the perimeter of the metal ring until the ring is loosened. This is the aluminum ring that KitchenAid calls the drip cup. It is somewhat soft.
Disassembling the Planetary
Put a towel or cloth under the mixer to protect the finish. Turn the mixer upside down or lay it on its side. Punch out the pin that secures the planetary gear assembly to the center shaft. Use a 5/32-inch punch or small screwdriver. Once removed, the planetary assembly cover can be pried and wiggled off the center shaft.
Remove the five flat head screws that encircle the perimeter of the gear in the mixer body. Nudge the circular gear ring from the mixer to remove it.
Remove any old grease in this area of the mixer. Use a grease cutter if necessary. Old grease can be tough and sticky.
Unscrew the four Phillips screws that hold the top halves of the mixer together. On bowl-lift mixer models, the mixer stand must first be detached to access all four of these screws. Ease apart the two halves of the mixer top, being careful not to tear the rubber gasket that is between them.
Scoop and scrape out the old grease from the gear assembly. Use a small utility knife to aid removal if the grease is thick or solid. It can be messy.
Remove the three screws that secure the gear tower. Remove the gear tower.
Clean the gear tower, then reassemble and reinstall it.
Disassembling the Attachment Hub
Remove the attachment hub bevel gear from the gear case and motor housing. This can be done by pulling it out of the attachment hub. Check for wear or broken teeth.
Clean out the attachment hub. Remove any and all old grease. Pack this area with six ounces of new grease before reassembling the mixer.
Remove the center gear, bevel gear, and vertical center shaft. Push up on the shaft from below to expose the pin. The pin is removed to examine or replace these gears.
Disassembling the Motor
Start by disassembling the control unit. First remove the flag terminals from the stator. Use needle nose pliers.
Remove the end seal, and disconnect the terminals from the phase control.
Unhook the control board spring at the bottom of the control board.
Unlock the two lock nuts on the control board, and unscrew the two adjusting screws. The control board can now be removed.
Remove the motor. All other work is electrical rather than mechanical, and should utilize the KitchenAid service manual.
Reverse the above three steps to reassemble the KitchenAid stand mixer.