How to Replace a Stand Mixer Worm Gear

 

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This step-by-step repair guide explains how to replace the worm gear in a stand mixer. Located inside the lower cover, the worm gear turns on the inner edge of the stationary planetary gear to spin the attachment. If the attachment won't turn, the worm gear teeth might be stripped (the teeth are designed to strip if the drive system binds up, to protect other gears and the motor from damage). Replace the worm gear with the manufacturer-approved replacement part if the worm gear teeth are worn or damaged.

Repair difficulty:
     
Time required:

Less than 30 min.

Parts Required

  • Worm gear

For manuals, repair guides, and specific part recommendations, enter your model number.

Tools Required

  • Work gloves
  • Drift punch
  • Hammer
  • Phillips screwdriver
  • Slot screwdriver
  • #1 square head driver
  • Putty knife
  • Shop towels
  • Rubber mallet

Before you begin

Wear work gloves to protect your hands.

Instructions

 Warning: Undertaking repairs or maintenance to appliances or power equipment can be hazardous. Should you choose to undertake repairs or maintenance, you are assuming the risk of injury to your person or property. In an effort to reduce the risk, use the proper tools and safety equipment noted in the applicable guide and follow all instructions. Do not proceed until you are confident that you understand all of the steps and are capable of completing the repair. Some repairs or maintenance, however, should only be performed by a qualified technician.

Replace the Worm Gear in a Stand Mixer

Step 1: Shut off the electricity

Unplug the power cord.

Step 2: Remove the end cover

Remove the end cover mounting screw and pull off the end cover.

Step 3: Remove the trim band

Remove the 2 screws securing the ends of the trim band and remove the trim band.

Step 4: Remove the pedestal

Flip the mixer over onto a padded cradle.

 

Loosen but don't remove the pedestal hinge pin setscrew.

 

Push the hinge pin out.

 

Lift the pedestal off the mixer.

 Tip: Use a drift punch and hammer to drive out the hinge pin it it's difficult to remove by hand.

Step 5: Remove the planetary gear housing

Remove the planetary drip ring by gently tapping it using a slot screwdriver and hammer.

 

Using a 5/32-inch drift punch and hammer, drive the pin out that holds the planetary gear housing to the vertical center shaft.

 

Use 2 slot screwdrivers to pry off the planetary gear housing.

Step 6: Remove the bottom cover

Remove the power cord from the bottom cover by sliding the molded strain relief out of the slot in the bottom cover.

 

Remove the 5 screws from around the planetary gear.

 

Remove the 4 mounting screws from the cover. One of the rear mounting screws has a lock washer. Remove the lock washer along with the mounting screw.

 

Slide the 5/32-inch drift punch through the center shaft hole to help lift the bottom cover.

 

Gently pry the bottom cover up while lifting the center shaft with the drift punch and remove the bottom cover.

 

Set the bottom cover on a work surface.

 

Transfer grease from the worm gear to the upper housing.

Step 7: Remove the worm gear

Remove the 3 Phillips screws and washers from the worm gear bracket.

 

Pull the worm gear assembly up and off.

Step 8: Install the new worm gear

Position the new worm gear assembly on the bottom cover and line up the mounting holes.

 

Reinstall the mounting screws and washers.

 

Lubricate the worm gear assembly with grease.

Step 9: Reinstall the bottom cover

Insert the drift punch into the center shaft hole to help you lift the bottom cover and align the gears.

 

Lower the bottom cover down into the upper housing, working the gears back into place by slightly twisting the center shaft.

 

Once the gears mesh, lower the bottom cover fully down into the upper housing.

 

Reinstall the screws around the planetary gear.

 

Reinstall the cover mounting screws. On the rear mounting screw that includes the lock washer, reinstall the lock washer along with the mounting screw.

 Tip: Use the lock washer on one of the two back cover screws.

Step 10: Reinstall the planetary gear housing

Slide the planetary gear housing down onto the center shaft.

 

Using the drift punch, align the mounting pin holes in the housing with the hole in the center shaft.

 

Reinstall the mounting pin.

 

Reinstall the drip ring by gently tapping it back onto the housing using a rubber mallet.

Step 11: Reinstall the pedestal

Position the pedestal on the bottom cover and line up the hinge pin holes.

 

Reinstall the hinge pin.

 

Tighten the hinge pin set screw using a slot screwdriver.

 

Reinstall the power cord strain relief.

 Tip: Use a rubber mallet to tap the hinge pin into the pedestal if needed.

Step 12: Reinstall the trim band

Reinstall the trim band on the upper housing and secure it with the mounting screws.

Step 13: Reinstall the end cover

Position the end cover on the upper housing and line up the screw holes.

 

Reinstall the end cover mounting screw.

 Warning: Do not pinch any wires when reinstalling the end cover.

Step 14: Restore power

Reconnect the power cord.