How To Replace Worn Gears On Garage Door Openers

How To Replace Worn Gears On Garage Door Openers

As a homeowner with a garage door, you might find it beneficial to learn how to replace worn gears on garage door openers. With regular wear and tear, you may have to do some garage door gear repair which can be costly if you have to call a professional.

If you don’t take care of the loose gears at the first signs of the garage door hesitating when you want it to open, you could be stuck with a door that won’t open when you’re running late or caught in a rain storm.

In this guide, we’re going to walk you through garage door gear replacement so you’ll be able to tackle this project yourself and save a bit of money.

Step By Step Garage Door Opener Gears Replacement

Before you begin replacing a gear in a garage door opener, you’ll want to gather your tools and unplug the opener. Typically the tools you will need include:

  • 1/4-inch nut driver
  • 3/8-inch nut driver or socket
  • 5/16-inch nut driver or socket, with extension
  • 1/8-inch Allen wrench
  • Hammer
  • Flat head screwdriver
  • 5/32-inch punch

Loosening The Circuit Board And Chain

On some garage door openers, it may be beneficial for you if you loosen the circuit board so you have more room to work. After you loosen the circuit board, you’ll want to use a wrench to loosen the chain that’s attached to the tension rod.

Losen The Chains

Remove The Helical Gear

Remove the light covers and light bulbs from the motor unit and then unscrew the chain spreader. You’re going to have to flip the motor unit upside down and remove to finish removing the cover of the motor. Then, you will want to remove the helical gear from the unit.

Remove The Helical Gear From Its Shaft

If you are not replacing the entire gear system and just the gear itself, you will want to support both ends of the gear assembly with two pieces of wood (cutting a notch in each piece of wood so that the gear assembly is held securely).

Helical Gear Detachemtn

You will then want to remove the thrust washers and the retaining collar. Pull the motor out of the chassis and then slide the worm gear off the unit. Slide the new worm gear onto the shaft with the notched end facing toward the roll pin.


Now reassemble the entire unit going in reverse order. You will want to make sure that you lubricate the main drive gear, ensuring there is enough lubrication on every tooth for smooth movements. Once the unit is reassembled, plug the garage door opener and test it out.

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