How to Change a Garage Door Belt


Garage door operator designs commonly include rubber belts, chains or screw drives to operate a traveler. The traveler moves back and forth on a rail that in turn moves the garage door. Belt drives commonly operate garage doors where the garage is built as part of the house. These drives reduce the noise levels that come from opening and closing the garage door because of the belt's quiet operation. After time, accidents or prolonged use, belt drives wear, become damaged and will need to be replaced.

Things You'll Need

  • Open end wrenches
  • Track grease
  • Replacement belt tensioner
  • Flathead screwdriver
  • Lubricating grease


  • Shut the garage door and disconnect it from the opener by pulling on the release handle on the traveler.

  • Unplug the operator from the electrical outlet.

  • Locate the tensioner mechanism on the belt and fully remove the nuts and spring with a 7/16 inch open-end wrench. The tightening mechanism is located on the traveler and holds the belt tight.

  • Remove the existing belt from around the idler on the garage door side of the operator and from around the sprocket on the opener. Dispose of the belt in the garbage.


  • Place the belt loosely around the idler and connect the ends to the traveler with the new automatic belt tensioner.

  • Slip the belt over the sprocket on the opener verifying the belt's grooves fully mesh with the operator's grooves.

  • Tighten the adjusting bolt nut with a 7/16 inch open-end wrench while holding the locking ring in place with a flathead screwdriver. Tighten the nut until the spring is released. The spring provides the correct tension to the belt.

  • Apply a light coating of grease to the bottom and top of the opener's rail where the traveler makes contact.

  • Reconnect the opener to the door by lifting the garage door by hand until the traveler locks into place.

  • Plug the opener's electrical cord into the electrical outlet.

Tips & Warnings

  • .
  • Garage doors are dangerous. Keep children away when garage doors are being repaired or are in use

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  • Photo Credit Jupiterimages/Comstock/Getty Images
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