Too Much Slack In Garage Door Belt

You may find that a loose garage door opener chain has less power to open and close your garage door or you may find that it is just hitting the door as it moves it and creating an annoying sound.

Too much slack in garage door belt. If you have a 10ft door you should have belt part number 1a5250 2. If you have an 8ft door you should have belt number 41a5250 1. Tim the belt needs to be loosened at the trolley with the door closed. The chain or belt should pick up slack.

The specific procedure should be in the manual for your unit. However you may have to adjust the travel slightly. Tighten until the chain or belt is about 1 4 inch from the bottom of the rail. Reattach the door to the opener and reconnect the opener to the power supply.

There should be no slack in the belt unless it s too large. The information for tightening the belt is provided in the image below. Next jump the belt at the sprocket pulley at the opener 2 notches on the belt. If you find that your garage door opener chain has become loose with time you may want to tighten it up in order to remove some of that slack.

Make sure you have the correct belt and size for your garage door. The belt needs to be connected with the tensioner loosened so that the tensioner can be used to take up any excess slack. This would reduce the slack and less tension on the belt. The belt should still have a little slack when the door is closed.

The manual does not indicate how to solve this problem.