The trolley is responsible for pushing or pulling the opener arm along the chain so as to open and close the garage door.
Garage door chain tighten.
Adjust the chain on a garage door opener with help from a garage door spec.
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.
Thankfully garage door manufacturers have included a part in their designs that can help you tighten your chain and stop the chain from slapping against the rail as it opens and closes your garage.
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Remember to not over tighten the chain.
How to tighten your garage door chain.
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.
Once you ve located it you can use a wrench to loosen the adjusting nut closest to the opener head by turning it counterclockwise.
Just tighten enough to stop it hitting the rail.
There s usually a piece of rope hanging from it which is used to disengage and re engage the opener.
Locate the adjustment bolt a bolt with a pair of adjusting nuts on either side of the garage door that is connected to the chain.
The one you re looking for is attached to a bolt found at the spot where the trolley or carriage connects to the rail.