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 opener chain hanging down.
If the door seems okay there may be a problem with the trolley or the opener itself.
The garage door opener loose chain or tight chain can be an easy diy.
Liftmaster and chamberlain are popular garage door openers with chains.
Press the wall control button or remote so that the opener completes its close cycle and the sprocket on.
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Disconnect the power supply and disengage the opener.
If you watch the chain on your opener one side hangs in the up direction and the opposite side hangs going down.
This could be causing your chain to seem to have grown.
Now is a good time to take a look at the sprocket on top of the motor unit.
That is usually an indicator of wear in the worm gear sprocket drive assemblies.
It has a bronze bearing that wears over time and lets the sprocket lean forward.
There s usually a piece of rope hanging from it which is used to disengage and re engage the opener.