Disengage the garage door from the opener by pulling down on the emergency pull cord to release the door trolley.
Garage door opener chain hanging down.
The trolley is responsible for pushing or pulling the opener arm along the chain so as to open and close the garage door.
This could be causing your chain to seem to have grown.
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The chain may also have come off due to too much play in the sprocket on the overhead opener.
How to put a chain back on an automatic garage door opener step 1.
It has a bronze bearing that wears over time and lets the sprocket lean forward.
Now is a good time to take a look at the sprocket on top of the motor unit.
The garage door opener loose chain or tight chain can be an easy diy.
There s usually a piece of rope hanging from it which is used to disengage and re engage the opener.
If the door seems okay there may be a problem with the trolley or the opener itself.
That is usually an indicator of wear in the worm gear sprocket drive assemblies.
Liftmaster and chamberlain are popular garage door openers with chains.