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Garage door opener chain hanging down.
That is usually an indicator of wear in the worm gear sprocket drive assemblies.
The trolley is responsible for pushing or pulling the opener arm along the chain so as to open and close the garage door.
How to put a chain back on an automatic garage door opener step 1.
Disconnect the power supply and disengage the opener.
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.
The chain may also have come off due to too much play in the sprocket on the overhead opener.
Liftmaster and chamberlain are popular garage door openers with chains.
If you watch the chain on your opener one side hangs in the up direction and the opposite side hangs going down.
It has a bronze bearing that wears over time and lets the sprocket lean forward.
The garage door opener loose chain or tight chain can be an easy diy.
Disengage the garage door from the opener by pulling down on the emergency pull cord to release the door trolley.