Loosen the two lock nuts on the threaded rod.
Garage door chain drive adjustment.
Both adjustment types should be done with the door closed and disconnected from the opener using the emergency release.
Use the wrench to loosen the lock nuts and turn the adjustment nut to set the slack in the chain.
If you stand at the door facing the motor you will probably see the threaded rod that adjusts the chain length on the right side of the door.
On the master link you will see two or three nuts.
There are only a few ways that the chain can be tightened.
Adjust the chain on a garage door opener with help from a garage door spec.
The chain is a very important component that makes up a garage door opener system.
Chain adjusts by shortening the chain itself.
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Lower the garage door to take the stress off the chain.
You will have to apply a spanner to each and turn them in opposite directions.