You will have to apply a spanner to each and turn them in opposite directions.
Garage door chain drive adjustment.
Both adjustment types should be done with the door closed and disconnected from the opener using the emergency release.
Chain adjusts by shortening the chain itself.
Loosen the two lock nuts on the threaded rod.
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.
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Usually a pair of nuts are associated with the locking mechanism while one is concerned with the adjustment of the chain.
Adjustments on the chain are located at or near the master link where the chain engages with the cable graphic below left.
Adjust the chain on a garage door opener with help from a garage door spec.
There may be an adjustment linked to the chain or an adjustment to the length of the door opener track.
Use the wrench to loosen the lock nuts and turn the adjustment nut to set the slack in the chain.
The chain is a very important component that makes up a garage door opener system.