Garage Door Chain Drive Adjustment
On the master link you will see two or three nuts.
Garage door chain drive adjustment. Both adjustment types should be done with the door closed and disconnected from the opener using the emergency release. There may be an adjustment linked to the chain or an adjustment to the length of the door opener track. Loosen the two lock nuts on the threaded rod. You will have to apply a spanner to each and turn them in opposite directions.
Lower the garage door to take the stress off the chain. Adjustments on the chain are located at or near the master link where the chain engages with the cable graphic below left. Use the wrench to loosen the lock nuts and turn the adjustment nut to set the slack in the chain. There are only a few ways that the chain can be tightened.
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