The chain is vibrating on my Linear garage door operator when the door is opening or closing.
This is typically caused by the chain being too tight. Simply loosen the chain adjusting turnbuckle, located on the right hand side of the rail near the operator head when the door is closed. Loosen the turnbuckle approximately ½ turn at a time until the vibration stops. Ensure the locking nuts on the turnbuckle are tight when you are finished.