Pull the release rope and push the door all the way up until you hear a click.
Overhead garage door engage and disengage.
Re engaging the garage door to the electric garage door unit.
Push the control button either on a remote or at the wall station to operate the garage door opener.
Detaching a garage door from a screw drive opener system for screw drive models the shuttle release lever will be engaged and in the up position see image 1 below.
Make sure the carriage unit is nearest to the garage door.
Some garage doors do not have a manual lock once disengaged from the garage door opener.
The opener trolley will engage the carriage once it comes to the full open position.