The exact location depends on the type of door.
How to install a garage door opener chain.
Align the opener s rail with the center of the garage door.
Lift the motor compartment into place on the ceiling and attach the rail and carriage to the bracket on the door.
Lift the power unit.
Press the wall control button or remote so that the opener completes its close cycle and the sprocket on.
After that start installing the sensors.
Then install the motor brackets.
How to put a chain back on an automatic garage door opener step 1.
Fix the door bracket in place.
Follow the manufacturer s instructions to assemble the opener and mount the rail to the header bracket above the door.
Attach brackets to the ceiling and door and position the end of the rail above the closed door.
After that attach the motor to the brackets and verify the rail is perfectly horizontal with a bubble level.
The garage door opener mounting bracket also called the header bracket secures the carriage tube to the wall above the door.
Disengage the garage door from the opener by pulling down on the emergency pull cord to release the door trolley.
To install a garage door opener first assemble the rail carriage pulley and motor compartment according to the instructions.