Pull the chain toward the garage door and hold it in position.
How to attach a garage door arm to the chain.
On the chain there is a device called the trolley.
Using pliers remove the cotter pin from the cotter bolt that attaches the upper end of the door arm to the carriage.
Grasp the chain 1 foot from where it connects to the end of the threaded chain anchor.
Press down on the chain with your finger.
Pull out the cotter bolt with the pliers.
This is where the opener arm attaches the opener to the door.
Attach the bracket that connects the arm to the door then attach the arm itself.
Thread the nut s facing the door clockwise until it meets the bracket then release the chain.
The exact location varies depending on the door.
Swivel the arm down and allow it to.