How To Attach A Garage Door Arm To The Chain

On the chain there is a device called the trolley.

How to attach a garage door arm to the chain.

Thread the nut s facing the door clockwise until it meets the bracket then release the chain. Swivel the arm down and allow it to. Attach the bracket that connects the arm the door is opened by one arm that raises it as the carriage travels along the tube. The exact location varies depending on the door.

Grasp the chain 1 foot from where it connects to the end of the threaded chain anchor. Using pliers remove the cotter pin from the cotter bolt that attaches the upper end of the door arm to the carriage. Press down on the chain with your finger. Attach the bracket that connects the arm to the door then attach the arm itself.

You should have 1 2 inch of play in the chain. This is where the opener arm attaches the opener to the door.