How To Attach A Garage Door Arm To The Chain
This is where the opener arm attaches the opener to the door.
How to attach a garage door arm to the chain. Using pliers remove the cotter pin from the cotter bolt that attaches the upper end of the door arm to the carriage. Thread the nut s facing the door clockwise until it meets the bracket then release the chain. Attach the bracket that connects the arm the door is opened by one arm that raises it as the carriage travels along the tube. Pull out the cotter bolt with the pliers.
Pull the chain toward the garage door and hold it in position. 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. There is a threaded eye bolt that can be adjusted to get enough slack to attach the chain.
The exact location varies depending on the door. On the chain there is a device called the trolley.