Garage door openers that use an operator rail turn a chain or belt. This piece connects to a trolley, which is also called a carriage. The trolley pulls the opener arm to lift the garage door, and pushes the arm to close the door.
A piece of rope typically hangs down from the trolley. This is used to disengage and reengage the opener. When the opener is disengaged, pressing the wall button or the button on your remote will run the opener and turn the belt or chain. It will not, however, open or closed your door.
You can sort the trolleys by manufacturer, or you can browse other garage door parts using the links below.
IMPORTANT NOTE REGARDING LOCAL PICKUPS: DDM is considered a life-sustaining company because we are an internet retail company that provides essential products. Due to the recent outbreak of Coronavirus, however, we are changing our local order pickup policy at our West Chicago location. To pick up an order you will need to order first. The quickest way is to order in advance through our online shopping cart. There you can select the local pickup option. Or, you can call 630-293-1337 for assistance, to confirm availability of parts, and to place your order. Once ordered, your parts will be available for pickup in the lobby of our north side front entrance. Longer items will be picked up on the south side loading dock. Please honor the six foot social distancing rule. Thank you for your patience and understanding as we all navigate this challenge together. More information is available on our blog titled DDM Adjusts to the COVID-19 Coronavirus. In the same article you will also find documentation and an answer to the question: "Is a garage door repair company a life sustaining business?"