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What is the Garage Door Trolley?

The carriage on a garage door, also known as the trolley, is the part of the door that travels on the rail to reach the motor. An operating arm connects the trolley to the door, pushing or pulling the door as it opens or closes. Usually, it’s installed at the same time as the opener, but will occasionally wear out and need replaced. This is a DIY repair most people can do with the proper tools and equipment. Make sure to disconnect the power cord and always use a sturdy stepladder. Get someone to help you. Safety first.