The Genie 37561U.S Belt and Bullet Assembly 12' is a genuine replacement belt kit for select Genie belt-drive garage door openers configured with a 12-foot rail. It transfers power from the opener’s motor to the door carriage, and the integrated “bullet” end attaches to the trolley for smooth, quiet travel. Use this assembly to restore reliable operation when an existing belt is worn, frayed, stretched, or damaged, or when setting up an opener for tall-door applications that require a 12' belt configuration.
This OEM assembly is designed for compatible Genie belt-drive systems that use the bullet-style belt connection and a matching 12' rail/extension; it is not intended for chain-drive or screw-drive models and is not universal. Installation typically involves disconnecting power, releasing the door, routing the belt around the drive sprocket and idler, connecting the bullet to the trolley, tensioning per the opener’s manual, and then reprogramming travel limits and force settings. After installation, verify Safe-T-Beam operation and perform a full open/close test. For proper fit and performance, confirm your opener model and rail length and use this belt only with Genie rails and hardware designed for the bullet connection.