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Get to know the opener. The heart of the system is an electric motor that's mounted on the drive track along the centerline of the door. The chain or rubber drive belt, which moves the trolley and door back and forth, fits around the drive sprocket on the motor. The drive belt loops around the plastic idler sprocket on the other end of the main drive track
Bolt a 2x4 cleat to the ceiling frame and secure the motor with angle irons. The diagonal angle iron will prevent lateral motion.
Note: Openers are heavy, so it's extremely important to secure them to ceiling joists or other sturdy framing members.
Mount a cleat over the door and mark a centerline for the header bracket that holds the other end of the drive track.
Install the track in the header bracket. The track (with the drive belt threaded around the idler sprocket) is held in the header bracket with a clevis pin.
Install the arm. A two-part arm (with predrilled holes enabling you to adjust its length) reaches from the drive track trolley to a bracket on the door.
Mount the terminal block on the door frame; its keypad will control the opening and closing, locking and lighting of the garage.
Adjust the door operation. Follow the manufacturer's directions for adjusting the force applied to the door, plus how high it raises and how low it descends.