Gear and sprocket assembly for belt drive units after 2002.
Assembly includes: Spring washer thrust washer retaining ring bearing plate two roll pins drive gear and worm gear helical gear with retainer and grease.
Chain spreader for installation with 1" operator shaft & 1" door shaft.
Includes 2 shaft collars and set screws.
Designed to keep tension on the chain when used with a wall mount commercial operator. It helps avoid premature wear on the door shaft bearing and commercial operator output shaft bearing