The LiftMaster gear and sprocket assembly part 41C4770 is the most common part to wear out in a garage door opener. This is the genuine replacement made by LiftMaster and includes everything needed for quick installation. The 41C4770 gear and sprocket assembly includes the drive gear(41A2817), worm gear, helical gear(41A2818), retainers, washers, pins, bearing plate, grease and instructions.
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Compatible with LiftMaster ATS211 and ATS211R models