The LiftMaster 041A7278 Sprocket Kit is an OEM replacement drive sprocket designed for select LiftMaster and Chamberlain chain‑drive garage door openers. As the top sprocket that engages the drive chain, this component helps transfer motor power to the trolley, restoring smooth, reliable door movement when the original sprocket becomes worn or damaged. It’s an ideal repair part for homeowners, facility managers, and service professionals looking to maintain or refurbish a chain‑drive opener with genuine LiftMaster components. Also referenced as 41A7278, this sprocket kit supports common search needs such as replacement sprocket, drive sprocket, chain‑drive repair, and LiftMaster opener parts for residential or light commercial applications.
Installation typically involves disconnecting power, relieving chain tension, removing the opener’s top cover, and swapping the sprocket on the output shaft before re‑tensioning the chain and verifying door balance, travel limits, and safety reversal. For compatibility, match the exact part number to your opener’s parts diagram or model‑specific manual; this kit is intended for select chain‑drive units and is not interchangeable with belt‑drive or wall‑mount/jackshaft models unless specified by LiftMaster. Follow all safety precautions and lockout procedures while servicing the opener, and test the door’s force and auto‑reversal after reassembly. For best results, confirm fitment by opener model and serial information on the motor head or through LiftMaster’s official parts lookup.