The Genie 39277R.S Chain Drive Sprocket is a genuine OEM replacement part engineered for select Genie chain-drive garage door openers. This drive sprocket engages the opener’s chain to transmit motor power to the trolley, helping raise and lower the door smoothly. Replacing a worn or damaged sprocket can resolve symptoms such as chain skipping, grinding noises, uneven travel, or premature chain wear, restoring reliable day-to-day operation in residential applications.
Use the 39277R.S only with models that specifically call out this part number in the owner’s manual or parts diagram; it is not intended for belt-drive units. Installation typically requires disconnecting power, releasing the door with the emergency release, relieving chain tension, removing the opener cover, and swapping the sprocket before re-aligning the chain and setting proper slack per Genie’s instructions. After reassembly, verify and adjust travel limits and force settings if needed. For safety, support the door, ensure the counterbalance system is functional, and consult a qualified technician if you are unsure about the procedure. Keywords: Genie 39277R.S chain drive sprocket, OEM Genie replacement part, chain drive garage door opener sprocket, Genie chain sprocket gear, residential opener repair.
