The LiftMaster 41C589-2 Sprocket & Sprocket Cover is a genuine OEM replacement kit designed for select LiftMaster chain-drive garage door openers. This assembly replaces a worn or damaged top drive sprocket—the component that engages the chain to move the trolley—and includes a protective cover to help keep contaminants away from the drive mechanism and grease. Using the correct drive sprocket restores smooth chain tracking, reduces noise caused by wear, and helps maintain reliable door travel for everyday residential applications. Always verify compatibility by matching 41C589-2 to the parts list in your opener’s manual or by confirming the part number on your existing assembly.
Installation typically involves disconnecting power, releasing the door with the emergency handle, relieving chain tension, removing the old sprocket, and fitting the new sprocket and cover before re-tensioning the chain. After installation, reset and test travel limits and force settings, and verify the safety reversal system and photo-eye operation. This LiftMaster replacement part is intended for chain-drive units (not belt-drive pulleys). For best results, follow the manufacturer’s service procedures and apply only opener-safe lubricants as recommended.
Compatible with LiftMaster model 8550