The LiftMaster 41D3485 Chain Assembly is an OEM replacement drive assembly engineered for chain-drive LiftMaster garage door openers configured for a 10-foot door. It replaces a worn or stretched chain-and-cable run to restore reliable lifting performance and smooth travel on T-rail systems. Ideal for service and repair of residential openers built by the Chamberlain Group, this assembly helps correct slipping, noisy operation, or travel issues associated with aging drive components while maintaining factory fit and function.
Use this chain assembly only on compatible LiftMaster/Chamberlain/Craftsman chain-drive units that are specifically set up with a 10-foot T-rail; it is not for belt-drive models. Installation typically involves relieving tension, swapping the chain-and-cable assembly on the rail, then setting proper chain tension and re-adjusting travel limits according to the opener’s manual. After installation, test the safety reversal system and photo eyes to ensure proper operation. For best results, confirm your opener model and rail configuration before ordering, as 7-foot and 8-foot systems use different assemblies and hardware.
Compatible with all LiftMaster chain drive 10' models