The LiftMaster 15-40B14GXX sprocket is a genuine replacement component for chain-driven LiftMaster operators, designed to transmit power reliably in drive assemblies for sectional doors, rolling doors, and select gate operators. Identified as a 40B14T sprocket with a 3/8 inch bore, it is intended for systems built around ANSI #40 roller chain where a 14-tooth sprocket is specified. Use it to restore smooth, consistent chain engagement and proper drive ratio in compatible LiftMaster commercial or light-industrial applications that require an OEM sprocket for maintenance or repair.
This sprocket follows the common 40B14T convention (ANSI #40 chain, 14 teeth) with a 3/8 inch bore to mount on the corresponding shaft of the operator’s drive train. For best results, confirm the chain series, tooth count, and bore match your operator’s parts schematic before ordering. During installation, disconnect power, relieve chain tension, align the sprocket with the mating sprocket, and re-tension the chain per the manufacturer’s service manual. Proper alignment and lubrication of the #40 chain help ensure quiet operation and long service life. Part number: LiftMaster 15-40B14GXX.