The Genie 075004.0003.S is an OEM sprocket assembly designed for use on Genie MH (Medium H-rail) and MJ (Medium Jackshaft) commercial door operators, fitted for ANSI #41 roller chain (0.500 in pitch). This variant features a 48T, 1-inch bore configuration. Selecting the correct tooth count and bore diameter is critical: an incorrect tooth count will produce the wrong gear ratio, and an incorrect bore diameter will not fit the operator shaft. The MH/MJ series uses #41 chain and is not interchangeable with the J/H/GH series which uses #50 chain. Sold as one sprocket assembly (each).
A: This sprocket is designed specifically for #41 ANSI roller chain, which has a 0.500 inch pitch. Using any other chain pitch will result in improper engagement and accelerated wear.
A: The suffix in the part number designates the specific variant. Part number 075004.0003.S denotes the 48-tooth version with a 1-inch bore. Other variants in the 075004 series include different tooth counts and bore sizes, so always confirm the full part number before ordering.
A: This sprocket assembly is designed for Genie MH and MJ series commercial door operators. Verify your operator model against Genie documentation or contact a Genie parts distributor to confirm fitment before installation.
A: The sprocket is steel construction, which provides the durability and load capacity required for commercial door operator duty cycles.
A: A larger tooth count such as 48T produces a lower drive ratio relative to a smaller drive sprocket, resulting in reduced chain speed at the driven shaft and increased torque output. Selecting the correct tooth count is critical to matching the designed door speed and thrust for your operator.
