The Genie 086654.2020.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 20-tooth drive sprocket with a 1-1/4 inch bore diameter for direct shaft mounting. Selecting the correct tooth count and bore diameter is critical: an incorrect tooth count produces 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 for use with #41 ANSI roller chain. Using a different chain pitch will result in poor engagement, accelerated wear, and potential drive failure.
A: The 086654.2020.S is the current suffixed part number. The legacy un-suffixed part number 086654.2020 was the predecessor and may appear on older documentation or orders. Both refer to the same sprocket assembly.
A: The sprocket features a 1-1/4 inch bore diameter. Verify the shaft diameter on your specific MH or MJ operator before ordering to ensure a proper fit without modification.
A: This sprocket assembly is confirmed compatible with Genie MH Series and MJ Series commercial trolley-style door operators. Consult Genie documentation before attempting use on other operator models.
A: The sprocket is constructed from steel, providing the durability and load capacity required for commercial door operator drive train applications.
