The Genie 086654.6020.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 60-tooth drive sprocket with a 1-1/4 inch bore diameter. Note: a 60-tooth 1-inch bore variant (075004.0007.S) also exists - bore diameter must match 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: The 086654.6020.S is specifically bored to 1-1/4 inch. The alternate 60-tooth sprocket 075004.0007.S uses a 1-inch bore. Using the wrong bore size will result in an improper shaft fit and potential drive failure, so confirm your operator output shaft diameter before ordering.
A: This sprocket is designed for ANSI #41 roller chain, which has a 1/2 inch pitch. Do not substitute #40 or #50 chain, as pitch and tooth geometry differ and will cause premature wear or drive failure.
A: This sprocket is paired with the 086654.2020.S, which is the 20-tooth 1-1/4 inch bore sprocket in the same 086654 family. The two sprockets together establish the drive ratio for the MH and MJ operator chain drive system.
A: The sprocket assembly is constructed of steel for durability in commercial door operator service. No special coating or stainless variant is indicated for this part number suffix.
A: With a 60-tooth driven sprocket paired against the 20-tooth drive sprocket (086654.2020.S), the drive ratio is 3:1, meaning the operator motor shaft turns three times for every one full rotation of the driven sprocket. This ratio is engineered into the MH and MJ operator design.
