The Linear 220499 HBT Drive Sprocket is a replacement component engineered for Linear (Nortek Control) HBT commercial door operators. Positioned in the operator’s chain reduction assembly, this sprocket transmits motor power to the output shaft, helping lift and lower sectional or rolling steel doors smoothly and consistently. It is intended for service and repair of Linear HBT operators in commercial and industrial settings such as warehouses, service bays, and parking facilities where dependable chain-drive performance is required.
Use this part when the original sprocket shows wear, noise, or inconsistent motion. For proper fit, match the 220499 part number to the HBT operator’s documentation before ordering, as sprocket configurations can vary by production run. Installation should be performed by a qualified door technician: disconnect power, remove the chain guard, relieve chain tension, transfer any keys or retainers from the old sprocket, align the new sprocket with the mating chain, set correct chain tension, and verify travel limits and entrapment protections after reassembly. This part is specific to Linear HBT operators and is not a universal sprocket; consult the Linear/Nortek Control manual or technical support to confirm compatibility with your unit.