Supply PowerMaster model "CJ" industrial duty hoist type operator for Carwash type applications on Sectional Doors with High Lift or Vertical Lift and Rolling Service Doors and Grilles. Primary reduction shall be by heavy duty V-Belt Drive. Secondary reduction shall be a chain and sprocket arrangement. Reduction stages shall be arranged so that mechanism is self locking when torque is applied at output shaft. All reduction shafts shall be a minimum of 1" in diameter, supported by bronze oilite bearings. Operator shall provide an adjustable torque limiting clutch.