T/S and T/L reducers for port cranes are devices that connect to T/S and T/L devices of the cranes, reduce the rotational power of the motors, and control the movement of the cranes. The performance of the reducers, such as reduction ratio, torque, efficiency, durability, etc., is important, so they have to be designed, purchased, manufactured, installed, and tested considering the oil leakage problem (environmental violation) and the weight problem(smaller) because they are installed near the sea. We are currently supplying more than 600 units of T/S and T/L reducers annually, and we have completed the preparation to supply all the reducers(T/S, T/L reducers + Main reducers) for port cranes.