... 1, There is torque limiter system to prevent the damage by Lock-Rotor, it make the motor durable. Product DescriptionHuge tonnage beam type ... unit, extremely low design and huge to nnage, rotation of crane hook by geared motor and elastic coupling. Specification 1, There ... . 3, With simple construction easy for repairing 4, The lifting capacity is more than 100 Ton. 5, Modified pulleys on request.