TC4708-QTZ40 4T Hammerhead Tower Crane 1. Hoisting system: the large-scale luffing tower crane is equipped with heavy main hoisting system. Big lifting capacity. 2. Height: the crane can climb following the the building structure due to the use of special climbing system. The lifting height has increased largely. 3.Convenient to use : big rolling angle of the crane boom, small rear turning radius ,suitable for the small construction site,suitable for the crossover work of the cranes. 4. Good performance: good performance of the boom combination, can realize the multiple working range. 5. High safety: the machine is equipped with the safety monitoring system. Display the the working conditions of the cranes all the time.