QTZ40(TC4808) tower crane is a new kind of horizontal, trolleying, top-slewing and self-erecting tower crane. Its free standing height is 30m. The max. Height is 120m, attached height can be adjusted by the height of the building. It is widely used in building, factory, houses and other high-rise building. Its max. Work jib length is 47m, max. Load moment is 400KNm, max. Load is 4t. Wide work range, high efficient, stable processing.