Tower Crane 1.CE, ISO 2.a leading one in ... of the Group cover QTZ series tower crane,engineering machinery,single/twin beam bridge crane.It was selected as "Designated Products ... hydraulic jacking system, as to increase or decrease the tower body standard mast section, which can lift up or ... .5.It is widely used with many working modes, and it is applied in extensive projects 10t self erecting tower crane ...