Tower Crane 1.CE, ISO 2.a leading one in China ... .The main products of the Group cover QTZ series tower crane,engineering machinery,single/twin beam bridge crane.It was selected as "Designated ... the hydraulic jacking system, as to increase or decrease the tower body standard mast section, which can lift up or down ... with anchoring160mMast section1.837×1.837×2.8m 6t(8t) TOWER CRANE QTZ5020 TIP LOAD 2t