Product Description QTZ40 Tower Crane 1) Rated moment: 400kN. M 2) Max. Lifting capacity: 4T 3) Max. Working range: 50m 4) The height is 30m when freestanding and fixed, and it can reach 120m when adhered. Over-long boom is (42/47/50), wide range of coverage. Heavy in section of mast section (1500*1500), good steel performance, complete crane is stable and little swing as load. Main material of mast section is (140*140*10). Electric system adopts domestic fine quality or import components, performance is stable and reliable. Mast section, tie bar, upper and lower bracket and so on, main parts all adopt CO2,GSAW with large in weld penetration, small in transformative, mast sections can exchange combination. Hoisting mechanism has good timing performance, rise and fall are stable, shockless. Slewing mechanism adopts winding motor, operating balance, efficient, fast and convenient in position. Standard.