QTZ31.5,25 Series Tower Crane model QTZ4206 Maximum rated torque(KN?m) 315 Maximum lifting load(t) 3t Maximum working amplitude(m) 42,38.6,35,30 Hoisting height (m) Independent 29 Adhere 90 Lifting capacity at jib tip(t) 0.6 Hoisting speed (m/min) a=2 53/26.5/6.7 a=4 Radius changing speed(m/min) 53/26.5/6.7 Swiveling speed(r/min) 0.38/0.7 Climbing speed(m/min) 0.4 Dead load(t) 29.6/18.3 Upper chord of lifting beam φ76?4.5 φ76?6 Standard section dimensions(mm) 1494?1494?2200 Matching motor Three speeds Double speeds Materials of lifting mast ∠140?10 ∠125?10 ∠100?10 Q235B Parallel height of lifting beam(mm) 1040