Topless tower crane QTZ2800 hoisting Operating speed ( m/ min) Hoist weight ( t) 0-6 70-140 0-12 35-70 0-24 17.5-35 0-48 0-17.5 trolleying m/ min 0-20 Slewing r/ min 0-0.3 Jacking m/ min 0-0.3 Power supply 380V/ 50HZ Necessary power supply 60KVA Mast section 3.25* 3.25* 6 m