... hook hight(141-280M); Max load (6-20T)3. luffing jib tower crane:Jib lenght(30-50M);Max under hook hight(103 ... , the quality is the same with exporting supplier "Potain " .( 5 ) Luffing mechanism is double-speed cone rotor motor, so It’sneedn ... .( 9 ) Basic mast section : square strengthened steel, repeatedlyapplicable, convenient in tower crane displacement. But lower in cost.( 10 ) Mast section : 3 ...