Crane use and maintenance: Running characteristic period. Faster wear rate. Since the impact of the new machinery parts processing, assembly and adjustment and other factors, the friction surface roughness smaller contact area with the surface, uneven surface pressure situation. The machine during operation Tadano crane 65 tons, concave and convex portions are mutually fitted parts of the surface friction of used 65 tons of cranes, grind down to the metal debris, and as an abrasive, friction continued participation Used 65 tons crane price, but also accelerated the parts with the worn surface. Crane Development origin: history. Early 20th century, Europe began to use the tower crane. Crane hoisting mechanism mainly run institutions, luffing mechanism, slewing mechanism and metal structure. Hoisting mechanism is the basic working body of the crane, mostly by hanging system and winch composition, but also lift weights through the hydraulic system.