Crane main performance parameters indicators: Lifting range. Amplitude: the amplitude of the rotation arm erecting cranes means turning the horizontal centerline of the extract from the plumb line means between buying Tadano crane 20 tons, the unit is m. Non-rotating type of jib crane spreader centerline magnitude refers to water or other typical second-hand arm rear axle between the axes Tadano crane 20 tons, the horizontal distance. Crane main performance parameters indicators: speed. Crane speed: carts running speed is the speed crane on a level surface or orbit with rated load 20 tons Tadano cranes for sale, units of m / min. Car speed: the speed of the trolley refers to a stable state of motion, the car on a level track speed load ratings of units of m / min.