QTZ40 TC4708 tower crane, a type of top slewing self-erecting tower crane, as the latest type of crane transportation machinery, it is designed with "Tower Crane Computer-designing Platform" as the tool. In the process of designing, group technology, combination design technology and finite element analysis technology are made full use of in combination of international advanced tower crane technology and the demand of domestic building market.

This machine is the crane with vertical arm support, trolley travel and up-rotary hydraulic jack-up system. Its maximum effective amplitude is 47 m. Its maximum lifting moment is 400kN•m. When used alone, its lifting height is 29 m and attaching lifting height 120 m (α=2).