With the National III standard Cummins six cylinder engine, XE200DA has sufficient torque reserve, customized power and low fuel consumption. The reliability is improved by optimizing the structure of shaft base forgings and eliminating weld defects. The mechanical characteristics of the boom are greatly improved by adding dovetail stiffening plate at the root and increasing the thickness of the front fork plate. With multi-stage protection of fuel system, three-stage filtration of fuel system, quick release of water in the diesel tank, new added breathing valve on diesel tank, the possibility of water and impurities intrusive into the engine is reduced.