Large power engine with high power.Large hydraulic components are used with small pressure loss and high efficiency.1.4 m3 bucket is provided as standard, and the largest bucket capacity of 1.6 m3in the same tonnage is optional.The system pressure is raised from 34 to 37Mpa to improve digging force.The structures of cylinder and main alve are optimized withfast response of quick switching of bucket rod fast liting of big arm and good cordiation of actions.Reinforced four wheels and one belt are used.Ilt is applicable heavy duty working conditions.