Abstract:The LHD is an important transportation equipment for modern mining, and the work and steering hydraulic system is the core unit of the entire“L”type shovel,in which the dualpump confluence technologyis adopted. According to the structural characteristics and working characteristics of the work and steering hydraulic system, based on the graphical physical modeling of Automation Studio, the parameters of the variable pump, oil pipeline, valve body, cylinder and other important components in the hydraulic working system were built. The hydraulic pump’s inlet and outlet pressure distributions, power consumption, and speeds of various subsystems were analyzed under various operating conditions to verify the rationality of the working pump and steering pump pressure and to analyze their working characteristics. The results show that the pressure changes of the working oil pump and the steering oil pump are within the set pressure range of the system safety valve under various working conditions; the maximum power consumption of the working oil pump and the steering oil pump occurs during the scraper shoveling and digging working conditions, up to 170 kW. At the same time, the boom requires a large amount of energy under full-load lifting conditions.The analysis results provide a theoretical basis for further study of power and torque distribution under various operating conditions.