Excavator cab lift system to repack the product is a tradition in jining day, engineering machinery research and development production of hydraulic excavator cab are fixed structure, vision is not enough, can't meet the requirements, can lift the cab hydraulic excavator can meet the special requirements of this product on the basis of general hydraulic excavator cab suspension on hydraulic lifting mechanism, determined by the output logic operation, realize the bridge lifting, implement the constant speed control of the product can significantly reduce the user's purchase of maintenance costs, and the can be applied to the specialization of fine ore and log characteristics of port loading and unloading Steel mill scrap loading rail bulk logistics transfer station and other special needs need to expand the scope of vision