There are inclined grooves on the surface of the oil grinding plunger pump, which are connected to the top through radial and axial holes, with the aim of changing the circulating oil supply quantity; The plunger sleeve is equipped with inlet and outlet oil holes, both of which are connected to the low-pressure oil chamber in the pump upper body. After the plunger sleeve is inserted into the pump upper body, it should be positioned with positioning screws. The position of the inclined groove at the plunger head varies, and the method of changing the fuel supply quantity also varies. The YUKEN Oil Research A37 plunger pump is widely used in injection molding machines, hydraulic presses, steel mills, machine tools, walking machinery, hydraulic elevators, and environmental protection factories, maritime engineering, die-casting machines, and walking machinery.