JL series oil feeding/oil filtering bogie developed by our company can not only be used as special equipment for oil feeding and filtering of hydraulic system, but also special equipment for filtering pollutants periodically in the medium used in system. Application of this equipment will help to handle pollution of hydraulic system, prolong service life of hydraulic elements, ensure normal operation of the system. Apart from having reliable performance, compact structure, good appearance, convenient maintenance and service, JL oil purifier produced by our company is also featured with high accuracy and low noise. The users may select different filtering cartridges with the size of 3µm,5µm,10µm, 20µm, 30µm, 40µm,50µm, 80µm and 100µm used in the fine filter according to his actual requirement. Therefore, it can meet various accuracy requirements just needing to replace various filter cartridges with different accuracies, and also requirement for high lift oil feeding and oil pump.