FILTER OF HYDRAULIC SYSTEM. The hydraulic system filter is an essential component of the vehicle hydraulic drive system designed to clean the working fluid from mechanical contaminants, wear particles and other foreign substances that may enter the hydraulic circuit during operation. This component protects critical hydraulic system elements such as pumps, control valves, distributors, hydraulic cylinders and other components from premature wear and damage. The primary function of the filter is to maintain the cleanliness of the hydraulic fluid circulating within the system and transmitting force between various actuators. Clean hydraulic fluid is essential for stable system operation, precise control and long service life of hydraulic components. The filter captures metal shavings, dust, seal wear particles and other contaminants generated during system operation. The filter construction typically includes a housing and a filtering element made of special filter paper, synthetic fibers or fine metal mesh. The filtering element provides efficient fluid purification while maintaining sufficient flow capacity required for proper circulation of the hydraulic medium. Materials used for the filter are selected for resistance to hydraulic fluids, operating pressure, temperature fluctuations and long‑term operation under heavy loads. A properly functioning hydraulic system filter ensures reliable operation of hydraulic equipment, prevents clogging of channels and valves and helps extend the service life of the entire hydraulic system. The catalog includes hydraulic system filters of various types designed for installation in hydraulic lines, pump assemblies and reservoirs used in vehicles and specialized machinery.