4370435 Excavator Filter Element for ZX200

The original filter element part number 4370435 is the core component of the hydraulic oil filtration system provided by Hitachi Construction Machinery for the ZX200 series hydraulic excavator (equipped with the ISUZU 6BG1T engine). This filter element is mainly used to filter metal debris, seal debris, and particulate pollutants in hydraulic oil, protecting precision components such as hydraulic pumps and control valves. Its universal model includes P173238 (Donaldson part number) and is widely applicable to Hitachi excavators of the ZX200-3, ZX200-5, ZX210-3, ZX240, ZX330, ZX360-3, ZX450 series, as well as early models such as EX200, EX220, EX300, EX330, etc. As an integrated design from the original factory, it is deeply matched with the hydraulic pipeline of the entire vehicle. The use of non-standard auxiliary filter elements is strictly prohibited to ensure filtration accuracy and system reliability.

This product is an original hydraulic oil filter element (belonging to the pilot filter element category), which adopts a high-efficiency filter paper folding structure (chrysanthemum shaped design to increase the filtering area), made of glass fiber composite filter material, and the shell is made of metal mesh or punched steel shell. Main technical parameters: outer diameter of about 94mm, height of about 205mm, interface thread M22 × 1.5, filtration accuracy ≤ 10 μ m, working temperature range -30 ℃ to+120 ℃, maximum working pressure difference ≤ 0.5MPa. This filter element meets the ISO 3968 hydraulic filter element testing standard and is suitable for harsh working conditions such as high vibration, high dust, and large temperature differences in excavators. It can effectively remove more than 95% of particles larger than 10 μ m in the oil, ensuring that the cleanliness of the hydraulic system reaches NAS level 9 or above.

Replacement cycle: It is recommended to replace every 500 working hours or every 6 months (whichever comes first); If working in dusty and high load environments, it should be shortened to every 250 working hours. Replacement steps: 1 Release hydraulic system pressure (operate the handle to release pressure at each action position); 2. Positioning filter element (usually located on the hydraulic oil tank or pilot oil circuit); 3. Disassemble old parts (use a special wrench and place an oil pan below); 4. Install new parts (pay attention to the arrow indicating the direction of oil flow and ensure that the sealing ring is intact); 5. System re inspection (start the engine and run it at idle speed, check that there is no leakage at each interface). Fault diagnosis: If there is slow hydraulic action, system overheating, or unstable pilot pressure, check whether the filter element is blocked; If the hydraulic oil pollution alarm light is on, replace the filter element immediately and check the oil quality