XP00000008PS Genuine Hitachi O-ring kit for ZX200-3 excavator

Part number XP00000008PS is a dedicated O - ring seal kit for the overhaul of the main control valve (MCV) of Hitachi ZX200 - 3/ZX330-3 excavators. It is compatible with the main control valves of Zaxis - 3 series excavators such as ZX200-3/ZX240-3/ZX330-3, as well as models with the same main control valve like ZX210-3/ZX225US-3/ZX250LC-3. It is made of a combination of NBR nitrile rubber (oil - resistant, temperature - resistant from - 30℃ to 120℃) and fluororubber FKM (high - pressure resistant, chemical - resistant, suitable for high - pressure oil circuits). The kit contains 120-150 O - rings of different specifications (including standard, thickened and dust - proof types), which are suitable for key sealing parts of the main control valve such as the valve cover, valve stem, oil port and pilot interface. It is suitable for the 31.5MPa high - pressure hydraulic system, ensuring the oil circuit sealing and pressure stability of the main control valve. It is also compatible with the Isuzu 4HK1/6HK1 engine hydraulic system, preventing oil leakage and pressure loss.

Its core function is to replace all O - rings during the overhaul of the main control valve, preventing internal and external leakage at parts such as the valve cover, valve stem and oil port, maintaining the pressure stability of the hydraulic system, and reducing failures such as valve stem jamming, slow movement and power loss caused by seal failure. The NBR material is suitable for low - pressure and medium - pressure oil circuits, while the FKM material is suitable for high - pressure and high - temperature oil circuits. The O - rings have a dimensional accuracy of ±0.05mm, a hardness of 70±5 Shore A, a tensile strength of ≥18MPa, an elongation at break of ≥300%, and excellent anti - aging performance. They are suitable for the working conditions of excavators with heavy dust, vibration and large temperature differences. The average service life is ≥8000 hours, ensuring the long - term and efficient operation of the main control valve and reducing hydraulic oil consumption and environmental pollution.

Before replacement, release the pressure of the hydraulic system. When disassembling the main control valve, remove the fixing bolts with a torque of 8-10N·m. Clean the valve seat and sealing groove (free of burrs, oil stains and impurities). When installing, apply special hydraulic oil to the O - rings (do not use grease), install them according to the corresponding specifications, and tighten the bolts symmetrically (torque 8-10N·m). After installation, conduct a pressure test (no leakage at 31.5MPa) and check the flexibility of the valve core movement. This seal kit can reduce the leakage failure rate of the main control valve by more than 90%, reduce hydraulic oil loss by 40%, increase the response speed of the hydraulic system by 15%, extend the service life of the main control valve and hydraulic components, and reduce maintenance costs and downtime.