8973060634 Original Excavator Isuzu 4HK1 Engine High-pressure Oil Pump Common Rail

Part number 8973060634 (also known as 8-97306063-4) is an original high-pressure oil pump common rail (or common rail groove, common rail pipe) specifically designed for the Isuzu 4HK1 diesel engine. This component is the core high-pressure accumulator of the engine electronic control high-pressure common rail fuel injection system, used to receive high-pressure fuel generated by the high-pressure fuel pump, store it at a constant pressure, and then evenly and stably distribute it to each cylinder injector through the high-pressure fuel pipe, ensuring that the injection pressure is not affected by engine speed and load fluctuations, and achieving precise and efficient fuel injection. As an original standard component, it is mainly suitable for Hitachi's various hydraulic excavators equipped with Isuzu 4HK1 engine, such as ZX200-3, ZX240-3, ZX270-3, ZX330-3, ZX350-3 and other models.

The original high-pressure fuel pump common rail is the core high-pressure component of the engine fuel system. Its core function is to act as a high-pressure accumulator (Common Rail), under the management of the electronic control unit (ECU), maintaining a very high constant pressure inside the fuel system (usually up to 1600-1800 bar or even higher), providing a stable and high-pressure fuel source for injectors, thereby achieving multiple injections, precise control of injection quantity and timing, significantly improving combustion efficiency, reducing fuel consumption and emissions. It is usually made of high-strength alloy steel, with precision machining and polishing inside, and has extremely high compressive strength and fatigue resistance. It integrates key accessories such as pressure sensors and pressure limiting valves (relief valves), which can monitor the pressure inside the rail in real time and safely release it in case of overpressure.

The maintenance core of the high-pressure oil pump common rail is to ensure its sealing, cleanliness, and the normal operation of the pressure monitoring system. Regular inspection: It is recommended to combine regular maintenance every 500 working hours. Cleaning and protection: Keep the common rail pipe and surrounding area clean to prevent dust and dirt accumulation. High quality low sulfur diesel that meets the standards must be used, and the fuel filter must be replaced regularly to prevent impurities from wearing down the inner wall of the common rail or clogging the fuel injector. Fault handling: If there is unstable rail pressure, engine torque limit, or malfunction light on (such as P0087 low fuel pressure, P0088 high fuel pressure, etc.), it may involve issues with the common rail system. Any disassembly, installation, or replacement involving common rail pipes must be carried out by professional maintenance personnel using specialized tools, and the high-voltage connectors must be tightened strictly according to the torque and sequence specified in the maintenance manual.