Original engine assembly for Hitachi ZX200-5B excavators

The engine assembly (part number YA00049477) is the original power core of the Hitachi ZX200-5B excavator. It is directly compatible with the ZX225USLC-5B model and is compatible with Hitachi ZX225 series models on the same platform, including ZX225USR-5B, ZX225USLC-3, etc. This assembly is supplied as a factory replacement in the maintenance market, with corresponding engine models of Isuzu AA-6BGIT or AI-4HK1X series, reflecting the standardized design of Hitachi's 22 ton excavator power system.

The engine assembly is a 4-stroke, water-cooled, direct injection diesel engine that uses turbocharging and intercooler technology. The core parameters include: rated power of approximately 109.6-122 kW (147-163 horsepower)/2000-2100 r/min, maximum torque of approximately 650 N · m/1400 r/min, total displacement of 5.2-6.5 L, 6 cylinders, cylinder diameter x stroke of approximately 105 mm x 125 mm. As an assembly component, it includes the engine body, crankshaft connecting rod mechanism, valve train mechanism, high-pressure common rail fuel system (including fuel injection pump and injector), turbocharger, intercooler, lubrication system (oil pump, filter), cooling system (water pump, thermostat), and starting system and other complete components. The production process adopts precision casting and CNC machining, and the surfaces of key moving parts are specially hardened to ensure high reliability, low fuel consumption, and low emissions under heavy load conditions.

Key points for post maintenance and upkeep: 1 Oil management: Change the engine oil after 250 hours of initial operation, and then change it every 500 hours or every 6 months thereafter. It is recommended to use CH-4 grade or above 15W-40 diesel engine oil and replace the oil filter at the same time. 2. Fuel system: Use clean diesel above the national standard, replace the diesel filter every 1000 hours, and regularly check the working status of the high-pressure fuel pump and injector. 3. Cooling system: Check the coolant level daily, replace the antifreeze every 2000 hours, and regularly clean the surface debris of the radiator. 4. Air intake system: Clean the air filter every 250 hours and replace it every 1000 hours to ensure smooth air intake.