YD00001201 Original 4TNV94 engine assembly for Hitachi ZX68USR-5A excavators

The engine assembly (part number YD00001201) is the original power core of the Hitachi ZX68USR-5A excavator. It is directly compatible with the ZX68USR-5A model and is commonly used in Hitachi ZX series small excavators on the same platform, including ZX55USR-5A, ZX70USR-5A, etc. This assembly is supplied as an original replacement part in the maintenance market, and its corresponding engine model is Yanmar 4TNV94L-ZWHB, reflecting the standardized design of Hitachi's small excavator power system.

The engine assembly is a 4-stroke, water-cooled, direct injection diesel engine, with core parameters including: rated power of 34.1kW (45.7 horsepower), rated speed of 2000r/min, maximum torque of 204N · m/1200r/min, total displacement of 3.053L, 4 cylinders, cylinder diameter x stroke of 94mm x 110mm. As an assembly component, it includes the engine body, crankshaft connecting rod mechanism, valve train, fuel supply system (including high-pressure oil pump, injector), 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 in a compact structure.

Key points for post maintenance and upkeep: 1 Oil management: Change the engine oil after 50 hours of first use, and then change it every 500 hours or every 6 months thereafter. It is recommended to use 15W-40 diesel engine oil with CF-4 grade or above, and change 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 atomization status of the fuel 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.