4426383 Original Excavator 6WG1 Engine Assembly for Hitachi

The original engine assembly part number 4426383 is the complete power unit of the ISUZU 6WG1 series diesel engine (displacement 15.7L, power 235-350kW). This assembly is mainly suitable for large hydraulic excavators produced by Hitachi Construction Machinery, such as ZX470LCH-5G, ZX470LCH-3BE, ZX870-3, ZX870-5G, ZX850H and other models. Its common models are often labeled as AH-6WG1XYSA-01, BB-6WG1T, etc., and it is also widely used in excavators of the same tonnage from brands such as Sany (such as SY650H-S, SY485-550), Sumitomo (such as SH480HD-6), and Case. When ordering, the complete machine model and engine serial number must be provided to ensure that the installation interface, electronic control system, and emission standards are fully matched.

This product is an original 6WG1 engine assembly, featuring an inline six cylinder, four stroke, turbocharged intercooler, and water-cooled design. It has a displacement of 15.681-15.7L, a rated power coverage of 235-350kW/1800rpm, and a maximum torque of 2050-2250N · m. It adopts a high-pressure common rail fuel injection system, electronic control unit (ECU), and exhaust gas recirculation (EGR) technology to meet the National IV/V emission standards. The assembly includes the cylinder block, crankshaft, connecting rod, piston, cylinder head, fuel system, lubrication system, cooling system, and electronic control accessories. It is in a remanufactured or brand new original state and has undergone bench testing and dynamic balance calibration to ensure high reliability, low fuel consumption, and long service life under heavy load conditions such as mining and earthwork.

Check the oil level, coolant level, and air filter blockage indicator every 250 working hours; Monitor the engine for abnormal noises, black smoke, and other anomalies. Regular maintenance: replace the engine oil, oil filter, and diesel filter every 500 hours; Clean or replace the air filter every 1000 hours, and check the sealing of the turbocharger, high-pressure oil pump, and common rail system. Overhaul cycle: It is recommended to conduct a comprehensive disassembly and inspection within 8000-10000 working hours, including measuring cylinder pressure, checking valve clearance, replacing piston rings, main shaft bearings, and connecting rod bearings. Installation points: Before replacing the assembly, thoroughly clean the engine compartment, oil circuit, and cooling pipeline; Use original bolts and gaskets during installation, and tighten them step by step according to the torque requirements of the ISUZU maintenance manual (such as cylinder head bolts 200-220N · m); After installation, it is necessary to add the original designated model of engine oil and coolant, and connect the diagnostic instrument for ECU matching and parameter calibration.