4436720 Original 6HK1 engine assembly for excavator ZX330

The original 6HK1 engine assembly (part number 4436720) is the core power unit provided by Isuzu for Hitachi's large excavators, mainly suitable for third-generation models such as ZX330, ZX330-3G, and ZX360-3. This engine is also widely used in excavators of the same tonnage under brands such as Sumitomo SH350. Its universal number 4436720 is its unique identifier in Hitachi's original parts system, corresponding to engine models Isuzu AA-6HK1XQA (direct injection version) or 6HK1X (electronic injection version). When ordering, the complete model, serial number, and engine identification code of the excavator must be provided for verification to ensure that the installation interface, control protocol, and emission standards are fully matched.

This product belongs to a six cylinder, inline, four stroke, water-cooled, turbocharged intercooled diesel engine, which adopts direct injection/high-pressure common rail electronic injection system and complies with China's non road country III/EU Stage IIIA emission standards. Main technical parameters: rated power 184-212 kW/2000 rpm, maximum torque 1080 N · m/1500 rpm, displacement 7.79 L, cylinder diameter × stroke 115 × 125 mm, compression ratio 17.5. The overall size of the machine is approximately 1390 × 1060 × 1260 mm, with a weight of 640 kg. It adopts a top mounted camshaft structure and timing chain transmission, with a spray pressure of up to 180 MPa. Its cooling system adopts a dual thermostat design (opening at 82 ℃ on the intake pipe side and 85 ℃ on the exhaust pipe side), adapted to Hitachi HIOS III hydraulic system, with "intelligent power control" function, which can improve work efficiency and reduce fuel consumption by about 8-12%.

Check the valve clearance (intake and exhaust valve standard 0.40 mm) and belt tension every 500 hours; Detect cylinder pressure every 1000 hours (standard value 3.24 MPa). Oil change: It is recommended to change the engine oil every 500 hours (or 5000 kilometers), using original CD grade or above 15W-40 engine oil with a filling amount of about 41 L. The coolant should be changed every 2 years (or 4000 hours), and the antifreeze concentration should be maintained at 30-60%; Replace HLP-V 46 grade hydraulic oil every 2000 hours. Filter: Clean/replace the air filter every 10000 kilometers; The diesel coarse filter should be replaced every two oil change cycles, and the fine filter should be checked for drainage every 200 hours. Electrical and cooling: Regularly check the radiator pressure cap (standard pressure 0.1 MPa) and cooling water quality; Disconnect the battery power cord during electrical maintenance. If there are problems such as difficulty starting, black smoke emission, power reduction, etc., the fuel injector atomization, cylinder sealing, and fuel system intake should be checked in a timely manner. It is recommended that professional technicians use original tools for maintenance to extend the engine life to 10000-12000 hours.