4444166 Original 4JG1 engine assembly for excavator ZX70

The original 4JG1 engine assembly (part number 4444166) is the core power unit provided by Isuzu for Hitachi small excavators, mainly suitable for ZX70, ZX60, ZX55 and other series of small models. This engine is also widely used in small excavators from brands such as Sany SY55/SY65/SY75, Doosan 55, Kato 307, Caterpillar 307, Shengang SK60/SK70, XCMG 65, Xiamen Gong 808, and Jiexibo 65. Its universal number 4444166 is its unique identifier in Hitachi's original parts system, corresponding to the engine model CC-4JG1. 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 four cylinder, water-cooled, four stroke, inline, naturally aspirated diesel engine that uses a direct injection fuel system and complies with China's non road country II/European IIA emission standards. Main technical parameters: rated power of 40.5 kW/2000 rpm, maximum torque of 188 N · m/1800 rpm, displacement of 3.318 L, cylinder diameter x stroke of 95.4 x 107 mm, compression ratio of 17.5, fuel consumption rate ≤ 234 g/kWh. The overall size of the machine is about 800 × 600 × 900 mm, with a weight of about 280 kg. It adopts a top mounted camshaft two valve structure and is equipped with a mechanical fuel pump and an integrated oil pump. 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's three variable piston pump+gear pump hydraulic system, with a rated speed of 2100 rpm, and can operate stably in ambient temperatures ranging from -20 ° C to+40 ° C.

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 2.5-3.0 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 12 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 8000-10000 hours.