4654984 Excavator U-shaped Radiator Hose for Hitachi ZX470

Part number 4654984 is a specialized part number for the U-shaped radiator hose of Hitachi's original excavator. This hose is a critical component of the engine cooling system, typically used to connect the engine outlet to the radiator inlet (upper water pipe) or the radiator outlet to the engine inlet (lower water pipe), forming a "U" - shaped or approximately "U" - shaped coolant circulation channel. As an original standard component, it may be compatible with multiple series of Hitachi hydraulic excavators, such as the ZX series (such as ZX120-3, ZX200, ZX330-3, etc.) and the EX series (such as EX120-1, EX200-6, EX300-2, etc.), which are common models.

The U-shaped radiator hose is the core pipeline for transporting high-temperature coolant in the engine cooling system. Its core function is to establish a closed coolant circulation channel between the engine and the radiator, efficiently delivering the high-temperature coolant (up to 95-105 ℃) generated by the engine to the radiator for cooling, and then sending the cooled liquid back to the engine to maintain the engine within the optimal operating temperature range and prevent overheating damage. It has excellent heat resistance (long-term working temperature -40 ℃ to 125 ℃), pressure resistance, resistance to chemical corrosion of coolant, as well as good flexibility and fatigue resistance. It can withstand severe vibrations, thermal cycles, and pressure fluctuations during continuous operation of excavators, ensuring long-term reliable sealing of the cooling system without leakage or deformation.

The maintenance core of this hose lies in regular inspection, preventive replacement, and standardized installation. The radiator hose is a rubber consumable part, and it is usually recommended to perform preventive replacement every 2-3 years of operation or accumulated 3000-5000 hours of operation. Once any signs of aging are found, it should be replaced immediately without delay to avoid bursting during driving and causing severe engine overheating. The lifespan of the hose is directly related to the quality of the coolant and the replacement cycle. It is necessary to use the specified type of antifreeze coolant and replace it regularly (usually every 2 years or 4000 hours) to maintain its chemical stability and anti-corrosion performance. Keep the exterior of the radiator clean to prevent oil stains from corroding the hoses.