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PC300-8 PC400-8 Excavator Reservoir Tank 419-03-21320 Original Parts Coolant Expansion Tank Reservoir for Excavator Cooling System

EPDM (Ethylene Propylene Diene Monomer) rubber - Most common, excellent heat and coolant resistance.

Heat-resistant synthetic rubber compound (continuous use up to 120-140°C).

Coolant/antifreeze resistant formulation - Resists glycol-based and OAT coolants.

Ozone-resistant compound - Prevents cracking from atmospheric ozone exposure.

Flexible yet durable elastomer - Withstands vibration and minor impacts.

Aging-resistant polymer blend - Formulated for long service life underhood.

Chemical-resistant to oil and fuel splash - From incidental contact in engine bay.

Pressure-rated construction - Withstands system pressure (typically 0.5-1.5 bar).

Low-temperature flexible - Remains pliable in sub-zero conditions.

UV-stabilized outer layer - If exposed to sunlight, resists UV degradation.

Multi-layer construction - Sometimes with inner barrier layer for low permeation.

Molded-in reinforcement ribs - For structural strength and shape retention.

Molded-in mounting brackets - Integral part of the rubber housing.

Precision-molded spouts and necks - For secure hose and cap connection.

Flame-retardant additive package (some formulations).

Anti-static compound - Prevents dust attraction in some applications.

Mineral-filled compound - For cost and stiffness adjustment.

Carbon black filled - For UV protection and strength.

Peroxide-cured EPDM - For superior heat resistance over sulfur-cured.

Low-permeability liner (in some designs) - To reduce coolant vapor loss.

Synthetic rubber blend (e.g., EPDM/NBR blend) for specific properties.

Color-stable compound (typically black).

Seamless rotational molding or blow molding - For one-piece tank construction.

Molded-in sight glass or level indicator window (if applicable).

Bonded or over-molded metal inserts - For threaded fittings or brackets.

High tear strength formulation.

Resistant to coolant additive packages (silicates, nitrates, etc.).

Hydrolytically stable - Resists breakdown from hot, pressurized coolant/water.

Compatibly formulated with adjacent plastics (e.g., PP, PA) to prevent material interaction.

Manufacturer-specified OEM grade material - Meeting exact automotive/equipment durability standards.

    Introduction to Upper Radiator Hose for an Excavator

    The upper radiator hose is a critical component in the cooling system of an excavator. It plays a vital role in maintaining optimal engine temperature by facilitating the flow of coolant between the engine and the radiator. Here’s an overview of its function, importance, and considerations for maintenance:

    Function

    Coolant Circulation: The upper radiator hose transports hot coolant from the engine to the radiator. As the engine operates, it generates heat, and the coolant absorbs this heat to prevent overheating.

    Heat Exchange: Once the hot coolant reaches the radiator, it passes through the radiator core, where it is cooled by airflow (either from the movement of the excavator or from a fan). The cooled coolant then returns to the engine via the lower radiator hose.

    Pressure Regulation: The upper radiator hose is designed to withstand the pressure generated within the cooling system, ensuring that coolant flows efficiently without leaks.

    Importance

    Engine Protection: A properly functioning upper radiator hose is essential for preventing engine overheating, which can lead to severe damage and costly repairs.

    System Efficiency: An efficient cooling system ensures that the excavator operates at optimal performance, enhancing productivity and fuel efficiency.

    Preventing Leaks: A worn or damaged upper radiator hose can lead to coolant leaks, resulting in low coolant levels and potential engine failure.

     

    Maintenance Considerations

    Regular Inspections: Periodically check the upper radiator hose for signs of wear, such as cracks, bulges, or leaks. Inspect the hose clamps to ensure they are secure.

    Replace When Necessary: If any damage is detected, replace the upper radiator hose promptly to avoid overheating issues. It’s advisable to replace hoses as part of routine maintenance, especially if they are several years old.

    Use Quality Parts: When replacing the upper radiator hose, use high-quality OEM (Original Equipment Manufacturer) or equivalent parts to ensure compatibility and durability.

    Check Coolant Levels: Regularly monitor the coolant levels in the system. Low levels can indicate a leak in the upper radiator hose or elsewhere in the cooling system.

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