4681386 Original Excavator Air Hose for Hitachi ZX450-3

Part number 4681386 is the original air hose used by Hitachi Construction Machinery for the ZX450-3 model (with a total working weight of approximately 45 tons) large hydraulic excavator. The universal model of this hose usually covers the same platform models as ZX450-3, such as ZX470-3, ZX400-3, etc., and is used to connect components such as turbocharger outlet, intercooler, intake manifold, etc. As a designated pipeline by the original factory, its length, diameter, and shape of the two end joints perfectly match the limited space layout of the engine compartment. It is strictly prohibited to use non original pipelines with dimensions or materials that do not match, in order to avoid intake leakage, pressure loss, engine power reduction, or unfiltered air intrusion.

This product is a high-temperature resistant reinforced silicone air hose, with a reddish brown body and a fine concentric ring texture on the surface. This design not only enhances the appearance recognition, but also improves the flexibility, resistance to twisting and compression of the tube body. The material is high-quality silicone rubber, usually with polyester fiber or aramid fiber woven reinforcement layer inside, to withstand the high pressure, pulse airflow (working pressure can reach 0.3-0.5MPa) and high temperature after turbocharging. Its temperature resistance range is extremely wide, usually from -50 ℃ to+200 ℃, and it can tightly adhere to the high-temperature turbocharger housing without aging or cracking. Both ends are designed with specific expansion or straight mouth structures to achieve reliable airtight connection with metal joints through high-performance spring clamps. Its core function is to ensure zero leakage transmission of high-temperature air after pressurization in harsh environments with severe vibration and alternating cold and hot conditions.

Installation specifications: 1 Inspection: Before installation, check the inner and outer surfaces of the new hose for manufacturing defects and cracks, and verify whether the diameters at both ends match the vehicle joints. 2. Cleaning: Use a lint free cloth to clean the connection surface of the metal joints at both ends, ensuring that there is no dust, oil stains, or burrs. 3. Lubrication: A thin layer of silicone grease can be applied to the surface of the metal joint to reduce installation resistance and protect the lip of the hose. 4. Alignment installation: Use your hand to push the hose straight and evenly into the metal joint until it is fully in place, avoiding twisting. 5. Tighten the clamp: A specialized clamp tool must be used to install the clamp on the reinforced part of the hose, and the torque required in the maintenance manual (usually 5-8 N · m) must be tightened to ensure that the clamp is in the correct position and does not cut into the pipe body