4269807 Original Excavator Parts HOSE for Hitachi ZX330-5G

This hydraulic hose (part number 4269807) is a high-pressure delivery line for the hydraulic system of the Hitachi ZX300LCN-7 excavator. It is directly compatible with the ZX300LCN-7 model and highly compatible with excavators of the ZX300LCN-5A and ZX300-5A series. As a genuine original accessory, this hose is usually one of the high-pressure hose kits for the hydraulic system of the vehicle. It is a standard part in the repair market to replace aging or damaged oil pipes, ensuring reliable transmission of hydraulic oil between pumps, valves, and cylinders.

This hose belongs to high-pressure steel wire wound hydraulic hose, used for transmitting hydraulic oil, and the working pressure can usually reach 35-42 MPa. It adopts a multi-layer composite structure: the inner layer is oil resistant and high-temperature resistant synthetic rubber (such as nitrile rubber), the middle layer is multi-layer high-strength steel wire winding reinforcement layer, and the outer layer is wear-resistant and UV resistant synthetic rubber sheath. The two ends of the hose are crimped with permanent metal joints (such as 24 ° cone seals or flange connections), made of carbon steel or stainless steel, and have undergone rust prevention treatment on the surface. 

Key points for post maintenance and upkeep: 1 Regular inspection: Every 250 working hours, visually inspect the outer surface of the hose for bulges, cracks, cuts, hardening, or leakage marks, with a focus on checking the bends, contact areas with metal parts, and joint roots. 2. Preventive replacement: Considering the aging and fatigue of rubber, it is recommended to perform a preventive replacement of the entire high-pressure hose every 2-3 years or after 6000-8000 hours of operation, even if the appearance is intact, to avoid single pipe burst causing shutdown and hydraulic oil pollution. 3. Installation specifications: When replacing, ensure that the hose runs smoothly and the minimum bending radius is not less than the specified value (usually 5-8 times the outer diameter of the hose), avoiding twisting, stretching, or friction with adjacent components; Tighten the joint according to the specified torque (usually 100-200 N · m) and use anti loosening washers.