4348414 Excavator Hydraulic Pump Rubber Hose for Hitachi ZX200-3G

4348414 is its part number. This part is an original rubber hose specially designed by Hitachi for the hydraulic pump of the ZX200-3G hydraulic excavator. Its universal models usually cover 20-22 ton same platform models such as ZX200-3G, ZX200-5G, ZX210-3, etc., mainly used to connect the return or suction pipelines between hydraulic pumps and hydraulic oil tanks. As the designated pipeline of the original factory, its inner diameter, length, pressure resistance level, and specifications of the two end joints are fully matched with the interface of the pump and oil tank

This product is an oil resistant rubber hose with a braided reinforcement layer. The tube body is a straight cylindrical shape and is made of black oil resistant synthetic rubber, which has excellent ozone resistance and aging resistance. The fine horizontal texture visible on the outer surface is a structural manifestation of the internal high-strength fiber or steel wire weaving reinforcement layer, which enables it to withstand system working pressure and possible negative pressure (oil absorption conditions). The inner wall is extremely smooth to reduce oil flow resistance. The typical working pressure depends on the application (the return pipe is relatively low, about 0.1-0.5 MPa; The oil suction pipe needs to withstand negative pressure, with a working temperature range of -30 ℃ to+100 ℃, and can be immersed in hydraulic oil for a long time.

Inspection and replacement cycle: It is recommended to inspect every 2000 working hours or every 2 years, and shorten the cycle in high temperature and severe vibration working environments. Daily inspection: Focus on checking the surface of the hose for bulges, cracks, hardening, cracking, and any abnormal friction marks with adjacent components. Replacement and installation: 1 Pressure relief and cleaning: Ensure that the hydraulic system has been depressurized before replacement. Thoroughly clean the metal joints at both ends. 2. Alignment installation: Insert the new hose (4348414) straight and aligned onto the joint to avoid twisting. 3. Tightening clamps: Special clamps must be used to tighten the reinforced layer of the hose, and the torque should be tightened according to the manual requirements (usually 5-8 N · m). 4. Exhaust and leakage testing: After installation, start the engine and run it at idle speed to check for any leaks at the interface.