CAT 5N-4120 PIPE

CAT 5N-4120 is a Caterpillar high-pressure hydraulic hard hose assembly (hydraulic hose) that is compatible with the hydraulic systems of construction machinery such as excavators and loaders. It is used to transport high-pressure hydraulic oil, connect key components such as pumps, valves, and cylinders, ensure stable pressure and smooth flow in the hydraulic circuit, is suitable for medium and high pressure conditions, has a robust structure, is pressure-resistant and vibration-resistant, and has reliable sealing. The following are the core information and key points:

Core Technical Parameters
Item Details
Part Model CAT 5N-4120 (5N4120) High-Pressure Hydraulic Rigid Pipe Assembly, factory prefabricated, including pipe body, connectors, and seals, compatible with Caterpillar construction machinery hydraulic circuits for high-pressure oil delivery

Material Cold-drawn seamless carbon steel (SAE 1020), pipe wall thickness 2.0mm, surface galvanized passivation treatment for corrosion resistance; connectors are nickel-plated carbon steel, seals are nitrile rubber (NBR), compatible with mineral oil, synthetic hydraulic oil, and other media

Key Dimensions Inner diameter 12.7mm (1/2 inch), outer diameter 17.2mm, pipe length 350mm, both ends are JIC 37° tapered seal connectors, connector thread 1/2-20 UNF, installation torque 55-65 N・m, compatible with high-pressure interfaces in hydraulic systems

Compatible Models CAT 320D/323D excavators, 950H/966H This hydraulic system is used in loaders, D6T bulldozers, and other applications, for high-pressure oil circuits from the main pump to the main valve and for cylinder control circuits. The compatible hydraulic pump model is 359-0678, and the main valve model is 445-0812. It is suitable for working pressures up to 35MPa.

Performance Parameters: Working pressure 35MPa (350bar), burst pressure 140MPa, working temperature -40℃ to 120℃, flow rate ≤60L/min, pipe bending radius ≥50mm, vibration resistance frequency 5-200Hz, suitable for high-frequency vibration conditions in construction machinery.

Core Functions and Structural Features: High-pressure oil delivery: Seamless carbon steel material and thick-walled design, suitable for high-pressure conditions in hydraulic systems, preventing pipe rupture and leakage, ensuring stable power transmission to hydraulic actuators, and avoiding equipment downtime and safety hazards caused by oil leakage.

Reliable Sealing: JIC 37° cone sealing joints, combined with nitrile rubber seals, form a reliable seal after installation, preventing high-pressure oil leakage. Suitable for high-pressure reciprocating impact conditions, the seal life is ≥8000 working hours.

Vibration Resistance and Corrosion Protection: The pipe body surface is galvanized and passivated, and the joints are nickel-plated, enhancing corrosion resistance and making it suitable for harsh outdoor working conditions in engineering machinery. The prefabricated pipe body absorbs vibration, reducing the risk of joint loosening and ensuring long-term stable operation of the hydraulic circuit.

Easy Installation: Prefabricated rigid pipes with crimped joints at both ends require only alignment and tightening during installation. No on-site crimping is needed, improving maintenance efficiency, ensuring precise pipeline routing, and adapting to the internal space layout of equipment.