4348419 Original Excavator Rubber Hose for EX100-3

Hitachi original excavator rubber hose (universal part number: 4348419) is a key connecting component for conveying high-pressure oil in hydraulic systems. According to the universal compatibility information of Hitachi genuine parts, this hose assembly is widely compatible with multiple series of hydraulic excavators from Hitachi, including the ZX series (such as ZX200, ZX210, ZX240, ZX250, ZX330, etc.), EX series, and some wheeled excavators. It may be applied to key high-pressure oil circuits such as main pump to multi way valve, multi way valve to oil cylinder, or rotary/walking motor.

This rubber hose is the core component that ensures stable transmission of hydraulic power. As an original component, it adopts a multi-layer composite structure that meets strict engineering machinery standards: the inner rubber layer is usually made of hydrogenated nitrile rubber (HNBR) or similar synthetic rubber that is resistant to hydraulic oil and high temperature, ensuring long-term compatibility with the oil and resistance to expansion and aging; The reinforcement layer is made of high-strength steel wire woven or wound, providing extremely high pressure bearing capacity and anti pulse fatigue performance. The working pressure can usually reach 35MPa or higher, and can withstand system pressure impact

The maintenance core of rubber hoses lies in regular inspection, preventive replacement, and correct installation. Firstly, a regular inspection system should be established (recommended every 250 working hours or daily pre shift inspection), focusing on checking whether the outer rubber layer of the hose has bulges, cracks, cuts, hardening or abnormal wear, and whether there is leakage, rust or looseness at the joints. Secondly, it is necessary to closely monitor the working status of the hose. If abnormal vibration, local overheating, or unstable system pressure is found, the machine should be stopped immediately for inspection.