6704175028 Loader Rubber Hose for ZW370

Hitachi original loader rubber hose (part number: 6704175028) is a critical flexible connecting pipeline used for hydraulic, fuel, or cooling systems. As an original accessory, it is usually compatible with Hitachi ZW series wheel loaders, which may include medium to large models such as ZW140, ZW180, ZW220, ZW250, ZW310, ZW330, ZW370-G, ZW550-G. This part number is a universal factory identification code. Due to the wide application of rubber hoses in the entire machine, involving different systems such as hydraulic oil pipes, fuel pipes, return pipes, or coolant pipes, it is necessary to conduct final verification based on the specific model of the equipment, system position (such as boom hydraulic oil pipes or engine fuel pipes), and old parts or maintenance manual illustrations before procurement to ensure that their inner diameter, length, joint specifications, and pressure resistance level are completely matched. This is a prerequisite for ensuring system sealing and reliable operation.

This rubber hose is a multi-layer composite structure industrial hose designed to withstand high pressure, pulses, and harsh working conditions. Its typical structure includes: the inner rubber layer directly contacts the medium, usually using oil resistant and corrosion-resistant nitrile rubber (NBR) or similar synthetic rubber; The reinforcement layer is a high-strength synthetic fiber weaving or steel wire winding layer, providing tensile strength and blast resistance; The outer adhesive layer has wear-resistant, weather resistant, and UV resistant properties. As an original component, its working pressure, burst pressure, temperature adaptability range (such as -40 ℃ to+120 ℃), and medium resistance performance (such as hydraulic oil, diesel, coolant) all strictly match the design requirements of the main engine. The joint form is usually a reusable crimping or permanent crimping type, ensuring a firm connection and reliable sealing. The surface of the hose may have color markings (such as black, red) or stripes to distinguish different systems.

The maintenance core of this rubber hose lies in regular inspection, correct installation, and preventive replacement. Regular inspection: It is recommended to visually inspect the appearance of the hose every 250 working hours or weekly, check for cracks, bulges, cuts, hardening, or abnormal expansion in the outer rubber layer, and inspect for leaks, rust, or looseness at the joints. When inspecting near the high-pressure system, a wooden board can be gently pressed against the hose to feel if there are any local bulges or pulse sensations caused by inner layer damage. Installation specifications: When replacing, original products must be used and the length of the hose must be appropriate. During installation, natural bending should be maintained to avoid twisting, excessive bending (bending radius should not be less than the manufacturer's specified value), or friction with sharp parts. If necessary, protective sleeves or brackets should be used for fixation. The connecting joint should be tightened according to the torque requirements, but excessive tightening should be avoided to prevent thread damage