4287248 Original Excavator Parts Arm Pipe Sleeve for ZX120-3 ZX120-5B ZX160 ZX200 ZX200-5G ZX200-5B

This original specification arm tube sleeve (also known as boom/stick pipe protection sleeve, pipe clamp liner) is specially customized for the front-end hydraulic system of Hitachi's medium and large excavators. The product strictly follows Hitachi's official part number 4287248 for high-precision mass production, perfectly adapting to Hitachi's main crawler excavator series such as ZX200-3, ZX240-3, ZX330-3, and the latest ZX-5A, ZX-5G. This component is mainly deployed inside the hydraulic high-pressure oil pipe fixing fixture of the boom and arm, providing precise physical positioning and shock absorption protection. The standardized geometric dimensions ensure a perfect fit with the original pipe clamp steel strip, achieving seamless replacement.
 

The arm tube sleeve is made of high-density, special oil resistant synthetic modified rubber or high-performance polyurethane elastomer material, which has undergone digital injection molding and high-temperature vulcanization processes. The product has excellent anti fatigue and deformation recovery capabilities, moderate hardness, and can provide stable clamping force while efficiently absorbing the severe resonance and high-frequency micro motion generated by hydraulic pipelines under high-pressure alternating impact. Special anti-aging and anti ultraviolet additives are added inside the materials, which have excellent oil resistance, high temperature resistance and ozone aging resistance properties. Even after long-term exposure to the harsh outdoor sun exposure and high entropy dust environment of the mine, the physical structure can remain absolutely stable.
 

As an important protective barrier for the front-end hydraulic pipeline, this pipe sleeve needs to be included in regular inspection items during later maintenance. During daily maintenance, it is important to focus on checking whether the pipe sleeve has local thinning, cracking, hardening, or brittleness caused by long-term high-frequency friction. When replacing or reinstalling, the pipe clamp bolts must be tightened strictly according to the original factory torque standard to avoid excessive compression and deformation of the pipe sleeve caused by over tightening, or pipe movement caused by over loosening. Keep the pipe sleeve and surrounding area clean, promptly remove high entropy sand and gravel particles in the gaps, prevent foreign objects from evolving into abrasives during resonance, and effectively eliminate the risk of outer wall wear and leakage of hydraulic steel pipes.