4409122PY Original Excavator Bushing for ZH200LC-6

Part number 4409122PY is the original composite liner provided by Hitachi for the ZH200LC-6 series hydraulic excavator. According to the naming convention of the model, the "ZH" model may be a specific region or a modified model, and its core platform is similar to the ZX200-6 series. Therefore, this bushing has extremely high universality and is usually suitable for 20-22 ton same platform models such as ZX200-6, ZX210-6, ZX220-6, etc. It is used for hinge points, pin connections, or buffering parts of working devices (boom, stick, bucket) or chassis walking mechanisms. Its universal number (substitute part number) includes similar models such as 4409121PY, 4409123PY, etc. It is strictly prohibited to use non-standard spare parts to avoid abnormal wear of connection points, increased clearance, or abnormal noise.

This product is a Hitachi pure metal rubber composite liner, with a structure identical to the picture: the outer layer is a high-strength alloy steel sleeve (surface galvanized or phosphated to prevent rust, with a silver gray metallic luster), and the inner layer is pressed with high-performance rubber elastomer (black in color), forming a "hard soft hard" sandwich structure. This design allows the liner to provide stable support through interference fit between the metal shell and structural components, while also utilizing the internal rubber layer to absorb and buffer impacts and vibrations in all directions, while allowing for slight deflection and displacement. Its working temperature range is usually -40 ℃ to+80 ℃, and it can withstand high radial loads and alternating stresses. Hitachi genuine bushings have significant advantages in adhesive strength, oil resistance and aging resistance, ensuring that rubber and metal are not separated and have a long service life.

Replacement cycle: It is recommended to check every 3000-5000 working hours, or replace it promptly when there is obvious looseness or abnormal noise at the hinge point. Daily inspection: When lubricating and maintaining each hinge point every 250 working hours, check whether there is abnormal compression, rubber cracking, permanent deformation, or excessive clearance between the bushing and the pin shaft. It is strictly prohibited to disassemble or assemble without using specialized tools for the sake of convenience; Avoid contact between rubber parts and ozone, oil stains, and sharp objects during storage; During installation, it is essential to ensure that the fit tolerances between the liner and the hole, as well as between the pin shaft and the liner, comply with the manual requirements. It is strongly recommended to use Hitachi original bushings, as there may be issues with poor rubber material, insufficient metal strength, and weak bonding of auxiliary components, which can lead to serious consequences such as buffering failure, early wear, and even pin shaft fracture.