4433671 Construction Machinery Parts Excavator Bushing

Hitachi original liner, with part number 4433671, is a genuine original accessory designed specifically for Hitachi brand excavators. This liner is widely used in multiple Hitachi hydraulic excavator models, mainly covering small to large equipment. Specifically, it includes the ZX series ZX55、ZX60、ZX70、ZX110、ZX120、ZX130H、ZX135US、ZX160LC-3、ZX180LC-3、ZX200-3G、ZX210H-3G、ZX240-3G、ZX250H-3G、ZX260LCH-3G、ZX330-3G、ZX360H-3G Waiting for the model. It is also compatible with classic EX series models such as EX120, EX150, EX200, EX210, EX220, EX240, EX250, EX260, EX300, etc.
 

The original liner 4433671 usually uses high-strength alloy steel as the backing, and the inner layer is composite with copper based or polymer materials with excellent wear resistance (such as polyoxymethylene POM), which can effectively reduce direct friction and wear between metals under high load and impact conditions. Its design is precise, with strict dimensional tolerances to ensure a tight fit with the pin shaft and hole seat, preventing abnormal shaking and impact caused by excessive clearance. The surface of the liner may have oil storage pits or lubrication grooves, which facilitate the storage and distribution of lubricating grease and form a long-lasting oil film. Some models also undergo special surface treatments (such as phosphating or coating) to enhance corrosion resistance.

To ensure the long-term operation of the lining, it is necessary to follow a regular lubrication and inspection system. It is recommended to inject a sufficient amount of specified type of lubricating grease into the liner through the grease nipple every 50 hours of operation or every week until the old grease is squeezed out from the edge of the sealing ring to remove impurities and form a new oil film. A comprehensive inspection should be conducted every 500 hours of operation or once a month to observe whether there is any abnormal clearance, noise or oil leakage at the fit between the bushing and the pin shaft. Check if the sealing ring is intact to prevent dust and moisture from entering. In harsh working conditions such as high dust and water immersion, it is necessary to shorten the lubrication and inspection cycle.