Hitachi excavator accessory 4443878 shaft sleeve; Big arm base shaft sleeve/large and small arm connection shaft sleeve

This product is a wear-resistant shaft sleeve (liner) specifically designed for excavator working devices, mainly used for key pivot parts such as the base of the boom head and the connecting pin shaft of the large and small arms. Using high-quality steel precision machining and heat treatment, it has high hardness, high wear resistance, and good impact resistance, which can effectively reduce friction and wear between the pin shaft and the seat hole, ensure smooth and accurate operation of the working device, and extend the service life of the whole machine. Suitable for daily maintenance, major repairs, and preventive replacement use.