7820300220 Original Loader Gearbox Bearing for Hitachi ZW550-G

Part number 7820300220 is the original gearbox bearing provided by Hitachi for the ZW550-G series large wheel loader. This bearing is the core rolling bearing that bears heavy loads in the gearbox or drive axle. Its universal model is usually dedicated to the ZW550-G model and may also be applicable to large loaders of the same series with the same transmission structure (such as ZW550-5, ZW550-6). As the core transmission component of the original factory, its inner and outer diameters, width, clearance, and the fitting tolerance requirements of the gearbox housing and shaft are extremely high

This product is a heavy-duty double (or multiple) row tapered roller bearing. The inner and outer rings are made of high-strength alloy steel, which has been carburized, quenched, and precision ground to present a silver gray metallic luster as shown in the picture. It has extremely high hardness and wear resistance. Internally, there are two or more rows of tapered rollers that make angular contact with the raceway and can simultaneously withstand significant combined radial and axial loads. Black high-performance rubber or fluororubber sealing rings are installed on both sides to form a long-lasting seal, effectively preventing gear oil leakage and external pollutant invasion. Its precision level is high, usually P5 or P6 level, with a working temperature range of -30 ℃ to+120 ℃, specially designed for high torque and high impact working conditions of large equipment such as ZW550-G.

Installation specifications: 1 Cleaning: Before installation, thoroughly clean the bearing seat holes, shaft necks, and new bearings with a lint free cloth and cleaning agent to ensure that there are no impurities. 2. Heating installation: It is recommended to evenly heat the bearing oil bath to 80-100 ℃, and then quickly and smoothly install it without knocking. 3. Clearance adjustment: After installation, it is necessary to accurately adjust the axial clearance of the bearing by adjusting the gasket or nut according to the manual, which is crucial for the bearing life. 4. Lubrication: Fill the raceway with a sufficient amount of specified heavy-duty gear oil or grease during installation.