4200320030 Loader Bearing for ZW370-5A

The original bearing (part number 4200320030) is a genuine transmission component of the Hitachi ZW370-5A wheel loader, mainly used for key rotating parts such as the gearbox, drive axle, or differential of this model. ZW370-5A is a 37 ton wheel loader from Hitachi Construction Machinery, typically equipped with a Cummins QSX15 engine (rated power of approximately 255 kW) and a hydraulic torque converter gearbox. The universal number 4200320030 of this bearing is its unique identifier in Hitachi's original accessory system, ensuring complete matching with the host shaft diameter, seat hole size, and operating load. When placing an order, it is necessary to provide the complete model and serial number of the loader for verification to avoid mismatches.

This product belongs to heavy-duty rolling bearings for construction machinery, which may be single row tapered roller bearings or cylindrical roller bearings. It is made of high carbon chromium bearing steel (such as GCr15) material, which has undergone quenching, tempering, and precision grinding processing, and has high load-bearing capacity, impact resistance, wear resistance, and long life characteristics. Its design needs to meet the long-term reliable operation of the loader in environments with heavy loads, vibrations, high dust, and temperature differences, such as for use in transmission shafts, gearboxes, or wheel hubs. The radial clearance, precision level (such as P5/P6), and lubrication structure of the original bearings have undergone strict matching tests to ensure stable rotation and low noise under high speed and high load conditions.

It is recommended to check the bearings for any signs of abnormal noise, overheating, vibration, or excessive clearance every 500 hours of work or every quarter. When replacing, thoroughly clean the installation area, remove old lubricating grease and impurities, and use original 4200320030 pieces. Special tools should be used during installation to avoid direct tapping, and adjustments should be made according to the pre tightening force or clearance specified in the maintenance manual. Lithium based grease (such as NLGI grade 2) should be regularly added in daily life to maintain good sealing and prevent water and dust from entering. When storing, it should be placed in a cool and dry place to avoid moisture and corrosion. Regular maintenance can effectively prevent early failure of bearings, transmission system failures, and equipment downtime losses.