4206070450 Loader Swing Bearing for ZW370-5A

The original swing bearing 4206070450 is designed specifically for the Hitachi ZW370-5A large wheel loader and is a key connecting component in its steering or drive axle transmission system, commonly known as the "cross shaft". This universal number is the unique identifier for its genuine parts, ensuring that it matches perfectly with the installation holes, fitting dimensions, and torque loads of the host universal joint fork and transmission shaft. This bearing is also commonly used for the Komatsu WA380 series and other loaders of the same tonnage that use similar transmission structures, but the part number and specific host model must be verified when ordering to ensure accurate replacement.

This product is a cross axis universal joint assembly, forged from high-strength alloy structural steel (such as 20CrMnTi) and treated with carburizing and quenching. The surface is a dull metallic gray, with extremely high core toughness and surface hardness (usually HRC 58-62). Its core is a precision machined cross shaft body, with needle roller bearings installed on the four shaft necks to significantly reduce friction and wear; The end of the shaft neck is fixed by a snap spring or pressure plate to prevent the outer ring of the bearing from falling off. The positioning pin that runs through the middle further enhances the stability and shear resistance of the overall structure. This design allows the transmission shaft to efficiently transmit torque at large angles, while compensating for the relative swing between the axle and the frame. It is the core mechanical component that ensures smooth and reliable power transmission under complex working conditions of ZW370-5A.

It is recommended to add the specified type of lithium base pressure grease through the grease fitting every 250 hours of work until the old grease is squeezed out from the sealing ring, ensuring that all bearing needles are fully lubricated. Regularly check the bearings for abnormal clearance (radial shaking), abnormal noise, obvious wear, dents or rust on the cross shaft neck, and whether the retaining spring is loose. If excessive wear or looseness is found, the original assembly of 4206070450 should be replaced immediately, and it is strictly prohibited to replace only a single component. When disassembling and reassembling, it is necessary to thoroughly clean all mating surfaces, use a torque wrench to cross tighten the connecting bolts according to the specified torque, and ensure that the transmission shaft is well aligned to avoid generating additional bending moments and shorten the bearing life.