4410050 Original Excavator Hydraulic Pump Repair Kits Roller Bearing for ZX200

Hitachi original excavator roller bearings (universal part number: 4410050) are key load-bearing and transmission components in excavator slewing mechanisms, walking mechanisms, or working devices. This original spare part is widely used in multiple series of Hitachi excavator models, including but not limited to ZX55、ZX60、ZX70、ZX120、ZX200、ZX210、ZX240、ZX250、ZX270、ZX330、ZX360、ZX450、ZX470、ZX650、ZX670、ZX850、ZX870 Waiting for ZX series models, and EX120、EX200、EX210、EX220、EX240、EX250、EX260、EX300、EX350、EX450、EX470、EX870、EX1200 Waiting for EX series models.

This roller bearing is the core component of excavators that can withstand huge loads and impacts. Its design aims to transform sliding friction into rolling friction, significantly reducing motion resistance. As an original component, it is made of high-quality bearing steel (such as GCr15) and processed through precision forging, turning, heat treatment (quenching and tempering), and grinding. It has extremely high hardness, wear resistance, and fatigue strength. Roller bearings are usually cylindrical or conical in shape, in line contact with the inner and outer raceway. Compared to point contact ball bearings, they can withstand larger radial loads and certain axial loads, especially suitable for the severe vibration, impact, and unbalanced load conditions that excavators experience during operation.

The maintenance core of roller bearings lies in regular lubrication, cleanliness maintenance, and condition monitoring to prevent abnormal wear and early failure. Firstly, it is necessary to strictly follow the cycle specified in the equipment maintenance manual (usually every 250-500 hours of operation) and use designated high-temperature, high adhesion lubricating grease for lubrication. When adding, squeeze out the old grease from the sealing lip until fresh grease overflows to ensure complete filling inside.