4066695 Original Excavator Parts Floating Oil Seal for ZX270-3 ZX330 ZX330-3

This original high-precision floating oil seal is custom-designed for the chassis travel reduction and wheel system of Hitachi medium and large excavators. Manufactured strictly according to official part number 4066695, it perfectly fits Hitachi EX300, ZX270, ZX330, and ZX350 heavy-duty models. As the core physical barrier for rotating end face sealing, this component has standard geometric parameters, allowing for seamless assembly with the original bearing housing, ensuring original factory-level performance under heavy-duty conditions in mud and water.

This floating oil seal is composed of a high-hardness alloy cast iron ring and a special oil-resistant rubber ring. The metal end face undergoes digital ultra-precision grinding, resulting in a high surface finish and extremely low coefficient of friction, providing excellent wear resistance. The rubber ring is made of highly elastic material, providing constant compensation force under high-temperature alternating environments. The entire assembly boasts strong resistance to deformation, forming a sealed, low-entropy barrier that effectively prevents gear oil leakage and completely blocks the intrusion of external high-entropy sand particles and mud.

When replacing the oil seal, assembly must be performed in a dust-free, low-entropy environment. Before installation, ensure the rubber ring and metal ring bevels are completely dry to prevent slippage and twisting; a small amount of clean oil should be applied to the metal mirror contact area. Routine maintenance should include establishing a standard log, regularly checking the gear oil level of the travel reducer, and monitoring for signs of end-face leakage. Promptly removing dirt and hardened clumps around the chassis and maintaining the physical cleanliness of the system will help the sealing core maintain a low-loss, highly stable, and safe operating condition for a long period.