Hitachi 4350347 Floating Seal Assembly

The 4350347 floating seal group (duo cone seal) is engineered for heavy-duty excavator travel motor gearboxes and final drives. It consists of two precision-ground metal seal rings (100CR6 steel, 58-65 HRC) mounted face-to-face with conical sealing faces, centered by elastomeric toroids (NBR 60-65 Shore A or silicone). This design retains lubricating oil while excluding abrasives, water, and dirt in severe undercarriage environments. The seal is a direct replacement for Hitachi part number 4350347 and cross-references to Caterpillar 255-2272 / 213-4737, John Deere 4350347, and JCB applications. It fits a wide range of 45-65 metric ton class hydraulic excavators including Hitachi ZX450-3, ZX470H-3, ZX500LC, ZX520LCH-3, ZX600, ZX650H, ZX650LC-3, EX550, EX450MT-5, EX600H-3/5 series, John Deere 330LC, 450LC, 550LC, 600C, 650DLC, 670GLC, 750, 800C, 850DLC, 870GLC, 992ELC, and JCB JS290, JS370. Rated service life is 3000-5000 operating hours under normal conditions.