Hitachi Cylinder Seal Kit-YA00001399-Fits John Deere Excavator 270CLC 4639936 Hitachi Cylinder Seal Kit-YA00001399-Fits John Deere Excavator 270CLC 4639936Hitachi – Cylinder Seal Kit-YA00001399. Fits John Deere Excavator 270CLC, part # 4639936.