Komatsu 723-46-18300 Hydraulic Valve Case Sub Assembly

The 723-46-18300 hydraulic valve case sub assembly serves as the main control valve housing for Komatsu hydraulic excavators. This precision-machined component contains the spool valves and control passages that direct hydraulic fluid to cylinders and motors for boom, arm, bucket, and swing functions. Constructed from high-strength cast iron with hardened internal surfaces to withstand continuous high-pressure hydraulic cycles. The assembly includes integrated mounting flanges, port interfaces, and pilot control passages compatible with Komatsu PC200 and PC220 series excavators equipped with load-sensing hydraulic systems. Direct OEM replacement for part numbers 723-46-18300 and 7234618300. Cross-referenced with 723-47-23203 valve assembly variants. Designed for 34.3 MPa (5,000 psi) system pressure rating with SAE flange port connections.