Komatsu 708-2L-06470 Hydraulic Pump Cylinder Block

The 708-2L-06470 cylinder block is a critical rotating group component designed for the Komatsu HPV95 variable displacement axial piston pump. It houses nine pistons in a precision-bored barrel, converting mechanical shaft rotation into hydraulic flow through controlled displacement variation. Manufactured from high-strength alloy steel with case-hardened running surfaces, the block maintains dimensional stability under peak pressures of 34.3 MPa. The component interfaces directly with the valve plate and piston shoes, requiring exact flatness and surface finish to minimize internal leakage and maximize volumetric efficiency. This part serves as a direct replacement for OEM numbers 708-2L-06470, 708-2L-06480, 708-2L-06360, and 708-2L-04040 across HPV95, HPV95H, and HPV95A pump variants. Compatibility spans Komatsu PC200-6, PC200-7, PC200-8, PC210-7, PC210-8, PC220-6, PC220-7, PC220-8, PC270-8, PC120-6, and PC130-7 excavators equipped with the HPV95 main pump. The cylinder block is engineered to match the 95 cc/rev per section displacement and 16-tooth (PC200-7) or 14-tooth (PC200-8) drive spline configurations. Installation requires verification of pump nameplate and control valve type (PC/LS/EPC) to ensure correct barrel orientation and port timing alignment.