YNF16870 9742464 Piston HPV050 Hydraulic Pump Piston for Hitachi EX100-5 EX120-5

The YNF16870 piston, engineered to replace OEM 9742464, is a critical component of the HPV050 hydraulic pump found in Hitachi EX100-5 and EX120-5 excavators. Serving as one of the main working elements inside the pump’s rotating group, the piston converts hydraulic pressure into mechanical motion, allowing the pump to deliver consistent flow and high output efficiency.

Manufactured from heat-treated alloy steel and processed with precision CNC grinding, the piston provides excellent hardness, smooth surface finish, and stable movement within the cylinder block. Its high durability helps reduce internal leakage, maintain pressure levels, and improve overall hydraulic performance under heavy-duty construction conditions.

This piston is widely used by hydraulic rebuild shops, aftermarket distributors, and excavator maintenance facilities. Replacing worn pistons restores pump efficiency, increases hydraulic responsiveness, and reduces operational downtime, ensuring stable machine productivity.