This oil pump assembly is engineered to meet standardized specifications, delivering consistent oil pressure to support stable operation of excavator powertrain systems in high-intensity construction and mining scenarios. Manufactured with high-strength cast alloy housing, it offers exceptional structural durability to withstand prolonged vibration and temperature fluctuations during heavy-duty excavation work. The precision-machined internal gears ensure smooth fluid delivery, reducing wear of core engine components and extending the service life of the entire powertrain. The sealing structure is designed to physical blocking of external debris intrusion, maintaining oil flow integrity and avoiding pressure instability caused by impurity interference. Each unit undergoes strict dimensional and pressure testing before leaving the factory, ensuring seamless installation and matching the performance parameters of the original equipment, eliminating the need for secondary modification during replacement.