This oil pump assembly is manufactured to factory standard specifications, delivering consistent performance for excavator operation in construction and mining scenarios. It is engineered with high-grade cast metal components, offering excellent structural durability and heat resistance to withstand prolonged high-load engine operation. The precision-machined internal components ensure stable oil delivery pressure, effectively reducing abnormal wear of engine moving parts during continuous work cycles. The precision-molded sealing components provide reliable physical interception of external debris, maintaining flow integrity of lubrication system and avoiding excessive pressure loss during operation. All dimensions and mounting interfaces are fully aligned with standardized specifications for direct replacement, eliminating extra modification steps during installation, effectively reducing equipment downtime in harsh working environments.