Product Overview This hydraulic main pump, with part numbers 369-9655 and 369-9656, is the primary hydraulic power unit specially engineered for the hydraulic system of E374D and 390F L excavators. It supplies high-pressure hydraulic oil to drive the boom, arm, bucket, travel, and swing assemblies. The pump adopts a variable piston structure, precise flow control, wear-resistant alloy materials, and precision machining. It is designed for direct replacement installation and