Product Overview This hydraulic main pump (part numbers 153-8181, 153-8179, 10R-0529) is the primary hydraulic power unit specifically engineered for the E5110B excavator hydraulic system. It delivers high-pressure hydraulic oil to drive the boom, arm, bucket, travel, and swing assemblies. Featuring a variable piston structure, precise flow control, wear-resistant alloy materials, and precision machining, this pump offers direct replacement installation and stable output