The Caterpiillar Fuel Injector Actuating Pump 204-4945 is a premium OEM-grade hydraulic component exclusively engineered for Cat C9 diesel engines, serving as the core power unit that delivers precise high-pressure fuel supply to engine injectors. It adopts a robust gear-driven structure and integrated precision pressure-regulating valves, ensuring stable and consistent fuel flow even under extreme variable loads in construction, mining, and on-highway truck applications.Constructed from heat-treated high-strength cast iron and wear-resistant alloy steel parts, this pump exhibits excellent resistance to vibration, high-temperature corrosion, and mechanical wear, effectively extending service intervals and reducing maintenance downtime. It seamlessly integrates with the C9’s electronic control system, optimizing fuel delivery timing and pressure to enhance combustion efficiency, unleash the engine’s 410-hp maximum power output, improve fuel economy, and meet strict global emission standards. Backed by Cat’s strict quality certification, it is the ideal choice for C9 engine maintenance and performance upgrades.