Caterpillar 4P-9077 Fuel Injector Assembly

The Caterpillar 4P-9077 is a mechanical unit injector (MUI) designed for the 3500A series diesel engines. It features single-port metering and is engineered for high-pressure fuel delivery in heavy-duty industrial, marine, and power generation applications. The injector assembly includes the nozzle, plunger, and barrel components calibrated to OEM specifications for accurate fuel injection timing and quantity. Cross-reference part numbers include 0R-2925, 7E-3383, 9Y-4544, 0R-2837, 20R-5804, 7E-6408, 7C-4184, 6L-4355, 0R-8338, 10R-1252, 224-9090, 111-3718, 4P-9075, and 4P-9076. Compatible with Caterpillar 3508, 3512, 3516, and 3512A engines used in excavators, wheel loaders, off-highway trucks, generator sets, and marine propulsion systems. Manufactured to meet ISO and OEM quality standards for reliable operation under severe duty cycles.