Caterpillar original Caterpillar original Caterpillar 0R-8477 Mechanical Fuel Injector 127-8211 7E-8728 for 3114 3116 Engine E320B E325B E320D Excavator Diesel Parts new original new injector

The Caterpillar 0R-8477 / 127-8211 diesel fuel injector is engineered for CAT 3114, 3116, 3126, and 3126B diesel engines used in excavators, loaders, generator sets, trucks, and marine auxiliary power units. The injector meters, pressurizes, and atomizes diesel fuel into the combustion chamber, supporting clean combustion, stable power output, and reduced exhaust smoke. It is a direct-fit replacement for the original CAT injector group, with cross references including 0R-8477, 0R8477, 127-8211, 1278211, CA0R8477, CA1278211, 9Y-3113, 7E-8728, and 127-8205.

Built with heavy-duty construction and precision-machined internal components, the 0R-8477 reman injector group delivers stable atomization, accurate fuel metering, and long service life under demanding industrial conditions. The unit is compatible with CAT E320B and E325B excavators, medium-duty loaders, diesel generator sets, and medium-duty trucks and buses. Condition options include remanufactured, replacement, aftermarket, and new aftermarket, with sales units available as a single piece, 4 pieces, 6 pieces, or a full engine set. Injectors with different flow rates or remanufacturing standards must not be mixed, and replacement as a matched set is recommended when required.

Before installation, verify the OE number, engine model, engine serial number, and arrangement number to confirm correct fitment. Clean the injector bore, replace all sealing components, flush the fuel system if contamination is present, follow Caterpillar service manual procedures, apply official torque values, and perform bench testing or calibration where applicable. After installation, inspect for leakage, idle quality, exhaust smoke, power response, and fault codes. For ongoing reliability, use clean diesel fuel, replace fuel filters at the recommended interval, drain the water separator regularly, test injector flow balance during engine overhaul, and avoid mixing old and new injectors with different spray characteristics.