Caterpillar original Excavator Fuel Injector 107-7773 for 3116 3114 Diesel Engine 200B 320B 322B 325B 446B E320B E322B Common Rail Diesel Injector original new injector

The Caterpillar CAT 3116 and 3114 mechanical diesel fuel injector with OE number 107-7773 is engineered as a direct OEM-type replacement for a wide range of heavy-duty Caterpillar equipment. It is designed to deliver precision fuel metering and fine atomization, supporting stable idle performance and strong load response across demanding working conditions. Manufactured to meet original equipment specifications, this injector provides reliable fitment, high compatibility, and consistent injection output, helping to restore engine power, reduce exhaust smoke, and improve overall fuel economy for long-term operation.

This injector is fully interchangeable with multiple cross reference numbers including 1077773, 107-7733, 1077733, 107-7732, 1077732, 0R-8682, 0R8682, 127-8216, 1278216, CA1077773, CA1077733, CA0R8682, and CA1278216, which simplifies inventory management for distributors and aftermarket resellers. It is widely applied in excavators such as the 320B, 322B, 325B, and M318, wheel loaders including the 924F, 928G, 938F, and 950F II, motor graders like the 120H and 135H, backhoe loaders, scrapers, track loaders, asphalt pavers, and compactors. It is also suitable for generator sets, trucks, marine auxiliary power units, and other industrial diesel machinery powered by CAT 3114 and 3114 engines.

For optimal service life, operators should use clean diesel fuel, replace fuel filters on time, drain the water separator regularly, and keep the fuel tank free from sludge, rust, and water contamination. Injectors should remain in sealed dry packaging until installation, the nozzle tip should not be touched, and engine oil should be monitored for fuel dilution. Common warning signs such as hard starting, rough idle, black or white smoke, engine knock, power loss, high fuel consumption, misfire, or fuel leakage around the injector body indicate the need for injector testing, cylinder cut-out testing, fuel pressure testing, compression testing, and verification of injector adjustment according to the service manual. When multiple injectors show uneven output, replacing the full set is recommended, and professional installation is strongly advised.