Caterpillar original Diesel Injector 320-0677 320-0690, Replacement for OE 320, 320-0680, suitable for CAT C4.4 C6.6 Engines, 320D 323D Excavator Construction Machinery original new injector

Built for Caterpillar C6-series industrial diesel platforms, the CAT 320-0677 Fuel Injector GP is an original high-pressure common rail diesel injector engineered for CAT C4.4, C6.4 and C6.6 engines. Validated for a wide range of Caterpillar machinery, it fits 320D, 320D GC and 323D L excavators, 914G and 914G2 wheel loaders, 420E backhoe loaders, D3K, D4K and D5K track type tractors, CP44 and CS44 vibratory compactors, generator sets and industrial power units. It supports construction, mining, agricultural and power generation operations worldwide, with cross-reference compatibility to standard aftermarket and reman part numbers.

Integrated into the engine’s high-pressure common rail system, the 320-0677 is regulated by the engine control module (ECM), which calculates exact fuel requirements using real-time data on engine speed, load, intake air pressure, fuel temperature and emission requirements. The injector activates in milliseconds to deliver precisely metered fuel through its multi-hole nozzle, atomizing diesel into microscopic particles for faster ignition, more complete combustion, lower fuel consumption, reduced particulate emissions and stable power output under heavy loads.

Produced to strict Caterpillar OEM manufacturing standards, the injector uses precision-machined heat-treated alloy steel components and advanced anti-corrosion surface treatment, with a high-pressure design rated for 1,600–2,000 bar common rail pressures. Its heavy-duty construction delivers extended service life in extreme temperatures and harsh work environments, maintaining consistent spray patterns and stable fuel delivery across long operating cycles to support reliable engine performance.