Caterpillar original Diesel Fuel Injector 320-0677 Assembly for C4.4 C6.6 Engine 320D 323D Excavator Replacement for OEM 10R-7671 2645A746 320-0680 320-0690 Spare original new injector

The Caterpillar CAT C6.6 Fuel Injector 320-0677 is engineered as a direct OEM replacement for Caterpillar C4.4, C6.4, and C6.6 turbocharged diesel engines operating within electronic high-pressure common rail fuel systems. Built to original Caterpillar fuel system specifications, this injector delivers precise fuel metering under all operating conditions, with multi-hole nozzle geometry producing an optimized spray pattern for efficient combustion. Common rail pressure capability exceeding 1,600–2,000 bar ensures stable injection performance across varying load demands encountered in excavators, wheel loaders, track type tractors, backhoe loaders, vibratory compactors, and industrial generator sets.

Manufactured from heat-treated alloy steel and treated with advanced anti-corrosion surface coatings, the 320-0677 injector is designed for extended service life in mining, construction, agricultural, and power generation environments. It is fully interchangeable with authorized cross reference numbers including 10R-7671, 292-3778, 306-9377, 2645A737, 2645A738, and 2645A746, covering 320D, 323D L, 914G, 914G2, 420E, D3K, D4K, and D5K equipment platforms. The component is available in OEM, Genuine CAT Reman, and high-quality aftermarket versions to support diverse global aftermarket requirements across North America, South America, Europe, the Middle East, Africa, and Asia-Pacific.

Routine maintenance of the 320-0677 injector requires the use of OEM fuel filters, clean diesel fuel free from water contamination, periodic return flow testing, and inspection of fuel rail pressure values. Installation should follow Caterpillar torque specifications with new sealing washers, proper fuel system bleeding, injector code programming where required, and post-installation leakage verification to ensure consistent engine performance and fuel economy.