Caterpillar original  10R-7939 Common Rail Fuel Injector for C6.4 C6.6 C4.4 1104D-E44TA D6N Diesel Excavator Engine Parts original new injector

The CAT C6 Series common rail fuel injector 10R-7939 is engineered for heavy-duty diesel applications requiring precise fuel metering and dependable high-pressure performance. Compatible with CAT C6.4, CAT C6.6, CAT C6.4 ACERT, CAT C6.6 ACERT, Perkins 1106D-E66TA, and Perkins 1106D-E70TA engines, this injector supports operational pressures exceeding 1800 bar, with a maximum capability of up to 2000 bar. The unit is constructed from hardened alloy steel and manufactured to micron-level machining tolerances, ensuring consistent spray atomization and accurate fuel delivery across demanding load conditions.

This injector serves as a direct OEM replacement for an extensive range of part numbers including 320-0688, 321-1080, 293-9580, 289-7500, 282-0480, 276-8280, 266-4434, 257-2500, 2645A742, 2645A753, 2645A747, 2645A708, 2645A704, 2645A703, and 2645A473, enabling broad cross-reference coverage for fleet operators and service workshops. It fits CAT D6N, D6N XL, D6N LGP, 930H, 928HZ, 953D, and IT28G equipment, alongside industrial power units and generator sets operating in construction, mining, power generation, agriculture, and marine environments.

Each injector is individually tested for injection quantity, return flow, leakage, response time, spray pattern, and solenoid resistance, ensuring immediate readiness for installation. Protective surface treatments enhance corrosion resistance in harsh operating conditions, while the precision multi-hole nozzle technology contributes to improved combustion efficiency, reduced fuel consumption, lower exhaust emissions, and extended engine service life. Installation should always include a new copper washer, inspection of the injector bore, and proper fuel system bleeding, with injector coding performed when required by the engine management system.