original 171-9704 Fuel Injector Common Rail Diesel Injector Nozzle Assembly for 3126 3126B 3126E Engine 120H Excavator Truck Parts 1719704 original new injector

Engineered for demanding heavy-duty operations, the 171-9704 Fuel Injector is a precision-built HEUI (Hydraulic Electronic Unit Injection) component designed as a direct OEM replacement for 3126, 3126B, and 3126E diesel engines. This injector assembly meets original equipment specifications and cross-references to alternative part numbers including 1719704, 0R-8686, 0R8686, 10R-0955, and 10R0955, offering fleet operators, engine rebuilders, and industrial distributors a dependable interchange solution for global service applications.

Manufactured with precision-machined components and hardened internal parts, the 171-9704 injector delivers accurate fuel metering, superior atomization, and high-pressure delivery for optimized combustion efficiency. Corrosion-resistant materials ensure extended operational life under harsh working conditions, while advanced nozzle technology supports reduced fuel consumption, enhanced power output, lower exhaust emissions, and improved cold-start performance. Its OEM-conforming design allows direct bolt-in replacement without engine modification, minimizing downtime during scheduled maintenance or unplanned overhauls across construction, marine, and power generation fleets.

Typical applications include excavators, wheel loaders, motor graders, commercial trucks, buses, generator sets, marine auxiliary engines, industrial compressors, pumps, and agricultural power units. Installation requires disconnecting battery power, removing the valve cover, replacing seals and O-rings, torquing to specification, and priming the fuel system. Recommended diagnostics cover hard starting, black or white smoke, low power, rough idle, and engine knock—supporting reliable long-term performance for 3126 series diesel platforms worldwide.