Caterpillar original Common Rail Diesel Fuel Injector 20R-8846 557-7637 20R-8069 557-7634 Replacement for OEM Parts, for C9 Engine Excavator Truck original new injector

Engineered for demanding heavy-duty diesel applications, the Caterpillar 20R-8069 fuel injector—also referenced as 20R8069—is an original-standard HEUI injector assembly designed for CAT C7 and C9 diesel engines. Listed by Caterpillar as "INJECTOR G-F," this unit delivers precise fuel metering, accurate injection control, stable combustion, and dependable engine output across construction machinery, commercial trucks, generator sets, marine power units, and mining equipment. The 20R-8846 Cat Reman injector is also identified as an available factory remanufactured alternative.
The CAT C7/C9 HEUI injection system combines hydraulic actuation with electronic control. Pressurized engine lubrication oil—raised from approximately 6 MPa (870 psi) to 28 MPa (4,050 psi)—drives the injector plunger, multiplying hydraulic force to generate high fuel injection pressure, while the ECM precisely governs injection timing and duration. Installed in the cylinder head injector bore, the 20R-8069 operates as a core component of the diesel fuel injection system, supporting consistent performance under continuous industrial workloads.
This injector crosses to multiple market reference numbers, including 20R-8057, 295-1409, 387-9429, 328-2580, 10R-9003, 20R-8059, 20R-8071, 243-4503, 295-9166, and 20R-8067. Typical equipment applications include excavators, wheel loaders, bulldozers, motor graders, articulated trucks, buses, highway trucks, agricultural machinery, and industrial power units. Supply options include original, genuine, remanufactured, or replacement versions with original, neutral, or customized export packing, typically with a minimum order of one piece. Before ordering, verify fitment via engine serial number, arrangement number, machine model, and old injector tag.