Caterpillar 3879434 Fuel Injector Assembly

The Caterpillar 3879434 is a HEUI (Hydraulic Electronic Unit Injector) designed for Caterpillar C9 ACERT diesel engines. It utilizes engine hydraulic oil pressure to generate high fuel injection pressure, controlled electronically via a solenoid valve with trim code CD. The injector body is constructed from heat-treated alloy steel with a corrosion-resistant coating to withstand heavy-duty operating cycles. This injector assembly carries Caterpillar remanufactured part number 10R7221 and cross-references OEM numbers 328-2573, 267-9734, and 293-4071. Primary applications include Caterpillar 330D and 336D hydraulic excavators, D6R, D6T, and D7R track-type tractors, and 160M motor graders. Net weight is 1.35 kg with external dimensions of 280 x 100 x 100 mm. Designed for a minimum of 1,000,000 injection cycles under heavy-duty conditions.