original 173-4059 Common Rail Diesel Fuel Injector for 3412 Tractor 3126B 3126E Engine  original new injector

Engineered specifically for the 3126, 3126B, and 3126E 7.2L diesel platforms, injector 173-4059 1734059 delivers a precise OE-level fit for inline 6-cylinder HEUI systems with 110 mm bore and 127 mm stroke. The injector is built to support stable combustion through accurate fuel metering and efficient spray atomization, helping reduce smoke output and maintain consistent engine performance under medium-duty and industrial load conditions. Broad cross-reference coverage—including 0R9349, EX639349, 1260499, 1317150, 1739267, 1739268, 1961401, 2225967, 1643355, 10R8999, 10R9238, and 2184109—allows distributors, reman suppliers, and fleet operators to consolidate inventory around a single validated part number for the 3126 engine family.

Suitable for medium-duty trucks, buses, RVs, motorhomes, construction machinery, industrial power units, marine engines, generator sets, agricultural diesel equipment, and mining support equipment, this injector addresses common 3126 7.2L service demands. Recommended diagnostic procedures include fuel pressure testing, oil pressure testing for HEUI actuation, ECM fault code reading, injector electrical connector inspection, and cylinder contribution testing. Confirmed defective units—often linked to hard starting, rough idle, engine misfire, white or black smoke, low power, high fuel consumption, or engine knock—should be replaced in matched sets when engine hours are high or multiple injectors show wear.

Proper maintenance extends injector service life: replace fuel filters at scheduled intervals, use clean diesel fuel, drain the water separator regularly, maintain correct engine oil levels, flush the fuel system after contamination, and inspect for leaks at every service interval. Supplied in professional industrial packaging with quality inspection options and global sourcing support, injector 173-4059 1734059 serves as a reliable engine-specific replacement for B2B buyers serving 3126 series truck, bus, marine, construction, and generator applications.