Caterpillar original Common Rail Fuel Injector 0R-0906 7E-9983, Cross Reference 7E-6408 for CAT 3500A 3508 3512 3516 Engine, Excavator 777B 785 789, Replacement for OEM 0R-3051 original new injector

For procurement teams servicing Caterpillar heavy-duty engines, the 0R-0906 fuel injector—also searched as 0R0906—is an official Cat Reman fuel injection component. It is classified within Reman Fuel Nozzles & Injectors and is intended for diesel-engine fuel systems rather than as an unverified universal replacement. The first character is zero, although OR-0906 may appear as a common search variation.

Caterpillar parts data links 0R-0906 to two important reference numbers: 7C-4184, listed as a Caterpillar fuel injector, and 7C-9580, an earlier assembly now identified as discontinued. In both cases, 0R-0906 is presented as the available Cat Reman option. Buyers should not automatically assume that other 3500-series injectors are interchangeable; supersession status alone does not remove the need to confirm the original part number and service data.

The target application is the Caterpillar 3512A diesel engine platform used in demanding industrial, generator, marine, and heavy-duty configurations. Because 3500-family arrangements differ by production period, cylinder-head configuration, fuel-system generation, and engine rating, accurate identification requires the engine serial number, arrangement number, removed injector number, and current Caterpillar parts documentation. Catalog dimensions are approximately 312.4 mm long, 121.9 mm high, and 121.9 mm wide, suitable for identification and logistics planning rather than installation-clearance checks.