original 577-7633 387-9441 328-2587 387-9435 573-4231 Common Rail Injector 3879435 5734231 for C7 C9 Diesel E336D Excavator new injector original new injector

Engineered as an OE-type replacement for the C9 diesel platform, this fuel injector is calibrated to deliver precise fuel metering and stable atomization across a wide range of heavy-duty working conditions. Built with heavy-duty internal components and matched to C9 injection system parameters, the unit supports reliable cold starting, smooth idle quality, consistent acceleration, and stable load response. The injector integrates directly into existing fuel rail and harness connections, allowing straightforward installation during scheduled engine service, rebuild programs, or fleet maintenance operations on construction and industrial sites.

The injector is cross-referenced against multiple authorized part numbers, making it suitable for distributors, rebuild workshops, and fleet operators managing mixed C9-powered equipment inventories. It is designed to help restore original engine performance in equipment including 330D, 336D, 340D2 excavators, 140M and 160M motor graders, 627G and 637G wheel tractor scrapers, 814F II, 815F II, 816F II, 973C track loader, MD5075 and MD5075C drills, TH31-C9P petroleum package, and selected forestry machines. Proper matching by serial number and engine code is recommended to ensure full compatibility with the target C9 application.

Correct installation and ongoing maintenance are essential to maximize injector service life. Operators should replace fuel filters at the recommended interval, supply clean diesel from reliable sources, drain the water separator regularly, and inspect fuel lines for leaks, restrictions, and air entry. Hydraulic oil condition should be monitored where injector actuation depends on oil pressure, and diagnostic scanning should be used to read ECM fault codes when symptoms such as hard starting, rough idle, misfire, excessive smoke, fuel knock, or reduced power are observed. Professional bench testing of removed injectors is advised to verify flow, leakage, and response performance before reinstallation.