Caterpillar original Diesel Common Rail Injector 577-7633 for Caterpillar C7 C9 Engine, Replacement for OEM 238-8091, 387-9435, Cross Reference 328-2587 for Excavator E330D E336D original new injector

For B2B procurement teams, diesel repair facilities and fleet maintenance groups servicing Caterpillar heavy equipment, the CAT C9 Series 577-7633 diesel fuel injector is an industrial-grade fuel system component engineered for demanding C9 engine duty cycles. As a complete injector assembly, its core function is to precisely meter, atomize and deliver diesel fuel into the combustion chamber at the required timing and volume, supporting the engine’s factory fuel management strategy for consistent combustion performance. It integrates with CAT C9 diesel fuel injection systems, widely referred to as HEUI-type injectors in aftermarket channels.

This injector is primarily designed for Caterpillar C9 Series diesel engines, including C9 industrial, machine and petroleum power units; selected C9.3 applications require engine serial number verification to confirm fitment. It carries cross-references to OEM, reman and aftermarket part numbers including 557-7633, 20R-8968, 20R-8064 and 235-5261 for database matching, and fits C9-powered equipment such as 330D/336D excavators, 140M/160M motor graders, 627G/637G scrapers and 814F/815F/816F compactors across construction, mining and industrial worksites.

Available condition options vary by supply channel, including new original-type, OEM-equivalent, remanufactured, rebuilt and aftermarket replacement units to suit diverse budgets. It serves buyers ranging from parts wholesalers and engine rebuild centers to machinery owners and fleet operators. Purchasers must verify engine serial number, injector tag, machine model, engine arrangement and ECM calibration before ordering to prevent fitment errors from configuration or emissions system differences.