Caterpillar original Diesel Common Rail Fuel Injector Replacement 222-5966, fits Cat 3126B engines, cross references 10R-0781 10R-1306 for excavator truck diesel fuel systems original new injector

For B2B purchasers sourcing diesel engine aftersales parts, this CAT 3126-series HEUI diesel fuel injector is a remanufactured replacement unit matching OE part number 222-5966. It supports interchange with all listed cross-reference numbers, including hyphenated and non-hyphenated codes, CA-prefixed catalog codes and EX-series alternatives, to simplify part matching across supplier and OEM catalog systems. It is specified for fitment on 3126, 3126B, 3126E and C7 diesel platforms, serving as a direct replacement for worn injectors during repair and maintenance.

This injector accommodates a broad range of heavy-duty use cases across core industrial sectors, with confirmed application in truck, marine, construction and general industrial engine setups. Its HEUI configuration aligns with the design requirements of the supported 3126 engine family, enabling distributors and maintenance providers to cover multiple customer segments with one universal part number. This cross-sector compatibility helps businesses reduce separate injector SKUs held in inventory for mixed equipment fleets.

As a dedicated replacement reman part, it is a standard offering for diesel engine repair and overhaul operations servicing CAT-powered equipment. Procurement and warehouse teams can map any listed interchange number to this single SKU, lowering mismatch risks and streamlining inventory and sourcing workflows. It is a core stock item for diesel parts wholesalers, fleet maintenance teams and marine service centers focused on 3126-series engine support.