Caterpillar original Caterpillar 235-5261 Mechanical Fuel Injector for C7 C9 Excavator Engine Common Rail new injector original new injector

Engineered for heavy-duty diesel applications, the 235-5261 fuel injector assembly delivers precision fuel metering and fine atomization for C7 and C9 diesel engines. The injector is designed as a direct replacement solution for construction machinery, industrial power units, generator sets, mining equipment, and quarry machinery, supporting stable combustion, controlled emissions, and dependable equipment uptime in demanding operating environments.

This injector features a durable metal body, engineered nozzle geometry, high-pressure sealing structure, and flow-balanced performance to maintain rated engine power and reduce smoke. It is commonly installed on excavator models 324D, 325D, 329D, 330D, and 336D, and is compatible with HEUI and common diesel injection systems. Authorized cross references include 265-8106, 266-4446, 387-9426, 387-9430, 10R4761, 222-5961, 233-3536, 236-0973, 241-3238, 243-4502, 293-1408, 328-2583, 222-5959, and 20R8057. Final fitment must be confirmed by engine serial number, arrangement number, machine model, and the old injector part number.

Recommended service practice includes clean diesel fuel, scheduled fuel filter replacement, regular water separator draining, and clean air filtration. Injector balance testing is advised when rough idle, misfire, black or white smoke, hard starting, engine knock, high fuel consumption, or power loss occurs. When multiple injectors show uneven flow or wear, full-set replacement is recommended to protect combustion stability and reduce installation risk.