Cummins 5261375 Crankshaft Assembly

The Cummins 5261375 crankshaft is a precision-machined forged steel component designed to convert reciprocating piston motion into rotational torque for 3.8-liter four-cylinder diesel engines. It features induction-hardened journals and fillet radii optimized for fatigue resistance under heavy-duty cyclic loading. This assembly serves as direct replacement for Cummins ISF3.8, F3.8, and QSF3.8 engine platforms utilized in construction machinery and light commercial vehicles. Material composition is high-grade forged alloy steel (typically 42CrMo or equivalent) with nitrided or induction-hardened bearing surfaces. The part integrates timing gear mounting provisions and oil feed drilling per OEM specification. Cross-reference interchangeability includes Cummins part numbers 5261376 and 4938752, alongside aftermarket references 5261375UX, 4896766, and 5272079. Verified applications encompass Case WX170 and WX200 hydraulic excavators, Hyundai 35D-9 and 45D-9 forklifts, and Foton Aumark light trucks equipped with the ISF3.8 powerplant.