Caterpillar 3133997 Crankshaft Assembly

The 3133997 crankshaft assembly is a direct-fit replacement for Caterpillar C13 12.5L six-cylinder diesel engines. It features an integrated drive gear, precision-ground main and rod journals, and induction-hardened surfaces for wear resistance under heavy loads. The forged steel construction ensures structural integrity and consistent oil film support. This component converts reciprocating piston motion into rotational torque for propulsion and hydraulic power in construction and mining equipment. OEM cross-references include 313-3997, 10R2110, 10R-2110, 2219364, 3124593, 1950306, 5499N, and BS3343. Aftermarket equivalents are available from PAI (370043), CTP, Q-Power (AM3133997), and KMP Brand. Verified fitment spans Caterpillar 345C, 345D, 349D hydraulic excavators, 730/730C articulated trucks, D8N track-type tractors, 972H/980K wheel loaders, 621K/627K wheel tractor-scrapers, and 16M motor graders equipped with C13 power units.