Caterpillar 1512939 Main Bearing STD

The 1512939 main bearing is a standard-size replacement component designed for Caterpillar C9, C9.3, and C-9 series diesel engines. It provides a conformable running surface for the crankshaft journals within the engine block, ensuring proper oil clearance and load distribution under high combustion pressures. Manufactured to meet or exceed OEM specifications, this bearing features aluminum alloy construction for optimal embeddability, conformability, and fatigue resistance in demanding heavy equipment applications. Each part number 1512939 represents one bearing half; a full engine set requires multiple pairs depending on the specific crankshaft configuration. Compatible with Caterpillar 336D, 330C, M330D excavators and Challenger MT700 series tractors.