Main bearing pair for Komatsu GD511A

The 6204-21-8100 main bearing pair serves as a support component for the crankshaft in the Komatsu S6D95L-1 engine. These bearings are installed within the engine block to provide a precise surface for the crankshaft to rotate against, managing the loads generated by combustion and piston movement while maintaining the necessary oil clearance for hydrodynamic lubrication.

This component is specified for standard size applications, suitable for crankshafts that have not undergone machining or grinding. It is compatible with Komatsu GD511A and GD511A-1 motor graders equipped with the S6D95L-1 engine. Proper installation ensures the alignment of the rotating assembly and helps maintain the internal tolerances required for engine operation.

Main bearings function by separating the moving crankshaft from the stationary engine block, preventing metal-to-metal contact. By distributing the mechanical loads across the bearing surface, they minimize friction and allow the engine to operate efficiently under load. Maintaining the correct oil film thickness between the bearing and the crankshaft journal is necessary for the service life of the engine internals.