Komatsu
Crankshaft for Komatsu S6D125
This crankshaft is designed for use in the Komatsu S6D125 engine, which powers various types of heavy machinery including excavators and loaders. It serves as the primary component for converting the linear motion of the pistons into rotational output.
Specifications
- Part number
- S6D125
- Brand
- Komatsu
The crankshaft is the central rotating component within the Komatsu S6D125 engine assembly. It functions by converting the reciprocating linear motion of the engine pistons into the rotational torque required to drive the machine transmission and hydraulic systems. This component features precision-machined journals and counterweights to maintain dynamic balance and smooth operation throughout the engine power cycle.
This specific crankshaft is compatible with the Komatsu S6D125 engine series. It is engineered to meet the original design specifications for fitment within the engine block and alignment with the connecting rods and main bearings. Proper installation ensures the engine maintains correct timing and rotational stability during operation.
In heavy machinery engines, the crankshaft is subject to constant torsional and bending forces generated by the combustion process. It serves as the backbone of the internal combustion system, transferring energy from the cylinders to the flywheel. Maintaining the integrity of the crankshaft and its bearing surfaces is necessary for the overall mechanical function of the engine.

