Why under carriage of dozer is different from excavator?

The undercarriage of a dozer is designed for pushing and grading, featuring wide tracks and a stable frame to distribute weight and enhance stability on uneven terrain. In contrast, an excavator's undercarriage is built for mobility and versatility, often incorporating a more compact design with a rotating upper structure that allows for a greater range of motion. Additionally, the tracks of an excavator are typically narrower and longer, optimizing for digging and lifting rather than pushing. These differences reflect the distinct operational functions and requirements of each machine.