As a piece of equipment favored by the engineering community, the Carter 55 excavator has attracted much attention for its operating performance and digging depth. Caterpillar Inc. has always been committed to technological innovation and optimization, so that the Caterpillar 55 excavator has excellent excavation capacity while maintaining efficient power. Official data show that under standard working conditions, the maximum excavation depth of the Carter 55 excavator can reach about 4.76 meters, which is quite good in the same level of excavators, enough to meet the needs of most infrastructure projects. In actual operation, the deepest depth of the excavator is also affected by many factors such as geological conditions, operation methods and accessory configuration, so it is recommended to pursue the maximum excavation depth at the same time, but also to combine the actual situation to use flexibly, to ensure that the Carter 55 excavator plays the best working efficiency. In general, the Carter 55 excavator has won high recognition from the majority of users for its excellent excavation performance and profound strength, whether it is urban infrastructure, farmland renovation or mining and other fields, its stable and efficient operation can be seen. Understanding and mastering the deepest depth data of the Caterpillar 55 excavator will help us to make more accurate equipment selection and work efficiency estimation in the project planning stage, so as to improve the overall construction efficiency and maximize economic benefits.