1. For example, when driving on soft ground, crawler excavators sometimes need to work on soft ground such as swamps and river beaches. If the ground cannot bear the weight of the excavator, it will be unstable.

2. Hold the big arm high when walking, so that the center of gravity of the machine becomes higher and naturally unstable.

3. The cab of the excavator is on the left side, and the passive arm in the middle blocks the line of sight, so there is a big blind spot on the right side, especially on the right rear.