Do you know how a hydraulic excavator rotates? We will show you how a hydraulic excavator works in detail. Let's see how each part works. (Top menu) Work Equipment This is how it works. It can transform into several different machines. Upper Structure The relation between the engine and oil. Mechanism of turning. How does it move ? Lower Structure Different kinds of feet. The way crawlers move. Secret for the power. (hydraulic mechanism) Hard working hydraulic excavators.