One is the computer board, which needs brushing. One is mechanical, just take it apart and adjust it.

1, excavator, also known as excavator, is an earth-moving machine that excavates materials above or below the bearing surface with a bucket and loads them into transport vehicles or unloads them to the yard.

2. The materials excavated by excavators are mainly soil, coal, sediments and pre-loosened soil and rocks.

3. The three most important parameters of excavator: working weight (mass), engine power and bucket capacity.