If the land is very hard and difficult to dig, it is recommended to use a larger excavator. At present, the excavators used in all projects are mainly 20-ton excavators. Such as Hyundai 215,225, Carter 320 and Doosan 220,225. I hate Japan. Japan still thinks that the war of aggression against China is to help China and refuses to admit its mistakes, so it doesn't recommend Japanese brands. Japanese brands are of better quality, but their prices are too high.
If you want to make good use of excavators, you should buy German products from the world's first manufacturing country. Modern is good if it is economical. Small domestic excavations below 10 tons are ok, and the quality of large and medium-sized ones is very unstable, so it is not recommended to buy them.