Doosan uses Dongming main pump, which is a miscellaneous brand, but it is actually made in China. Komatsu and Carter are their own hydraulic systems. Komatsu is also made in China, but it is definitely much better than Doosan. Sany seems to use imported Kawasaki, which is not bad. To tell the truth, I bought a mountain fighting machine and I was cheated. Poor quality, high fuel consumption and poor service. Make a fuss when buying. Actually, that's another matter. When it breaks down, people ignore you. I didn't come to see it until the seventh day, and I didn't bring my tools. On the ninth day, I came again and said that the accessories were wrong. I suggest buying Carter and Komatsu, and Sany and Kobelco are also good. If you really have financial difficulties, choose domestic Liugong.