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Advantages Imported engine, powerful, stable performance, fuel efficiency, the ideal power reserve, has good power and reliability. Hydraulic systems critical hydraulic parts are domestic and international famous brands, using the latest technological achievements, low energy consumption, fast response, precise control, the impact of small, strong digging force and excellent operating efficiency. Most powerful 21 tonne excavator. Jongyang JYL621E is the most popular model of China 21T crawler excavator.