With high pressure common-rail electronic injection engine that meets EU stage-V emission regulations equipped, XE220E crawler excavator achieves the best fuel injection control, improving combustion efficiency, saving energy, and protecting environment. Dual-fuel-filter-element fuel protection system; two-stage oil-water separation help realize high filter fineness and strong oil adaptability. Full-size heavy-duty reinforced chassis structure and design of reinforced structural device can ensure the stability of the whole machine while satisfying the powerful digging force. The reinforced attachment, combined with the high-pressure system design, can ensure that the machine possesses the most powerful digging force among the same size of machines and can easily cope with various working conditions.