XCMG hydraulic long arm excavator is mainly applied to the construction of water conservancy works, port construction, river and lake dredging, and other engineering. Its standard tracks can reduce the ground specific pressure and increase the working condition applicability of hydraulic excavators; by virtue of the hydraulic control system of the XCMG’s patented super-long working mechanism, the operator can easily control this kind of hydraulic excavators; the excellent design and manufacturing technology for the super-long working mechanism has ensured the long service life of the mechanism.