The wheelbase is lengthened. Thus, the advantages of the long wheelbase are used and it can be used under heavy load. The wing box with castling lug is adopted for the front frame, and the bending plate with various stiffness is welded into the box beam with deformed section to make up the rear frame. Thus, it has high bearing capacity. The rolling bearing+knuckle bearing are adopted in the hinged position of the front and rear frames. The bearing capacity is high and the it is highly stable. Designed with big steering angle, flexible, suitable to a lot of workplaces Pressurized cab, increasing 20% of space, wide view, sound insulation and noise reduction, comfortable to operate. Varied configuration, complete parts, meeting construction requirements for different areas and working conditions Configure special models for conditions of the logical power plants: for example, grasping grass machine (configure high loader, grasping grass machine, oil filter, spark arrester, single layer radiator and so on)