PURPOSE:To vertically erect a blade on both left and right positions only by operating each cylinder by pivotally supporting one ends of paired lift cylinders and a center shift cylinder on a bracket provided to the vehicular frame in an invariable manner. CONSTITUTION:One ends of lift cylinders 6a and 6b are pivotally supported on brackets 9 and 10 projectionally provided to left and right sides of the vehicular frame 1 of a motor grader, and one end of a center shift cylinder 7 is pivotally supported on the bracket 11 projectionally provided to the downside of the vehicular frame 1. On the other hand, the other end of the center shift cylinder 7 and the other end of the lift cylinder 6a are pivotally supported on the left end of the draw bar 2, and the other end of the lift cylinder 6b is pivotally supported on the right end of the draw bar 2. On the left and right sides, the blade can thus be erected vertically only by operating the lift cylinder and the center shift cylinder.
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