Patent ID: 8118316

Claim:
A method of operating a road-building machine, comprising: (a) providing a road-building machine including: a chassis having a forward direction; a left front ground engaging support; a right front ground engaging support; a left rear ground engaging support; a right rear ground engaging support; a first working cylinder rigidly connected to the chassis and connected to the left front ground engaging support for adjusting a height of the left front ground engaging support relative to the chassis; a second working cylinder rigidly connected to the chassis and connected to the right front ground engaging support for adjusting a height of the right front ground engaging support relative to the chassis; a third working cylinder rigidly connected to the chassis and connected to the left rear ground engaging support for adjusting a height of the left rear ground engaging support relative to the chassis; a fourth working cylinder rigidly connected to the chassis and connected to the right rear ground engaging support for adjusting a height of the right rear ground engaging support relative to the chassis; a rotating working drum supported from the chassis between the front ground engaging supports and the rear ground engaging supports and extending transversely to the forward direction; each of the working cylinders including at least one working chamber filled with a pressure medium; and coupling lines connecting the working cylinders to one another and providing a positive hydraulic coupling between the working cylinders; (b) adjusting the height of the left front and right rear ground engaging supports in a first direction; and (c) adjusting the height of the right front and left rear ground engaging supports in a second direction opposite the first direction.