Abstract: In accordance with this invention I provide a curb laying machine designed to extrude curbing of molten asphalt or concrete in a parking lot or the like. This machine utilizes a wheeled chassis, and a curb mold removably carried on a lower portion of the chassis, with the lower edges of the mold in contact with the ground during the laying of curbing. An engine driven auger is utilized for bringing about the extrusion of curbing through the curb mold as the machine moves slowly forward. My machine utilizes a chassis, steerable front wheels supporting a forward portion of the chassis, and first and second rear wheels mounted on a rearward portion of the chassis. The improvement in accordance with my invention comprises a rapidly operable height changing mechanism associated with the first rear wheel, latter wheel being located in the immediate vicinity of the curb mold.