Abstract: The bulldozer blade control mechanism according to the present invention has a U-shaped frame (22) fixed to the lower intermediate portion of the rear surface of a blade (20) so that the frame (22) can be turned in all directions, left and right lifting and angling hydraulic cylinders (62, 64) respectively fixed pivotably to between the left and right portions of the rear surface of the blade and the left and right portions of a chassis via arms (36, 38), left and right pitching and tilting hydraulic cylinders (40, 42) respectively fixed pivotably to between those portions of the arms (36, 38) which are in the vicinity of the rear ends thereof and the left and right upper portions of the rear surface of the blade, and left and right levers (56, 58) respectively fixed pivotably to between the left and right parallel leg portions of the U-shaped frame (22) and either of left and right hydraulic cylinders (62, 64) and left and right arms (36, 38).

Abstract: A steering control apparatus for use in endless track type tractor which comprises a pair of control members, a barrel rotatably mounted on a stationary shaft, said control members being fixedly secured to the barrel, a pair of valve connecting levers fixedly secured to the barrel, a valve for steering control clutch for releasing the clutch when actuated, the valve having stems mounted at both ends thereof, and a pair of clutch yokes for releasing clutches when actuated, the clutch yokes being connected to the valve.