Abstract: An improved support and bearing for mounting the grader blade assembly of a motor grader on the depending support arms of the motor grader circle. Upright bearing housings are mounted on the arms and positioned forward thereof. Each housing has a forwardly open upper jaw and a forwardly open jaw the interiors of which are lined with anti-friction wear strips, and the blade assembly support rails are slidable in the wear strips, the latter being retained by detachable side plates on the housings. One of the lower wear strips is adjustable to maintain a snug sliding fit between the lower rail and all the wear strips in the lower jaws. The wear strips for the upper jaws are mounted in carriers that are vertically movable in the jaws to accommodate lack of parallelism in the support rails.

Abstract: An improved blade clamping mechanism for a motor grader blade which has blade support rails carried in pivoted blade support means for lateral sliding movement, and in which confining surfaces in the blade support means restrict both vertical and fore-and-aft movement of the rails in the support means. A clamp lever is pivoted on the circle of the motor grader and has a clamp arm which can be turned in a vertical plane against the bottom of the lower support rail with a high mechanical advantage to force the rail against an overlying confining surface; and a single action hydraulic cylinder and piston unit which turns the lever simultaneously presses a clamp shoe against the rear of the upper support rail. The clamps are normally locked by hydraulic pressure on the piston, and released by moving a manually controlled valve to a drain position so that a return spring acting on the clamp shoe can move the shoe and the lever to a release position.

Abstract: A motor grader has a circle which includes integral depending arms at the rear, blade carrying structure is supported forward of the arms on transverse pivots which are at the lower extremities of the arms, and hydraulic cylinder and piston units are supported for limited universal movement in sleeves which are integral with the circle, the pistons of said units being pivotally connected to the blade carrying structure for tilting the latter about the transverse pivots. The cylinder unit supports include flanged collars on the cylinders on which spherical bearings are removably mounted, and bearing sockets in the sleeves consisting of two annular elements which are detachably connected to each other. Flexible dust proofing boots enclose the spherical bearings and sockets; and an interengaging slot and hub restrict rotation of each unit in the sleeve.