Abstract: An excavator boom has attachment means formed on opposite ends thereof for attachment to a vehicle and to a work implement. The boom comprises a pair of continuous and uninterrupted upper and lower plates and a pair of side plates, all secured together by four continuous welds to form a box section throughout the length of the boom. The boom is generally V-shaped and has a third attachment means formed at the apex thereof. During fabrication of the boom, the various plates and attachment means are positioned in suitably arranged fixtures and are tack welded together. The boom is then placed on each of its sides for final welding purposes.

Abstract: A combination track-idler and roller recoil suspension system is afforded through use of a crank member pivotally fixed to a track frame, and a link member pivotally fixed to an end of the crank member, and to which the idler is rotatably mounted. The other end of the crank member is associated with a resilient pad utilized as a mounting pad for a track roller, so that the resilient pad serves both as a suspension member for the roller, and as idler recoil means upon movement of the crank member. The link member accommodates generally vertical idler movement, through pivoting of the link member relative to the crank member.

Abstract: .Iadd.The steering clutches and steering brakes of a tractor are operated by foot pedals. Each of two pedals operates to release its respective clutch and apply the corresponding brake. A third pedal, located intermediate the other two, applies both brakes without operating the clutches. .Iaddend.