Abstract: A loader boom support frame includes opposite upright sides including double-walled portions that have their undersides interconnected by front and rear crossbars, the crossbars being adapted for connecting the loader frame to a pair of longitudinally extending track support frames. Secured to the rear of the boom support frame so as to form an integral part thereof is a transverse transmission housing, the connection of the housing with the boom support frame including a pair of premachined compression links welded in abutting relationship to both the transmission housing and the rear crossbar. The rear ends of a pair of loader boom lift actuators are adapted to be connected to the opposite sides of the frame at receptacles located just forwardly of the rear crossbar in general fore-and-aft alignment with the compression links.