on frame 20 the side rails 36 are held in rigid spaced relationship by transverse members including cross struts 40 the outbye pulley 32 is rotatably journaled at the end of the outbye discharge boom between the side rails 36 and may also be connected to hydraulic drive motors 42 to move the belt a pair of elevating jacks 44 44 mounted upright in the frame 20 on each side of the conveyor are connected at their upper ends through suitable flexible or sliding connections to lugs 46 welded to the outsides of the rails by directing hydraulic fluid under pressure to one end or the other of the jacks the outbye boom 34 may be tilted up or down about the axis a a to vary the discharge height any suitable means may be provided for supporting the upper and lower runs of the conveyor belt between the end pulleys for example the conveying run 26 may be supported on troughing rollers 48 and the return run 28 may be supported by sliding engagement on the cross struts 40 or by return rollers or a sliding plate not shown a pair of track type endless crawlers 50 trained between sprockets 52 only one of which is shown per crawler are provided on opposite sides of the main frame 20 drive and control means not shown enable the machine end to be self tramming in inbye or outbye directions the boom 34 has a main section 54 wherein the sections of the side rails 36 are designated 36a and an end section 56 wherein the sections of the side.