A tracked, portable radial stacker for stockpiling bulk material, comprising: a linear conveyor having a rear portion and a front portion and being designed to carry bulk material from a lower position adjacent the rear portion to a raised position adjacent the front portion; a continuous track system including a frame to which the conveyor is mounted, the track system including a pair of driven, parallel tracks; a pair of wheels (46, 47) mounted to the frame which are displaceable between a raised lateral position in which they do not contact the ground and a first lowered position in which they are laterally disposed and engage the ground to facilitate lateral conveyance of the conveyor; and wheel displacement means for powering the pair of wheels (46, 47) from the raised lateral position to the first lowered position; characterized in that the pair of wheels (46, 47) are rotatably mounted to the frame such that they can swivel at least 90 degrees to a raised longitudinal position and can be lowered to a second lowered position in which they are longitudinally disposed and engage the ground to facilitate longitudinal conveyance of the conveyor; and the wheel displacement means also power the wheels when in the first lowered position to lift the tracks off the ground to permit the conveyor to be conveyed in a lateral direction, the wheel displacement means also powering the pair of wheels (46, 47) from the raised longitudinal position to the second lowered position, the wheel displacement means also powering the wheels (46, 47) when in the second lowered position to lift the tracks off the ground to permit the conveyor to be conveyed in a longitudinal direction. a linear conveyor having a rear portion and a front portion and being designed to carry bulk material from a lower position adjacent the rear portion to a raised position adjacent the front portion; a continuous track system including a frame to which the conveyor is mounted, the track system including a pair of driven, parallel tracks; a pair of wheels (46, 47) mounted to the frame which are displaceable between a raised lateral position in which they do not contact the ground and a first lowered position in which they are laterally disposed and engage the ground to facilitate lateral conveyance of the conveyor; and wheel displacement means for powering the pair of wheels (46, 47) from the raised lateral position to the first lowered position; characterized in that the pair of wheels (46, 47) are rotatably mounted to the frame such that they can swivel at least 90 degrees to a raised longitudinal position and can be lowered to a second lowered position in which they are longitudinally disposed and engage the ground to facilitate longitudinal conveyance of the conveyor; and the wheel displacement means also power the wheels when in the first lowered position to lift the tracks off the ground to permit the conveyor to be conveyed in a lateral direction, the wheel displacement means also powering the pair of wheels (46, 47) from the raised longitudinal position to the second lowered position, the wheel displacement means also powering the wheels (46, 47) when in the second lowered position to lift the tracks off the ground to permit the conveyor to be conveyed in a longitudinal direction.