A split-deck screening device for screening bulk material comprising: a main sub-frame mountable on a main frame; a primary screen box comprising a plurality of screening decks having a loading end to receive a supply of bulk material and an opposite discharge end to discharge non-screened material; a secondary screen box mounted to the main sub-frame comprising a plurality of screening decks having a loading end adjacent to the discharge end of the primary screen box and an opposite discharge end to discharge unscreened material; characterised in that the split-deck screening device comprises: a primary screen box sub-frame coupled to the main sub-frame having a discharge end and a loading end, and a sub-frame carriage for coupling the primary screen box sub-frame to the main sub-frame attached at each side of the discharge end of the primary screen box sub-frame and actuable to move the primary screen box from an operative position in which the discharge end of the primary screen box is disposed adjacent to a loading end of the secondary screen box to an inoperative position in which the primary screen box is spaced above and away from the secondary screen box to thereby provide access to one or more lower screening decks in the secondary screen box; and a first actuator to actuate the sub-frame carriage. a main sub-frame mountable on a main frame; a primary screen box comprising a plurality of screening decks having a loading end to receive a supply of bulk material and an opposite discharge end to discharge non-screened material; a secondary screen box mounted to the main sub-frame comprising a plurality of screening decks having a loading end adjacent to the discharge end of the primary screen box and an opposite discharge end to discharge unscreened material; characterised in that the split-deck screening device comprises: a primary screen box sub-frame coupled to the main sub-frame having a discharge end and a loading end, and a sub-frame carriage for coupling the primary screen box sub-frame to the main sub-frame attached at each side of the discharge end of the primary screen box sub-frame and actuable to move the primary screen box from an operative position in which the discharge end of the primary screen box is disposed adjacent to a loading end of the secondary screen box to an inoperative position in which the primary screen box is spaced above and away from the secondary screen box to thereby provide access to one or more lower screening decks in the secondary screen box; and a first actuator to actuate the sub-frame carriage. a primary screen box sub-frame coupled to the main sub-frame having a discharge end and a loading end, and a sub-frame carriage for coupling the primary screen box sub-frame to the main sub-frame attached at each side of the discharge end of the primary screen box sub-frame and actuable to move the primary screen box from an operative position in which the discharge end of the primary screen box is disposed adjacent to a loading end of the secondary screen box to an inoperative position in which the primary screen box is spaced above and away from the secondary screen box to thereby provide access to one or more lower screening decks in the secondary screen box; and a first actuator to actuate the sub-frame carriage.