of the bucket support arm 8 39 further over a pulley 44 provided on the boom 4 39 above the articulation shaft 39 of the bucket arm 8 39 further over a pulley 45 provided adjacent the lower end of the bucket support arm whereas its opposite end is secured to a fitting 46 on the boom 4 39 alternatively the arm 8 39 when the drag bucket 21 with the aid of the piston and cylinder unit 36 37 and the line 19 has been brought to the earth moving starting position in which position the bucket support arm 8 39 has been swung outwards to the position illustrated in fig3 the bucket support arm is pivoted counter clockwise with the aid of the piston and cylinder unit 40 41 e g to the position shown in fig4 whereby the line 27 pulls the drag bucket 21 in the direction towards the basic machine 1 owing to the increased distance between the pulleys 44 and 45 following the pivotal movement of the bucket support arm 8 39 and as a consequence thereof hauling in of the line 27 a separate pulling arm 10 like the one shown in fig1 and 2 in this case therefore is not considered necessary when a basic machine 1 equipped with the boom 4 the bucket support arm 8 and a digging bucket pivotally mounted at the outer end of the arm is to be converted into an excavator utilizing a drag bucket 21 the boom 4 the bucket support arm 8 and the digging bucket are replaced by the.