is affixed to the back side of the arm 54 and at its upper end the evacuation conduit is attached to the end of the flexible pump suction conduit 26 fig1 the bucket rear wall 80 is provided with a central opening 100 fig3 and the lower end of the evacuation conduit 98 extends therethrough as shown in fig4 the lower end of the conduit 98 includes an elbow 102 terminating in the inlet end 104 to which is affixed the bell 106 consisting of a plurality of diverging walls 108 terminating in a lower open end defined by peripheral edges 110 the elbow 102 of conduit 98 extending through opening 100 constitutes a circular configuration whose center is defined as the bucket pivot 62 thus as the bucket 64 pivots about pivot 62 no interference will occur between the conduit 98 and the bucket rear wall 80 and the bucket may be adjusted as desired without interference from the conduit further the bucket bottom wall 82 constitutes a segment of a cylinder whose center is at the pivot 62 and accordingly as the bucket 64 pivots the dimensional clearance between the bottom wall 82 and the bell peripheral edge 110 will be constant as this clearance determines the maximum size of particles which may enter the conduits 98 and 26 and.