assembly relative to the tractor 10 in an arc based on a pivot 18 the arm 14 is pivoted to the arm 13 of the back hoe assembly by a pivot 19 and the boom extension 11 is pivoted to the outward end of the arm 14 by a pivot 20 in order that the boom extension 11 may be moved in an arc based on the pivot 20 a pair of apertured plates 21 are mounted on the adjacent end of the boom extension 11 and a first pair of levers 22 are pivoted to the apertured plates 21 by a pivot 23 which is positioned in one of a number of the apertures in the apertured plates 21 a second pair of levers 24 are pivoted by a pivot 25 to the outer end of the arm 14 of the back hoe attachment 12 and to the inner end of the first pair of levers 22 and to the piston rod of the piston and cylinder assembly 16 by a pivot pin 26 it will thus be seen that the boom extension 11 replaces the bucket which is usually attached to the outer end of the arm 14 of the back hoe attachment 12 it will thus be seen that a tractor having a back hoe attachment is capable of.