Abstract: An excavator assembly 10 including an excavator body having a pair of tracks 12 an 13, a cab 14, an articulated boom 15 and a trenching or cutting attachment 16 mounted at the end of the boom 15. The trenching or cutting attachment comprises a blade 17 mounted to a box-like drive mounting 18 with the box-like mounting 18 having on an opposite side thereof an excavator mounting 19 element so that the attachment can be detached from the excavator. A swivel arrangement is provided for swivelling the blade 17. The excavator mounting is a standard hoe bucket fitting.