and lowered as well as placed in an angled position by the hydraulic cylinder 18 and the telescoping strut 19 also supported on the main frame 14 is the operator 39 s cab 16 and the housing 15 for operating machinery referring specifically to fig2 the pipe positioner generally 24 is supported for linear motion inwardly and outwardly from the mast 17 it includes the tubular frame members 25 and 26 mounted on the mast to provide in part a frame member activating means for a frame member including the slidable arms 29 and 30 which telescope with respect to the tubular members 25 and 26 and is interconnected by the crossarm 31 the crossarm 31 will support the jaw engaging means generally 32 the mast includes the usual frame structure composed of the vertical supports 20 and 21 as well as the cross members 22 and 23 as best seen in fig2 and 3 the hydraulic cylinders 27 and 28 are connected to the mast 17 at one end and to the slidable arms 29 and 30 at the other the hydraulic cylinders 27 and 28 also form a part of the frame member activating means and are positioned inside the inner slidable arms 29 and 30 this is best seen in fig3 with respect to hydraulic cylinder 27 positioned inside tubular slidable arm 29 it will.