I need help, when I start a project, the truck moves all the way to the left (towards the key pad) and keeps going and does'nt want to stop, the belt keeps turning but the truck is all the way to the end, then I get a message on the key pad (Y axis problem). If I move it to the middle and try again sometimes it gets stuck before it gets to the end , the belt guide (I think thats what its called) rubs or hits the back almost where the y motor sits, anyway I can't figure out what to do, I bought it used w 750 hrs and I probably already put on another 50hrs or so. thanks for any input