Did you change your printer margins to 0.4 or 0.3 for left and right? If that doesn't fix it, the problem is likely your printer margin can't be set that small.
Follow the directions, or have someone more technical do it for you if it is geek to you, to change the Width="85%" on the topmost Table. This controls the overall width of the text copy for the entire manual. You CAN solve your problem with this. If you don't understand it, get help from someone local. MTU has provided two ways to solve this problem. We can't help any further.
