Re: Looks like you get access behind the disc
eliot
It turns out ( and I did it all by myself!) that if you lift up the linear part of the sander to its vertical position, then right under there is a black plastic box that houses the motor. So it was almost a snap to take off the box and tighten the belt. I say "almost" because I had a real misery when I unscrewed the motor (which I shouldn't have done.) There are three motor hold-down bolts that you have to adjust slightly to re tension the belt on the pulley. BUT--and here's the problem-- getting the bolts back into their slots was practically impossible. ( They are more or less hidden under the motor.) I finally did it by taking off the pulley altogether so I could have more room to shift things around. Honestly, it nearly killed me to be bending over for all that time; but I finally got it all done. At 82, it's not all my other aches and pains that get me; it's my back that gives out.
Incidentally, when I called Delta for help, I got nothing; they knew nothing, and referred me to "E- reprair parts -something -or-other", who knew even less. Lots of talk though. So, the old saying is true," If you want something done right, do it yourself "