The manual is OTW, however in the mean time to change the belt. Simply hold the sander so that the front wheel is on your work bench. Place pressure on the wheel until it moves in and clicks into a locked position. Once you have new belt on, place a screwdriver between idler pully and support bracket (right side center). Place pressure on idler pulley, pressing towards front of sander. The pressure wheel will click release and spring pressure will return to belt. Hold unit upside down, carefully apply power, and adjust screw on opposite side from where you released the idler pulley - it will adjust tracking in and out from striker bar.
Didn't realize the sander was such an old model but I don't feel like such a doofus for not being able to figure out how to change belts now with so many requests from people more talented than I with tools..I could also use a soft copy[?] of directions if you still have them. thanks