Treadmill adjustment on bowflex 5000tc

There are two hexagonal screws on either side of the front rollers, and four inset hexagonal screws on the back rollers. Turn it on the lowest speed while turning the ones in front, one at a time. You'll see the tread move from one side to the other. Tightening the screws bring the rollers out, pulling the rubber tread taught, and to the left or right, depending on which screw you're turning at the time. The treads should roughly be the same tension, adjusting both inside and outside front screws for each tread. If you have the dual rear rollers, you'd then have to stop the machine after finishing the fronts and tighten the four inset hexagonal screws on each of the rear rollers. No adjustment per se, just tighten them. If you don't, you'll have a sort of clunking, or clicking noise from the imbalance. The single rear roller is a little different, and the adjustment I believe, can be found on this site:

http://nautilus-technics.com/

Good luck.