Hello! We have a ProForm 550 treadmill. No matter how many times we straighten and tighten the belt, it immediately moves to the side rendering the treadmill unusable. Any thoughts regarding what is wrong and how to fix the problem? Thank you for your help!

there are two bolts on the rear of treadmill walking deck. these are adjustment bolts. start with the belt going 3mph. tighten the side where the belt is closest.only go 1/4 turn at a time.give it 15-20 seconds for belt to track or move over. continue until centered.

see the video attached, and follow the step. God bless you

proceed according. God bless you

If the treadmill belt continues to slip even after you have adjusted the rear roller bolts, then it is time to replace the running belt. These belts do stretch over time and must be replaced when they stretch to the point that it can no longer be tightened enough to not slip.
https://www.sportsmith.com/walking-belt/product/31332

what do you mean off like completly off or to one side. you need to balance the tension on the w/belt otherwize the blet will creep to the left or right. if the belt goes to the right tighten the right and loosen the left, when the belt get to where you want it. tighten the side you made the belt move to this will keep it centered

hi you need to tighten the left side a turn or two and loosen the right side one or two. this is while the tread is on 3-4.once it moves over to where you want it. tighten the rite side . PS to tighten or loosen the bolts to the w/belt. clockwize is tight, and counter is loose

you need to adjust the travel of belt. to do this you need a allen wrench that came with it. if you have it run treadmill at slow speed,go to the rear right at the right end cap there is a hole, use the allen wrench and unscrew slowly while watching the belt until returns to the middle. if it slips when walking go back to rear and adjust by screwing in one turn on each side until belt wont slip.

Hello,

The belt is adjusted at the rear of the treadmill, On both rear corners there are plastic covers with holes in them. You should have a allen wrench that came with the machine. You turn the screw clockwise to tighten, it should feel snug. Next start the treadmill and watch the belt, it will go to one side or the other. To center the belt, you need to tighten the side that the belt is CLOSEST to. Turn it only half a turn at a time until watching it moving, it stays in the center.

You should not have to do this often, The manual says about 1.5 inches of deflection t the edges of the belt. Tight is good.

Hope this helps

If you need further help, I’m available over the phone at https://www.6ya.com/expert/matt_8dbc24bf722649ac

There should be an allen head bolt on each side at the rear of the treadmill going throughthe rear cover into the tail [rear] roller. Turn each one 1/4 turn at a time equally untill slipping is stopped. If belt tracks more to one side tighten slightly more on that side.

I think you are talking about the front roller. It has a rubber sleeve that helps to grip the walking belt. Sometimes you can tighten this enough to keep it from slipping but you run the risk of overtightening and damaging both rollers. We recomend replacing that roller.