A question I get asked a lot here at the DOJO (and by my wife's pesky relatives) is: How the heck do I replace a damaged treadmill belt?
If you find your belt slipping, or your deck slowing down and stop, or if the edges of your treadmill belt look worn, frayed or curls up, then you may need to have your treadmill belt replaced. Luckily, replacing the belt isn't as hard as you'd think.
The very first thing you're going to want to do is take a look at your treadmill deck. If the deck looks to be in good shape then there is a good chance it just needs to be lubricated (or waxed). If you see signs of wear such as scratches or grooves then both the deck and belt are probably going to need to be replaced.
If the deck appears fine but your belt is torn, curling or frayed, it's time to replace the treadmill belt. Thankfully, treadmill manufacturers have made it pretty easy to replace a belt even if you're not the Treadmill Sensei.
Most important: Turn your treadmill off and remove the power cord! This way you don't get shocked and you'll guarantee the treadmill doesn't turn on while you're working on it. That would be bad. If your treadmill inclines (which most do), adjusting it a few degrees may make the operation a little easier for you.
You loosen the belt adjustment screws in the back of your treadmill's deck and then slide the rear roller forward and away from the belt. Remove the front roller and then the rear roller. There will be a number of screws along the sides of the deck which attach the deck to the rest of the treadmill. Remove those and you'll be able to remove your deck.
At this point you can slide your belt off. Now is a perfect time to go ahead and lubricate your deck as well. From there, put on your new belt and reassemble your deck.
Taking the time to wax your treadmill deck while the belt is off may be a good idea. It'll keep you from having to do it all over again later on.
Finally, once you have it all back together you're going to want to test the adjustment. Start your treadmill at a slow speed and walk on it firmly. If the belt stops, hesitates or changes speed then you're going to need to adjst the rear screws. Adjust as needed until you are sure the belt isn't slipping or changing speed.
And there you have it, how to replace a treadmill belt.
-The Treadmill Sensei