Adjusting while Treadmill On
Find the screws required to adjust the belt. Often they are located towards the back near the roller axle. Most treadmills use Hex screws. Hex screws have a six sided head and need an Allen Wrench or a hex key.
Turn the treadmill on. Adjust the speed to 3 miles (5 kilometers) or less.
Adjust the screws. If the belt needs loosening turn the screws clockwise. If the belt needs tightening turn the screws anticlockwise. Turn each screw no more than a quarter turn each time. Adjust each screw the same number of turns. If the belt needs centering to the right tighten the right screw. If the belt needs centering to the left tighten the left screw.
Keep adjusting until the belt does not slip and is in the center. It should be centered between the two boards and tightened until the belt does not slip.
Adjusting while Treadmill Off
Switch the treadmill off and unplug it from the wall.
Find the screws required to adjust the belt. Often they are located towards the back near the roller axle. Most treadmills use Hex screws. Hex screws have a six sided head and need an Allen Wrench or a hex key.
Adjust the screws. If the belt needs loosening turn the screws clockwise. If the belt needs tightening turn the screws anticlockwise. Turn each screw no more than a quarter turn each time. Adjust each screw the same number of turns. If the belt needs centering to the right tighten the right screw. If the belt needs centering to the left tighten the left screw.
Plug in the treadmill and see if the belt needs adjusting.
Keep adjusting until the belt does not slip and is in the center. It should be centered between the two boards and tightened until the belt does not slip. Each time you adjust turn the treadmill off and unplug it. When you test the treadmill plug it in and turn it on.
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