How do I know if the walking belt is properly tightened?

When the walking belt is correctly tightened, you should be able to lift each edge of the walking belt 2 to 3 inches off the walking platform. If the belt is overtightened, treadmill performance may decrease and the walking belt may become damaged. Use the hex key to turn both rear roller bolts counterclockwise 1/4 of a turn to loosen, or clockwise 1/4 of a turn to tighten, checking the tension after each adjustment.