The belt is the significant component of the treadmill. Ensure it is always tight. However, it may get loose over time, and hence you need to be careful when using the machine. Here are some situations that will determine the firmness of the belt and helps you adjust it accordingly. *Check the treadmill after every 20 hours of use to see if the belt and bolts of the belt are intact. *Tighten the belt after a period of regular use. *Whenever you hear any squeaky sounds from your device or if you notice any abnormal operation that disrupts the smooth running of the machine or when the motor gets overheated. *If you can lift the running board by more than 1-2 inches on either side, that is a sign to tighten the belt immediately.