Locate the front or rear roller, depending on your model, and gently lift the belt in the center of the deck. Visually, the belt might appear to be riding too high in the center or making loud squealing noises even when the machine is warmed up.
Using a Wrench to Adjust Belt Tension
Checking the Manual Tension Test To determine if your belt needs to be loosened, perform a simple manual test. If you can lift the belt significantly higher or if it moves side to side with very little resistance, it is likely too loose and needs adjustment in the opposite direction.
Making Incremental Adjustments Never attempt to loosen the belt all at once; this can lead to misalignment. This process requires patience and attention to detail, but the results are immediately noticeable in the form of quieter operation and consistent belt movement.
Using a Wrench to Adjust Belt Tension
You might also notice that the motor struggles to start or stops suddenly during use, as it cannot handle the resistance. Start the treadmill at a low speed and observe the belt's movement.
More About How to loosen treadmill belt
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