At the end of of the running belts in the end caps will adjusting bolts you will need a allen wrench to adjust the tension. Start your treadmill and turn clockwise a 1/4 turn each time see i f you can stop the belt. You need to be aware that the drive belt can also cause this problem so I suggest that you remove the motor shroud and when you are adjusting whether the front roller is moving and the running belt has stopped or the roller has stopped and motor is rotating ( adjust Drive Belt)
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At the end of of the running belts in the end caps will adjusting bolts you will need a allen wrench to adjust the tension. Start your treadmill and turn clockwise a 1/4 turn each time see i f you can stop the belt. You need to be aware that the drive belt can also cause this problem so I suggest that you remove the motor shroud and when you are adjusting whether the front roller is moving and the running belt has stopped or the roller has stopped and motor is rotating ( adjust Drive Belt)