Diamondback 510T Operating Instructions Manual page 27

Care and Maintenance
Motor Belt Tension Adjustment
When you need to adjust the degree of tightness of motor belt, please open the cover of the motor
firstly.
During your workout, if you find the running belt is not running smoothly, that means the motor belt is
loosing, please follow the below steps to adjust the motor belt tension:
1. Turn the motor belt adjustment bolt using an M8 Allen wrench 1/4 turn in a clockwise direction.
2. Re-Start the treadmill and run on the treadmill; if the running belt is still not working properly,
repeat the above step.
3. Please do not make the motor belt too tight; if the belt is over tightened it will overload the
treadmill and reduce the motors life.