ADJUSTMENT OF RUNNING BELT
Moving to the left
Adjustment: Turn off the power. Clockwise rotate the bolt of the left rear roller by 1/4 turn with the 5mm Allen wrench to tighten the running belt. Then power on the machine and test whether the running belt is centered. Adjust the running belt with this method until it is centered.
Moving to the right
Adjustment: Turn off the power. Clockwise rotate the bolt of the right rear roller by 1/4 turn with the 5mm Allen wrench to tighten the running belt. Then power on the machine and test whether the running belt is centered. Adjust the running belt with this method until it is centered.
The running belt will be loose after being used for a period of time. Loose running belt will slip during use.
Adjustment: Turn off the power. Clockwise rotate the bolts of the left and right rear rollers by 1/4 turn simultaneously with the 5mm Allen wrench to tighten the running belt. Then power on the machine and test the tightness of the running belt. Adjust the running belt with this method until its tightness is appropriate.
Note: When you are running on the walking machine, the pressure on the running belt is imbalanced as the force applied by your feet on the belt is different, which will deviate the running belt from the center. Such deviation is normal and the running belt will return to the center if no one runs on it.
The running belt cannot be tightened too much. Failure to do so may damage the running belt, the roller bearings, etc., increase the pressure on the front/rear rollers, and cause abnormal noise or other problems.
https://manuals.plus/urevo/ur9tm0011-2-in-1-under-desk-treadmill-manual#ixzz7rAzU2zYT