sparraw SP-RUN103 Manuel D'utilisation page 51

7.3 Running belt tension adjustment
You may need to adjust the treadmill according to your personal needs.
But after running for a period of time, due to personal weight, the belt
tension may change from default setup. If you realize that the belt is
slippery that may be caused by loose tension, then you need to adjust the
running belt and roller. Please do not adjust too tight that may bring too
much pressure on the motor which would damage the motor, running
belt and roller.
7.4 Running belt far to the right side adjustment
At the operating state, pressing the "+" and " － " or the rise
"SHORTCUT" key can adjust the grade of the treadmill.
⑤ Main frame is not being placed on a flat surface.
⑥ Users are not running in the middle of the belt.
⑦ Forced deviation. After a few minutes no-load rotation, the deviation
can not be automatically restored. If not recovered,you may adjust it
with the 6mm hex key in the Tool Kit, turn it clockwise for 90
degrees. Please see the figure below.
If deviate to the left, then adjust the screw on the left side clockwise or
the screw on the right side anticlockwise.
If deviate to the right, then adjust the screw on the right side clockwise
or the screw on the left side anticlockwise.
The running belt deviation is not covered by the manufacture warranty.
If deviate to the left, then
如果跑带左偏,则顺时针调节左
adjust the screw on the left side
边螺丝或逆时针调节右边螺丝
clockwise or the screw on the right
side anticlockwise.
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If deviate to the right, then
如果跑带右偏,则顺时针调节右
adjust the screw on the right side
边螺丝或逆时针调节左边螺丝
clockwise or the screw on the left
side anticlockwise.