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Manage My Life

I have a Proform 730 CS treadmill, model number 831 299270, why does it jerk when I am trying to walk or run?

It runs fine when nothing is on it, but when I try to walk or run on it starts jerking and doesn't go smoothly. I have checked the belt by the motor, which seems fine.

Treadmills , Body Building and Toning
1 Answer from this member:
Manage My Life
by Manage My Life
November 23rd, 2009
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