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Why does the belt on my Proform 520X treadmill slow down when I walk on it?

I have a Proform 520X treadmill and it slows down when I walk on it and I was wondering what to check for this problem.

Treadmills , Body Building and Toning
1 Answer from this member:
Fred M
by Fred M Earned 173 community points in Body Building and Toning
September 3rd, 2009
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