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I have a Pro Form C 700 eliptical triner?

It has started making a thumping noise and a jarring motion when I use it. How should I check this out?
Tom, April 2008
Check were the pedal rails are close to the cover. The rail may be hitting the cover.
after that it would possibly be a bearing

mark, April 2008
link Click here to see other fixes for ProForm C 700.