Question about Proform 370E Treadmill Walking Belt

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Belt is slipping

We have a Proform 720 treadmill that we bought used about a year ago. The last time I used it (2-3 months ago) it worked fine, however, the belt is now slipping. When my heavier husband tries to use it, the belt stops completely. Any ideas on how to solve this problem? Thanks!

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  • edgemontrd Jan 27, 2009

    motor will run , once you step on it it wll stop but the motor is still running

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  • 83 Answers

This is caused by one of three problems. First and most likely, the walking belt is loose. To tighten the belt, start by locating the two bolts that adjust the rear roller (one on each side of the unit in the back). Run the unit at about 3 mph. Tighten the bolts a 1/4 turn at a time. Make sure that what you do to one side, you MUST do to the other side or the belt will get off center. After you tighten it 1/4 turn, check the belt to see if it is still slipping. If it is then tighten the belt 1/4 turn again. Continue until the belt does not slip, but do not tighten the bolts more than 2 full turns. If it takes more than 2 turns then something else is the problem. The second problem that it could be is the drive belt might be loose. To tighten the drive belt, start by removing the front cover. loosen the bolts around the motor then tighten the drive belt by tightening the motor adjuster bolt. Once the drive belt is tight, tighten the motor back down. The third problem that it could be is the walking belt could be worn and need to be replaced. Let me know if you have any questions.

Posted on Apr 30, 2010

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