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What would cause my treadmill to speed up and slow down on its own?

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6ya6ya
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Posted on Jan 02, 2017

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  • 16 Answers

SOURCE: treadmill goes normal speed until I get on it and

When was the last time you placed the correct lubrication between the walk belt and the walk board. This is a very common issue. Make sure you DO NOT use anything from an aerosol can. The acetone will cause the belt to get dry, hard and crack.

Good luck.

Posted on Jun 29, 2009

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SOURCE: Treadmil stops or slows down upon walking.

Check both belts to be sure they are adjusted and not slipping.Check the underside of the walk belt to see if it feels frayed in the center as compared to the edges, the center always wears more than the edges a really worn belt must be replaced. if it is nor worn there is a wax lubricant for proform treadmills that can be purchased at retail stores that sell treadmills.Sears, dicks sporting goods and also treadmilldoctor.com are good places to buy it.

Posted on Aug 01, 2009

  • 13 Answers

SOURCE: Treadmill won't slow down

if you look at the front roller. there will be a black device that has two wires. this is your speed sensor. Make sure it is facing the magnet on the roller.

Posted on Aug 10, 2009

  • 1 Answer

SOURCE: treadmill belt runs very slow and stops when I get on

proform 625 belt slips cause

Posted on Jan 28, 2010

bwinton
  • 83 Answers

SOURCE: It will speed up and slow down

This is caused by one of four 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. The fourth problem is that the lower board either needs to be adjusted or is going bad, I cannot be for sure without knowing the brand and model. Let me know if you have any questions.

Posted on Apr 30, 2010

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