Makes a loud rubbing noise on one side
To be honest with you, these could be symptoms of a few different problems. Here are the most common ones and what it possibly sounds like:
1) It could be that the front roller has dislodged itself from the roller pulley. In other words, the motor keeps turning, and when you step on the walk belt, the pulley (the one with the small rubber belt) keeps turning, but the roller stops. This can cause grinding noises, and the pulley to "skid" the black belt, which can account for the black dust. You can usually tell this is the problem when it runs fine with nobody on it, but when you step on it, it grinds
2) It could also be that the walk belt is rubbing on the sides of the deck and/or side rails. This happens when the belt shifts over from the center. It would definitely sound like a grinding noise, and the black dust could be from the walk belt particles wearing down due to the rubbing.
3) It could also be the drive motor brushes. Let me explain. The motor has two small blocks on either side of it (inside the metal casing). Those two blocks actually carry electricity into the spinning part of the motor (called an armature). They actually make contact with the armature at all times while it spins. Those "small blocks" are made of a graphite (what pencil lead is made of). Well, with so much spinning, and so much contact from the armature, those things grind down with time. They sometimes grind down until they are stubs only. Then they start grinding. The powder in this case would be the brush graphite piling up (this would often be shiny dust, and is a dark grayish).
4) The grinding could also be roller bearings going bad.
**For #3, and 4 above, you have but to remove the small belt that attaches to the motor (rubber, black, and small attached to pulleys), and let the treadmill run for a few seconds by itself. You may get a "speed error code' after the treadmill does not detect speed, but at least you'll know if the grinding is coming from the motor. If it runs super quiet, even for a few seconds, then you know it may be #1, 2, or 4 above.
These are the most common issues based on your symptoms.
3/16/2014 6:38:38 AM •
on Mar 16, 2014