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Why is my treadmill making a loud whining noise?

I have a Keys 980S Treadmill that was purchased from Sears in 2001. It had moderate to low use over the years, but in the last year it was not used. We had a Sears repairman come out on 12/28/10 because it was making a loud, whining sound when we were on it. He said it might be the motor (2.5 HP or 1/50 CHP) and if so, he thought that motor was discontinued. He lubricated the old motor and it seemed to sound much better, but when we went on it the next day, it still was making the noise. Keys has apparently gone out of business, and Sears parts says they do not have a replacement motor. But the machine works fine except for this annoying noise, so is there any other issue that could be causing it? I am thinking the belt that seems to turn the motor. When I ran the machine with the motor cover off, it seemed to be somewhat better.

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3 Answers from these members:
Manage My Life
This may or may not help but I was having the same problem with my treadmill. I lubricated the belt, vacuumed everything I could see without any result. However, I noticed that the treadmill which was on a rubber mat had made an indentation in the mat and on closer examination had lost a rear wheel??. I moved the treadmill over on the mat so it didn't rest so low and replaced the plastic thing on the wheel and now everything is working very well and it didn't even cost me a service call. I'm hoping this can help someone else
by Manage My Life
May 20th, 2011
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Manage My Life
The noise could be a roller bearing going out. If you have the machine off and just walk on it can you still hear the noise? The walking belt could be making noise against the platform; you can lube the walking belt with belt lube for that. Again, walk on it with the machine off to see if you still hear the noise. The drive belt could be making some noise, but that's really uncommon and I highly doubt that to be the case.

For what it's worth, there are some companies online that carry aftermarket replacement motors for some of these machines; it would be worth it to check around if you do end up having to replace the motor.

Thank you for using Manage My Life!
by Manage My Life
January 17th, 2011
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Manage My Life
While you are waiting on an expert to answer your question, a suggestion I have is to add model number to this thread so you can get a better answer from the experts!
by Manage My Life
January 15th, 2011
Answered in 13 minutes
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