Treadmill Thumping Noise

Old 07-17-20, 11:15 AM
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Treadmill Thumping Noise

Ok so I recently obtained a Sportcraft TX300 treadmill (Model No. 04003). I think it was manufactured in 2007. Anyway, it runs fine with the exception of a loud thumping noise. I am pretty sure the sound is coming from the front panel. When I listen closely it doesn't seem to be from the motor, but rather from the right roller/bearing. I have lubricated the belt and adjusted the belt tension as well. I thought about lubricating the bearing, but I first want to be sure that's causing the noise. Wish I could attach the video so you can hear what I hear. It sounds like a loud thumping or door banging....It's pretty consistent and doesn't seem to matter the speed.
Old 07-17-20, 11:18 AM
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thumping noises are caused by a flat spot on roller or something stuck on belt or roller. Don't think lube will help. May need a new belt.
Old 07-17-20, 02:55 PM
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When running the treadmill and hearing the thumping noise it can help if you pay attention to the frequency of the thumping. Some of the little bits under the cover need to turn faster than the belt speed while others run at the same speed as the belt. The motor turns very fast and through a belt & some pulleys or a gearbox it's rotation is slowed down to that of the pulley driving the running belt.

If the frequency of the thump sound seems to occur closer to the speed of the belt then I'd focus my search on the belt and it's rollers. If the thumping sound seems to occur at a rate faster than the belt you should look further upstream towards the motor like drive pulleys & drive belt (the drive belt connecting the motor to the running belt roller).

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