A bang noise
I have a Gold's Gym 430, only 6 months old and not used much. After I have been walking on it at 3 mph for about a minute -1.5, it makes a "bang" noise. Last time it was a double bang.
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Comments
You can remove the hood cover to expose the front roller ends and the side rails to expose the rear roller ends, then take your wd-40 with the spray straw and spray a little in each side when the noise begins.