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So you've got gear noise. Annoying, right? Before tearing everything apart, I usually start with the simplest things. Is it constant,or does it change with speed/load? That can point you towards whether itS misalignment (which is a huge culprit for whirring noises),lack of lubrication,or something more serious like worn teeth. I've had a clicking sound that ended up being a small pebble stuck in the gear guard of an old lawnmower, and another that was simply a bolt that had vibrated loose and was causing excessive play.
What are some of the most misleading gear noise problems you've encountered? I'm always learning new things and would love too hear about some of the more obscure causes people have found, especially if they where tricky to diagnose. Did you use any specific tools or techniques (like using a mechanic's stethoscope) that proved especially helpful?