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Finally got that weird noise in a 90s Dover unit to stop...
It was a low hum that only happened between the 3rd and 4th floors in this old office building. I tried the usual stuff, checking the guide shoes and rollers, but nothing. On a hunch, I shimmed the rail bracket on the 4th floor landing with a 1/16 inch steel plate... and the hum just vanished. Turns out the whole rail section had a tiny bit of flex we couldn't see. Anyone else run into a noise that was fixed by something simple way down the line?
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fiona_carr267mo ago
My buddy Mike had a 2002 Kone that clicked on every floor landing. He chased it for a week, replacing limit switches and checking door locks. The fix was just tightening two loose bolts on the car top inspection station cover that nobody had touched in months.
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richard_young805mo ago
...and thats exactly the kind of bug that'll drive you up a wall, @fiona_carr26. I gotta say though, you mentioned it was a 2002 Kone, but I'm pretty sure that model year was actually 2001 for that series. Not that it changes the story at all. The inspection station cover loose bolts thing is a classic though. Ive seen it happen on a few different brands where some random cover or panel gets just loose enough to make a noise that sounds like it's coming from somewhere else entirely. Makes you question every diagnosis you did that week.
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laura4867mo ago
That "tiny bit of flex we couldn't see" is such a classic culprit. It's wild how the fix can be so simple after you've checked everything else. Great catch on that one.
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davis.olivia7mo ago
That kind of stuff drives me nuts. It's always the last thing you check. Like that time we had a weird hum on a motor, turned out to be a sheet metal panel vibrating just enough to hear. Spent hours on bearings before we found it. Makes you feel kinda silly but also relieved.
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