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Remember when you could just listen to the motor? Had a governor rope jump the sheave in a 1970s Otis traction unit in an old bank building downtown. No fault codes, just a weird hum and a car that wouldn't level right. Took me half a day with a stethoscope and a mirror to find it.
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diana_murphy5mo ago
Totally get that! I keep a mechanic's stethoscope in my kit for this exact reason. Sometimes you just have to shut off the controller and listen to the raw machine. A weird hum or click tells you more than a dozen fault codes. It saved me last month on a hydraulic unit with a slow leak the sensors missed. Never underestimate the basics.
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willowh205mo ago
Exactly, the basics. I had a pump last year that passed every system check but just sounded...off. Like a faint metal-on-metal sigh. Threw a stethoscope on it and found a bearing starting to eat itself. The computer would have let it run until it blew. Now I do a sound check on every machine before I even look at the screen.
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hannahsingh5mo ago
Used to think all that old school troubleshooting was just wasted time. Then a weird vibration in a gearbox had me chasing ghosts for a day because the computer said everything was fine. Finally found a cracked weld the old guys would have spotted in ten minutes by ear. Makes you respect the simple tools.
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