c/elevator-mechanics

The day we had to scrap a full door operator because of one little relay

I used to think I could fix any old Otis door operator with just a multimeter and patience. Last Tuesday at the 34th Street building, I spent 6 hours tracing wires on a model 7A before realizing the main control board was beyond repair. We ended up having to pull the whole unit and install a replacement from the warehouse, a $2,800 job that could have been avoided if I had just checked the serial number first. Has anyone else run into these old units where the parts just aren't worth saving anymore?

Pro tip: a shop vac fixed my stuck elevator door lock in 5 minutes

I was on a service call downtown last Tuesday and this Otis door lock was binding up real bad. I spent 20 minutes trying to clean it with a rag and some spray lube but nothing worked. Out of frustration I hit it with the shop vac to pull out the gunk and a bunch of metal shavings came out. After that the lock clicked smooth as butter. Has anyone else had luck using a vac for cleaning instead of the usual solvents?

Got a request to retrofit an old Otis unit from 1962 last week

The owner wants modern safety sensors but wants to keep the original brass fixtures and hand-cranked gate operation, has anyone else had to deal with mixing 60-year-old parts with new code requirements?

Warning: Never trust a 30-year-old hydraulic line just because it looks dry

I was doing a routine service on a 1987 Otis at a bank in downtown Nashville when a packed line burst right next to my face. Oil sprayed everywhere and I had to spend 4 hours cleaning the pit before I could even start the real repair. Has anyone else had a near-miss from aging equipment that looked fine at a glance?

I finally switched from wire rope to poly rope for hoistway safeties

Back in 2018 I was still using standard 3/8 wire rope for all my hoistway safety cable runs, you know, the old way. Then I got a call from a building manager in Cincinnati who said the wire had frayed and damaged a guide rail bracket after only 4 years. My mentor, a guy named Frank who's been in the trade since the 70s, told me to try polyethylene rope instead. He said it doesn't rust or fray the same way, and it's way easier to handle in tight spaces like that 12 inch gap between the car and the pit floor. I swapped over on my next job at a 6 story apartment complex last spring, and the install went so much smoother - no kinking, no sharp edges to deal with. Has anyone else made the switch and noticed a difference in longevity? I'm curious if poly holds up as well in wet conditions long term.

Had to hot-wire an old Otis controller in a Denver hotel basement last Tuesday

The fire alarm system took out the main power and I spent 45 minutes tracing a short in the emergency stop circuit, so now I always carry a spare relay board just for those old DC units, has anyone else dealt with this mess in pre-1980s elevators?

Old timer told me to stop using WD-40 on door tracks

Guy named Frank from Local 3 in Chicago said use dry silicone spray instead. Ignored him for two years. Finally tried it and now my doors slide smoother than ever. Anyone else had a senior guy tell you something obvious that actually worked?

Just realized my partner's dad had a point about these old Otis machines

I was at a family dinner last week and my girlfriend's dad, retired mechanic from Chicago, told me I rely too much on the diagnostic boards and should learn the relay logic by heart. He said nobody under 40 can trace a stuck contactor anymore without a screen. Do you think we've gone too digital, or is this just old timers gatekeeping the trade?

Plugged a leaky hydraulic line with a bar of soap and it held for 3 months

Had to pick between two used elevator controllers last week

One was a 2005 Otis with a known glitch on the third floor, the other was a 2008 Kone that had fresh contacts but no service history. Went with the Kone and so far she's running smooth, anyone else gamble on used controllers?

PSA: I spent 5 years leveling elevators wrong in Denver

I always adjusted the floor stops by ear until a mechanic from Otis told me to actually check the sill gap with a feeler gauge. Found out my cars were sitting 1/8 inch off on half my jobs. Has anyone else had a basic habit they discovered was totally off from a random coworker?

Old timer at the union hall told me to stop greasing guide rails by eye and actually measure the film thickness

After getting a callback on a job in downtown Boston where the car was chattering on every floor, I picked up a $40 ultrasonic thickness gauge and found out I was putting on nearly triple the grease I needed, anyone else been running blind on their rail lubrication?

Debated between oiling the rails dry or wet last night

Went with wet oil on that MCE controller and now I've got a sticky governor that's tripping false stops. Am I the only one who regrets trusting the can instead of wiping it down first?

Used to follow OEM manuals to the letter, now I just adapt on the fly

Honestly, for the first 8 years in the trade I wouldn't touch a single adjustment without the MCE or GAL book open. Then last year a senior mechanic in Denver told me to just feel the door tension and set the limit switches by ear. Tbh I thought he was full of it until I tried it on a Schindler 330A and it ran smoother than ever. Ngl I still check the manual for anything code related, but for basic tuning I trust my hands way more now. Anyone else ever ignore the book and just go with what works?

Just wasted 6 hours on a door interlock that was off by 1/8th of an inch

I was working on an Otis elevator in a 12-story building downtown last Wednesday. The door interlock kept tripping the safety circuit every third or fourth cycle. I swapped relays, checked wiring, even replaced the contact block and it still acted up. Turns out the door hanger was slightly bent from a previous repair, just enough to throw the alignment off. Has anyone else spent way too long on stuff like this before catching the simple fix?

Found out the average elevator is inspected less than once a year in 12 states

Old timer at the supply house told me to stop relying on factory wiring diagrams

I was wiring up a new MRL machine room less setup last week in a mid-rise in Austin and hit a snag with the controller. A guy named Tom who's been doing this since the 70s told me to ditch the factory diagram and trace it myself because they get updated but the prints don't always match. He was right about the encoder feedback loop being swapped on the print vs real world. Anyone else run into mislabeled diagrams on newer Otis or Schindler stuff?

Walked past a dumbwaiter in a 1920s building downtown and noticed the cable sheave was half the size of a modern one

The old one ran smooth as silk on a 4 inch sheave with steel cables while we use 8 inch ones now for basically the same weight, has anyone else seen older gear that just works better with simpler parts?

This one thing newer mechanics keep getting wrong about leveling switches

I've been doing this for about 22 years now, and I keep seeing guys under 5 years in the trade messing up door zone bypass adjustments. They treat the leveling switch like it's a simple on/off deal, but in my experience those old Otis switches from the 90s need a specific gap tolerance down to like 1/16th of an inch. I watched a kid last month in Pittsburgh spend 3 hours chasing a ghost fault because he had the switch too tight against the cam. The car was hunting for level every stop. His senior mechanic finally came over and just loosened the bracket 3 turns and it ran perfect. Why do they always think tighter is better? Has anyone else noticed this trend with the younger guys coming in?

Debate: did controller retrofits actually improve ride quality or just add complexity?

Back in 2012 I worked on a 1992 Otis that still had the original relay logic. Smooth as glass, never a complaint. Then last month I serviced the same model after a Motion 4000 retrofit. It stops fine but there's this little jerk at floor level that wasn't there before. My partner says it's just a gain setting, but I've tweaked everything I can think of. Has anyone else noticed a difference in ride quality before and after a controller swap on hydraulic elevators?

Appreciation post: the old timer who taught me how to read a relay ladder

Back when I started out 8 years ago in Detroit, an older mechanic named Frank took me under his wing. He spent a whole afternoon showing me how to trace a stuck relay on a Mowery freight car. He said 'son, if you can read this diagram you can fix anything with wires.' It stuck with me because he was patient and didn't make me feel dumb for asking questions. I still use that same method on every hydraulic controller I work on. Have any of you had a mentor who really shaped how you approach the job?

Rant: That old timer who said 'never trust a 10-year-old governor cable' was dead right

Last Tuesday in Phoenix, I ignored his advice and swapped in a used cable off a junker Otis, and the car dropped three feet during a test run before the safety caught it.

Old timer at the union hall gave me a tip about brake shoes that was dead wrong

Back in 2018, a guy with 30 years in told me to always grease the guide rails on hydraulic elevators, but I found out the hard way that just makes the safeties slip. Has anyone else had an old-timer's advice backfire on a job?

That old timer in Chicago told me to always double check the governor

Back in 2019 an elevator mechanic named Frank pulled me aside after I finished a governor test and said my tension sheave was off by a hair. I shrugged it off until three months later that car oversped during a load test and the safeties barely caught. Has anyone else had a seasoned guy point out something that saved your license down the road?

Heads up about those cheap limit switch replacements from Amazon

I grabbed a pack of 10 for $22 off Amazon last month to keep on the truck. Installed one at the Maplewood Towers in St. Louis on Tuesday and it failed by Friday - car was stuck between floors with the doors open. Has anyone else had these knockoffs crap out way faster than OEM parts?