c/elevator-mechanics

An old timer in a Chicago parts house once told me, 'Kid, you can't rush a good hoistway survey. The building will tell you what it needs if you listen.'

Had to choose between a new hoistway door lock or a full rebuild on a 1987 Otis unit in a Cincinnati office building.

That week we had three callbacks for the same 'sticky door' issue in the new Riverfront apartments

I mean, everyone on the crew kept saying it was a simple track alignment thing, but after the third trip I finally checked the door operator's control board. It was getting a weird voltage drop from a shared circuit with the hallway lights, causing the motor to hesitate. We had to run a dedicated line, which took a whole day. Has anyone else seen a power issue mimic a mechanical fault like that?

PSA: Tried a new grease on the old Otis traction machine at the Miller Building

Honestly, I was working on that 1968 Otis traction unit last month, the one with the original bronze bearings. The old guy who used to service it swore by this thick, black moly grease that's basically tar. I figured I'd try this newer synthetic high temp stuff from the supply house, said it was better for older systems. Ngl, it was a mistake. After about three weeks, the motor started running hot and we got a call about a burning smell in the machine room. Turns out the new grease was too thin, it just pumped right out of the bearings under load. Learned that sometimes the old ways exist for a reason, especially with that vintage iron. Had to flush the whole thing and go back to the heavy stuff. Anyone else run into problems trying to 'upgrade' the lubricant on an older unit?

Just read that the first elevator safety brake was invented because the guy who made it saw a rope snap at a mine

Found it in a history book at the library, and it made me picture him just staring at a frayed cable and having a lightbulb moment. Anyone know if that's the real story or just a good legend?

The way some guys set up a 5/8 inch sheave on a 1990s Dover traction machine is just wrong

I keep seeing them mount it with the flat side facing the wrong way, which throws off the rope line. It matters because it causes uneven wear on the grooves after about six months. I learned this the hard way on a job in Cincinnati where we had to re-rope the whole thing. Anyone else run into this specific setup problem?

I finally gave in and bought that fancy digital tension gauge for $350

Used it on a job in Phoenix last week and it gave me three different readings on the same cable. My old manual gauge was right the whole time. Anyone know a good brand that actually works?

The difference between a cheap knockoff and a real Schindler door operator is a whole weekend

We had a call for a sticking door on a 90s Schindler 330A. The building manager bought a generic operator online to save maybe 200 bucks. Spent all Saturday fighting it, the gear mesh was off and the cam follower was binding. Monday morning I put in the proper Schindler part and it was running smooth in under an hour. Has anyone else had a generic part eat up more time than it was ever worth?

Had to choose between a full machine room overhaul or a controller swap on a 1980s Otis unit

This was at a small office building in Tacoma. The old relay logic panel was failing hard, causing random floor calls. The building owner gave me two paths: replace the whole machine room setup for about $25,000, or just swap the controller to a new solid-state one for around $8,000. I went with the controller swap. It took me and my apprentice three days to pull the old relays and wire in the new unit. The tricky part was mapping the old safety chain, but we got it. The car runs smooth now, but I'm watching the old motor and sheave closely. Has anyone else done just a controller swap on an old system and had the drive train hold up okay for a few more years?

Just read an old Otis manual that changed how I look at governor ropes

I was cleaning out a supply room at a hospital job in Tacoma and found a 1972 service bulletin. It said a worn governor rope can lose up to 40% of its strength before it looks bad to the eye. I always did a visual check, but now I'm using my tension gauge every single time. Has anyone else found a rule of thumb that's totally different from what you were taught?

Update: A stuck elevator in the old courthouse taught me to always check the pit sump pump first.

Got a call for a total shutdown at the historic building downtown, and I spent two hours checking everything from the controller to the door locks. Turns out the pit was flooded from a broken pipe, and the float switch was just jammed with a plastic bag. Anyone else run into weird stuff clogging those switches?

I thought the new Schindler 3300 controller was just a gimmick until last Tuesday

We had a unit at the Grandview Medical Center acting up, and the old diagnostic method was taking forever. A guy from the local supply house told me to just plug my laptop into the new service port and run their software, which I thought was a waste of time. It pinpointed a failing power supply board in about five minutes, saving me two hours of chasing wires. Has anyone else had a tool or method they doubted that actually worked out?

My service log hit 5000 hours on the same Otis unit I started on

I mean, I was just doing a routine check on this old Miconic V panel downtown and the counter rolled over. It kinda hit me that I've been keeping this one elevator going for almost three years now. Do you guys ever get attached to a particular machine you've worked on for a long time?

Pro tip: For a stubborn door lock actuator on a 90s Otis Gen2, a quick tap with a deadblow hammer while the power is cycled got it to re-seat perfectly after three failed attempts with the service tool.

Has anyone else found a physical shock works better than the book procedure on those old units?

Cleaned my 500th elevator pit today and it hit me

I was finishing up a job at the old First National building downtown, vacuuming out the usual dust and pennies. When I logged it in my book, the count was exactly 500. It's wild to think about all the weird stuff I've seen down there over the years, from lost tools to a whole nest of wiring someone just left. What's the strangest thing you've ever found in a pit?

Shoutout to the crew that helped me with a stuck governor in Cincinnati last month

We were on a 15-story traction job and the governor rope just wouldn't seat right. Their lead guy, Mike, spotted a tiny burr on the sheave groove I'd missed. Anyone run into something similar on a newer Montgomery unit?

Just realized a bad door operator sensor in a 90s Otis unit can eat up a whole Tuesday

I spent 6 hours chasing a phantom 'door open' fault in a 1994 Otis Gen2, only to find the sensor was just dirty, but my partner says we should have just swapped the whole operator first and saved the time.

My brother-in-law who works on cranes said elevator safety codes are too strict and slow down work, and I actually thought about it for a week.

I just read that the first elevator safety brake was tested in 1854 by jumping on a rope

I was looking up some history on the Otis company for a training thing at work and found this old article. It said Elisha Otis did a public demo in New York where he had an elevator platform hoisted up, then cut the rope holding it. The safety brake he invented caught it right away. The crazy part is, the article said he stood on the platform himself while his assistant cut the rope with an axe. I always figured they used a sandbag or something for the first test, not the actual inventor. It makes you think about how sure he was in his own work. I've trusted those brakes every day for years, but knowing the guy who made them was willing to bet his life on the first real test is something else. Has anyone else come across a piece of elevator history that made you pause like that?

Spent 3 hours chasing a phantom door lock fault on a 10-year-old Schindler 3300

The car kept faulting on door close, but the lock roller and cam looked fine. Turns out the lock cam bracket had worn just enough to let the whole assembly shift about 2mm on its mount, which the switch couldn't track. Has anyone else seen this kind of wear pattern on the older 3300s, or was this a one-off?

Had a beer with a retired Otis guy from the 80s who said we used to fix things, now we just replace boards.

He pointed at my new diagnostic laptop and asked if I could still read a schematic. Ever feel like the trade is getting too far from the steel?

PSA: A janitor in a Miami high-rise just gave me a new view on door zone safety

He said, 'You guys always look up, but I've seen three people trip on that sill plate because they were staring at the overhead.' Now I check the floor first on every call. Anyone else have a non-mechanic point out a blind spot like that?

PSA: My old way of checking door hanger rollers was costing me hours

For years, I'd just give them a wiggle and a visual check, but I kept getting callbacks for noise on the same units. Last month on a job at the old Granville Hotel, my partner showed me his trick: he uses a dial indicator to measure the vertical play. Found one roller with 0.08 inches of slop I'd have totally missed. How do you guys check them to be sure?

I finally got the old Otis hydro in the 1970s apartment building on Elm Street running smooth after three weeks of chasing a gremlin.

Turns out the bypass valve had a tiny piece of gasket stuck in it from a repair job last month. Anyone else ever have a valve issue mimic a pump problem?

Had a hoist rope jump its sheave groove on a 10-story job last Tuesday

I was doing a full rope change on a traction unit in an old office building downtown. We had the new ropes run and were starting to tension them when I heard this loud metallic CLANG from the overhead. One of the ropes had popped out of the machine sheave groove because the deflector sheave alignment was off by maybe an eighth of an inch. My partner killed power right away. We had to re-seat it by hand, which took two of us pushing with pry bars for almost an hour in that tight machine room. Checked every other sheave with a straight edge after that. Has anyone else run into this from a worn deflector bearing letting things shift?