If you're ordering Potain crane parts for an MCT 85 tower crane, the most important thing I've learned is this: never trust the model name alone—verify the serial number and revision code before you pay. I skipped that check on a 14-piece order in 2021, and it cost about $12,400 plus a 3-day crew delay. Not a theory. Just my invoice history.
I'm not a crane engineer. I'm a procurement coordinator who's handled Potain parts orders for six years. I've personally made—and documented—14 significant mistakes that added up to roughly $68,000 in wasted budget. After the third rejection in Q1 2024, I built the pre-check list our team still uses. This is the honest version of that list.
Everyone told me to check serial numbers before approving parts. I only believed it after I ignored it once and paid the price. That's the whole story in a paragraph.
Why this matters more than you think: A crane part that "almost fits" isn't a part. It's a liability. The difference between the right MCT 85 mast section and the wrong one often comes down to a letter after the part number. When you're dealing with a $80,000 crane or a $500,000 rental fleet, that letter is the difference between a productive week and a safety incident.
In my first year (2019), I ordered the wrong jib pins for an MR 415 because I downloaded a stale PDF and didn't check the drawing revision. In September 2022, I approved a hoist drum that didn't match the MCT 85's rope diameter—$8,900 down a hole. In 2023, I want to say we spent $47,000 on Potain parts, but don't quote me on that; our ERP was messy. Since the Q1 2024 checklist, we've caught 47 potential errors before they became bills.
I should add that we'd been with the same dealer for four years when the hoist drum mistake happened. It didn't matter. The dealer doesn't know your crane better than you do.
The mistakes that hurt
1. Trusting the model name alone
The Potain MCT 85 is not one machine. It has different jib options, mast section types, and serial-number breaks. I learned this when I ordered an "MCT 85" luffing pulley assembly and discovered the actual crane had the optional high-capacity jib configuration. The part number looked right. The serial number said otherwise.
That was also the first time I realized "Potain MCT 85 tower crane" is a search term, not a part specification. You can type it into a parts site and get a result, but the result only means something if you've verified the machine's exact configuration.
2. Skipping the revision letter check
Potain supersedes parts with improved revisions. Part number 123456A gets replaced by 123456B. If you're buying from a dealer, the B version is usually what you want—but some early machines still need the A version. I said "just send me the latest version." They heard "send the one that fits the crane I mentioned last time." The mismatch didn't surface until the crew was standing next to an open toolbox. That was a communication failure, not a part failure.
Now I ask one question on every quote: "Is this the current part number for serial number range [X]–[Y]?" If the answer doesn't contain a serial range, I don't approve it.
3. Using a power drill to force pins
You can spend an hour with a sledgehammer and still not move a mast pin that's been seated for two years. But don't reach for a power drill to speed it up. I watched a maintenance guy spin a pin collar and ruin the bore. The correct approach is a proper pin puller, a brass drift, and penetrating fluid—not a power drill. That lesson came with a $3,100 repair bill.
This isn't in the parts manual, by the way. It's in the "common sense" section that nobody writes down. If someone on your crew says "let's just zip it out with a drill," that's your cue to stop the work and find the right tool.
4. Stocking parts for the wrong configuration
Conventional wisdom says you should stock critical spare parts for a Potain MCT 85. That works if you're stocking the right parts. In practice, stocking the wrong parts is worse than not stocking any because it gives you false security. We once had a box of sliders and bumper stops that didn't fit any crane in our fleet. They sat on a shelf for two years while the part we actually needed was on backorder for four weeks.
I knew I should test-fit a slew bearing before sending the whole order to the site, but I thought "what are the odds?" The odds caught up with me when the bolt hole pattern didn't match the undercarriage. That was a $6,300 freight and restocking mistake. Skipped the test fit because it "never mattered." That was the one time it mattered.
5. Not photographing the data plate
Every wrong part I've received traces back to someone reading a faded sticker and guessing the serial number. On the MCT 85, the serial number plate is on the tower base, under the access ladder. Take a photo with your phone and attach it to the email. It takes ten seconds and removes 80% of the guesswork.
One more detail: photograph the load chart too. The chart has the configuration details, rope falls, and counterweight settings. It's the second most useful identifier after the serial plate.
6. Ignoring the load chart when ordering wire rope
I once ordered replacement hoist rope based on the diameter stamped on the old drum. I didn't check the load chart for the MCT 85 configuration. The rope was the right diameter but the wrong construction class, so it didn't spool properly. That was the $8,900 mistake. I still kick myself for not asking for a serial number range in writing. If I had, we'd have caught the hoist drum issue before it was on a truck.
7. Buying aftermarket for the wrong components
Everything I'd read about crane parts said to buy aftermarket to save money. In practice, for the main hoist and load-bearing components, OEM Potain parts from a factory-trained dealer got us less downtime and, more importantly, a paper trail. The aftermarket part looked identical but didn't come with traceable certification. Someone once warned me about that. I didn't listen. The "cheap" part ended up costing 30% more because our insurance flagged it and we had to replace it with the OEM version anyway.
I still use aftermarket for wear items like plastic caps or trim pieces. But anything in the load path, I won't risk it.
The checklist I use now
- Photograph the serial number plate. Save it in the asset file, not just in your phone.
- Write down the exact config. Include any optional or high-capacity variations.
- Ask in writing: "Will this part fit serial number range X–Y?"
- Compare part numbers. Drawing part number vs. quote part number. This catches most revision errors.
- Request certification for load-bearing parts. Get it at the quote stage, not delivery.
- Check lead time before approving. Easier to change part numbers before there's a restocking term.
At least, that's been my experience with the MCT 85s we run. If you're running a fleet of 30 cranes, your stock strategy will be different.
A note for anyone who got here by accident
This article is about Potain crane parts and the Potain MCT 85 tower crane. It is not about how to use a power drill, it's not about the crane fly buzzing near your porch light, and it's definitely not about who is Crane on Masked Singer. If you clicked one of those terms, this isn't the answer. But if you've ever ordered a crane part without confirming the serial number, you're in the right place.
Where my advice falls short
This is one person's procurement experience, not official Potain documentation. My company runs a small fleet, not a nationwide rental operation. Manufacturers change part numbers and documentation, so always verify current information with a factory-trained dealer. According to OSHA's construction standard for tower cranes (29 CFR 1926.1435 at osha.gov), assembly and disassembly must follow the manufacturer's instructions and specifications—so if there's ever a conflict between this article and the manual, believe the manual.
And if you're reading this while staring at a Potain MCT 85 with a part in your hand that doesn't fit, stop reading. Get the serial number, email the photo to your dealer, and ask the question I didn't ask. That's the entire checklist in one sentence.
