I'll make the argument up front: the Potain tower crane MCT 85 load chart is the most important document we produce. Not the brochure. Not the website. The load chart. I'm a quality and brand compliance manager for a tower crane manufacturer, and I review every spec sheet, decal, and operator aid before it reaches customers—roughly 300 items a year. In 2025, I've already rejected over 7% of first submissions because of load radius errors, inconsistent unit conversions, or missing notes.
People assume that quality control is about paint and welds. It's probably because those are the visible things. But the less visible stuff is where trust is built or lost. From the outside, a load chart looks like any other table. The reality is that it's a promise about what a crane can do. That promise is the first thing I check.
A Load Chart Is a Safety Claim, Not a Specification Sheet
I learned this the hard way. In my first year in quality, I made the classic rookie mistake: I approved a load chart because the capacities matched the previous revision. I didn't read the notes. That revision was released for a reason—the maximum free-standing height had changed. The oversight caused a $22,000 rework and delayed a customer handover. I've never skipped the notes since.
The load chart condenses the crane's geometry into rows and columns: radius (meaning the horizontal distance from the center of rotation to the load hook), jib length, counterweight, and one number for capacity. There is no room for interpretation. Per FTC guidelines (ftc.gov), marketing claims must be truthful, not misleading, and substantiated. A load chart is the most literal version of that rule. It says, "At this radius, with this jib, this crane can lift this much." If any part of that is wrong, you're not just making a marketing mistake. You're defining a hazard as if it were a specification.
A load chart is no place for "approximately." The number a client checks is the number they build their lift plan around.
One concrete example: in Q1 2024, a print vendor sent us the MCT 85 chart with a 500 kg overstatement at the 24 m radius. The rest of the page looked perfect. The vendor said that the discrepancy was within industry standard. I rejected it. We made them reprint every sheet at their cost. Now every contract includes a line-by-line check against the engineering database.
Clients Judge Your Company by the Chart
Here is what might surprise you: the load chart is one of the most visible documents your customer ever sees. It sits on the table in a pre-job meeting, gets attached to a rental agreement, and is photographed for the site file. If it's a blurry scan or a dated layout, the message is that your operation tolerates sloppy documentation. And if your documentation is sloppy, what else is?
I once ran a blind test with our rental coordination team. Same MCT 85 data, two layouts. One was a clean chart generated from the engineering database. The other was a decent scan of an older version. 78% of the team said the clean version felt "more professional." The cost difference between those two files was almost nothing. On a busy rental fleet, that's one of the cheapest perception upgrades you can make.
So glad I started putting charts through the same approval process as marketing material. Almost didn't—I figured load data was "just technical." That would have been a bad call the first time a customer challenged our chart in a kickoff meeting.
The Stork vs. Crane Question Deserves a Serious Answer
I know "stork vs crane" sounds like a trivia question. To a birdwatcher, the answer is clean: different families, different behavior, different silhouettes. On a construction site, "crane" means the machine. But the same instinct to distinguish between similar things is exactly what a load chart does for an MCT 85.
At a distance, the MCT 85 might look like other top-slewing cranes. The chart is what tells you it's not. It defines the radii, jib configurations, and counterweight requirements that make the machine work. Names don't lift steel; rated capacities do. That's why the load chart matters more than brand reputation, more than paint color, and more than the story behind the machine.
This is also why phrases like "the Crewe tractor of tower cranes" or "the Westinghouse generator of the sky" make me cringe. A restored Crewe tractor has historical charm. A vintage Westinghouse generator can be an engineering masterpiece. But neither one gets a lift plan approved. The MCT 85 gets approved because its Potain tower crane load chart matches the site conditions. The rest is conversation, not engineering.
But What About Load Indicators?
I hear the objection: "Nowadays the crane's LMI (load moment indicator) does the math. Nobody reads the paper chart on site." That's true up to a point. The load moment indicator is a useful tool. But the LMI is programmed from the same table—and if the table is wrong, the LMI is wrong. You don't fix a bad source by adding a display. In my experience, the load chart becomes more important, not less, because it's the master reference for every digital system.
Also, load charts are used by more than operators. Site engineers use them to plan lifts. Rental coordinators use them to match a crane to a job. Insurers use them in incident reviews. The chart is a handshake between engineering and every other party involved.
The Bottom Line
The Potain MCT 85 is a hard-working machine. But the document that protects its reputation is the Potain tower crane load chart. A clean, accurate, current chart shows that someone is paying attention. An inaccurate one—or worse, a chart treated as an afterthought—signals the opposite.
I still believe some people in this industry think quality control means checking painted bolts and grease points. That's part of the job, but it's not the whole job. The first quality check, and the most public one, is the load chart.
So if you ask me what separates a professional crane operation from a mediocre one, I won't say horsepower or boom length. I'll ask to see the load chart. If it's right, everything else has a better chance of being right. That's not a guess. That's a quality decision.
