Start With What You're Actually Building
I review load charts. That's the short version. More specifically, I'm the quality and brand compliance manager at a construction equipment distributor—we move about 140 crane units a year, and every single load chart PDF, spec sheet, and delivery inspection sheet passes my desk before it reaches a customer.
What I don't do: concrete drill bits, drill presses, or can crushers. If those are on your list, you're reading the wrong article. I mention this because people assume anyone in "construction equipment" covers everything. Not even close. Last spring a buyer asked me to "just quickly vet" a pallet of concrete drill bit sets because he figured it was adjacent to our business. It's not. I sent him to a specialist and that's exactly what I'd do again.
My lane is tower cranes—specifically the Potain range, which is what I know inside and out. The most common question I get: "Which model should we go with?"
There's no single answer. The right crane depends on your site, your building height, and how long the crane will sit there. So let me break this into the three scenarios I see most often.
Scenario A: Low-Rise Residential or Light Commercial (1–4 Stories)
If you're building townhouses, low-rise apartments, or a strip mall, the self-erecting option usually wins. For Potain, that means the Igo family of self-erecting cranes—or similar models in the lineup.
Here's what matters from a quality standpoint:
- Setup time. A self-erecting crane goes up faster because it folds and unfolds itself. No specialized climbing crew. That's the whole point.
- Load chart simplicity. The load chart PDF for a self-erecting unit is typically shorter than a top-slewing chart. Not simpler in meaning—just fewer pages. Capacity drops faster at the jib tip than most people expect on their first read.
- Transport. One truck, one trailer. That's the dealbreaker for tight sites.
I've rejected load chart sets where the chart didn't match the delivered configuration—customer received a crane with a different jib length than the chart specified. That's the kind of issue that halts a job on day one. With a self-erecting unit, verify jib length and counterweight configuration against the serial number before you sign anything.
I don't have hard data on self-erecting adoption rates by region—not something we track internally. Based on our order book, self-erectors dominate suburban residential work. That said, I can only speak to what we see. If you're in a dense urban center, scenario B is more likely your lane.
Scenario B: Mid-Rise Commercial or Mixed-Use (5–15 Stories)
This is where top-slewing cranes take over. Think MDT series for Potain—hammerhead configuration, fixed jib, standard for mid-rise. The load chart becomes the document you live and die by.
Let me be direct about load charts, since "Potain tower crane load chart PDF" is something people search for and then misuse. A load chart isn't a single number. It's a curve mapping jib radius against capacity. At 20 meters out, you can pick up X. At 40 meters, you can pick up maybe half that. The curve isn't linear, and the penalty for reading it wrong is a dropped load or a tipped crane.
I've seen lift plans that called for a load at 35 meters based on the chart's 20-meter capacity. That's not a rounding error. That's a safety violation.
When you download a load chart PDF, check three things:
- Configuration match. Does the chart reflect the exact jib length, counterweight, and base configuration of your delivered unit?
- Revision date. Manufacturers update charts. An outdated PDF might reflect older rigging loads or superseded limits.
- Out-of-service conditions. Wind speed thresholds, out-of-level limits, and reeving requirements are often on a separate page from the main chart. Miss them and the whole document is useless.
I ran a quiet comparison last year: two load chart PDFs from different manufacturers, same crane class, same nominal capacity. One was four pages with clear radius-capacity tables. The other was two pages with a single curve graph that required interpolation. Our operators preferred the four-page version by a wide margin—not because it was more accurate, but because they could read it at a glance on site. Neither chart was wrong. One was just harder to use.
For mid-rise work, top-slewing is almost always the right call. But before you settle on the MDT, ask yourself how long the crane will be on site. If it's under six months and the building is under eight stories, a self-erector might still work—and you'll skip the climbing crew and the foundation engineering.
Scenario C: High-Rise with Tight Site Constraints
Dense urban sites, tall buildings, overhead obstructions. This is luffing jib territory. Potain's MR series is the reference point.
What changes with luffing: the load chart gets more complicated. The jib angle affects capacity, so you're reading a multi-variable chart rather than a single radius-capacity curve. If your operator isn't experienced with luffing configurations, the chart is easy to misread.
The quality issue I run into most: luffing load charts sometimes arrive in a format that doesn't clearly separate in-service and out-of-service wind limits. I've flagged this on incoming documentation before—the chart was technically correct but the presentation made the wind threshold easy to miss. We asked for a reissued version with clearer formatting. They provided it. Not a product defect. A documentation defect. Still matters.
One thing I can't help with: if you're deciding between a luffing crane and a site crane for a project with overhead power lines, that's a conversation for the applications engineer. My job is verifying that the documentation matches the machine. The engineering tie-in is outside my boundary.
How to Decide Which Scenario You're In
Here's the short version, based on what I actually see across our order book:
- Under 4 stories, limited site access, short schedule: Self-erecting. Don't overcomplicate it.
- 5–15 stories, standard site, 6–18 month timeline: Top-slewing. Load chart discipline is your main job.
- 16+ stories, constrained site, overhead obstacles: Luffing. Accept that the chart is harder to read and budget for training.
And if none of those describe your project—if you're doing industrial work with irregular loads, or you're on a site with multiple cranes sharing airspace—then you're outside the standard three scenarios. That's when you call the manufacturer's applications engineer. Not a load chart PDF. Not me.
The vendor who said "this isn't our strength—here's who does it better" earned my trust for everything else. So I'll do the same: if you need a concrete drill bit, a drill press, or a can crusher, find a specialist. That's their lane. Load charts and Potain tower crane configurations? That's mine.