The Cheap Used Demag Crane Won't Save You What You Think It Will

Last spring I built a spreadsheet with twelve used Demag AC100 cranes on it. All between 2015 and 2019 builds. All listed as "excellent working condition" with "full service history." Asking prices ranged from $385,000 to $542,000—a $157,000 spread on the same model, same brand, same lifting class.

I stared at that sheet for a while. The obvious move was the cheapest one. That's what most of my peers would've done, and honestly, that's what I would've done ten years ago.

I didn't do it. Here's why.
—and more importantly, here's what I started looking at instead.

The Surface Problem: Why Is There a 40% Price Spread on the Same Crane?

When you start sourcing demag cranes on the used market—especially something as widely deployed as the AC100—the first thing that hits you is the noise. Listings from Europe, listings from the Middle East, listings from brokers who've never actually seen the machine. Some sellers quote FOB. Some quote "as-inspected." Some quote numbers that don't include transport, customs, or any kind of post-sale support.

I've managed roughly $1.8M in capital equipment spending over the past six years, most of it in lifting gear. And I can tell you: the price gap isn't because one seller is naive and another is greedy. The gap is because they're selling different things and calling it the same thing.

Two identical-looking AC100s can be 18 months apart in maintenance philosophy, which on a 100-tonner means the difference between a crane that's ready for another decade and one that's two hydraulic seals away from a six-figure shop visit. The listing photo doesn't show that. The spec sheet definitely doesn't show that.

What the Sellers Aren't Saying Out Loud

Here's the thing I figured out after going through about 40 vendor conversations in one quarter: the used terrain crane market runs on informational asymmetry. The seller knows the machine's real history. You don't.

And that's where the actual cost lives.

"Certified" Doesn't Mean Inspected

Every second listing seems to say "fully certified" or "ready to work." What that usually means is the last certification was current when the machine was last operated. It doesn't mean the boom was NDT-tested last month. It doesn't mean the load moment limiter has been recalibrated. It doesn't mean the outrigger beams aren't developing hairline cracks you'd find on a proper inspection.

For reference: ASME B30.5 covers mobile and locomotive crane safety requirements, and it lays out exactly what a pre-operation and periodic inspection should include. When I ask a seller whether their crane's inspection matches B30.5 categories—and which category—the silence tells me a lot.

"Bulk Used Crane" Is a Category, Not a Description

This part took me longer to understand than it should have. When brokers advertise bulk used crane inventory—three, five, ten units at once—it's usually fleet liquidation. Mining companies, ports, big rental yards. And a liquidated fleet is not the same as a maintained fleet. It's a fleet someone decided wasn't worth maintaining anymore.

Doesn't mean every unit is a lemon. Does mean your due diligence has to be three times tighter, because the seller has zero incentive to flag which specific unit is the problem child.

Spare Parts Supply Is Where the Real Margin Hides

This is the one that changed how I buy. I now ask every terrain crane supplier the same question before I even discuss price:

"Who services this crane in our region, and where do the parts come from?"

Because here's what I learned after comparing our Q1 and Q3 maintenance spend last year, side by side—two cranes, similar hours, similar duty cycles. One had a local parts chain with genuine OEM components available at reasonable lead times. The other required ordering from Europe with 6–8 week windows and customs paperwork every time a seal failed.

Maintenance cost per operating hour: $14.20 versus $31.80. More than double. On the same lifting class.

That gap didn't show up in anybody's asking price. It showed up on our invoices for eighteen months.

The Cost of Getting It Wrong

In 2023 I made a decision that I still think about. We bought a used 90-tonner—not a Demag, and no, I'm not naming the seller—at about 22% below the next-closest quote. I felt great about it for exactly six weeks.

Then the boom telescoping cylinder started weeping. Then the LMI threw a fault code nobody local could clear. Then we discovered the previous owner had swapped in a non-OEM hydraulic pump, which meant the seal kit we'd ordered didn't fit and the OEM kit wasn't compatible with the modified housing.

Total unplanned spend in the first year: $47,300. Plus 11 days of downtime on a machine that was supposed to be our primary unit for a stadium project.

The "savings" from the cheaper purchase price: $38,000.

I have mixed feelings about how that turned out. On one hand, it was a genuinely stupid oversight on my part—we skipped the second inspection to lock in the price, and that's on me. On the other hand, that experience is why our procurement policy now includes a mandatory parts-availability audit before any used unit gets approved. That policy has since saved us from at least two similar situations.

What I Actually Look at in a Terrain Crane Supplier Now

If you're sourcing a Demag AC100 or anything in that class, the supplier evaluation matters more than the individual machine. Here's the short version of what I check:

• Parts supply chain. Can they name the actual part numbers for common wear items and give you lead times? If they can't answer in under a minute, they're brokering, not supplying.
• Inspection documentation. Ask for load test records, NDT reports on structural components, and a copy of the last LMI calibration. No documents, no deal.
• Service capability. Who's within 200 miles who can work on this specific model? If the answer is "you'll have to ship it," factor that in—it's not a discount, it's a deferred cost.
• Configuration history. Boom sections, counterweight setup, jib options. Mismatched configs are where the hidden incompatibilities live.
• Title and export status. Especially on cross-border deals. I've seen a clean-looking European unit turn into a paperwork nightmare at customs.

Notice what's not on the list: price. Price is the result of the other five, not the input.

The Short Version

The cheapest quote on a used crane is almost never the cheapest outcome. Not because sellers are dishonest—though some are—but because the numbers you're comparing aren't comparable. One reflects a machine. The other reflects a machine plus everything that keeps it working.

The 40% spread I saw on those twelve AC100s? That's not market inefficiency. That's the market pricing in exactly what you can't see.

Learn to read the invisible line items, and the buying decision gets a lot easier. Skip that step, and you'll pay for it either way—just not at the point of sale.