Nobody buys a crusher because they have too much time on their hands.

In my role coordinating emergency crushing and screening deployments for mining and aggregates clients, I've handled 200+ rush orders over 12 years. Everything from a quarry operator whose fixed plant blew a bearing on a Tuesday, to a contractor with 40,000 tons of material to process before a penalty clause kicked in. When someone calls me, the clock is already ticking.

And about once a week, somebody lands here after searching for "kleemann mercedes" or "simparica for dogs." Can't help with the first—we tune crushers, not cars. The second is flea medication for dogs, which is a different species entirely. But if you typed "Kleemann" or "what is drift" and crushing equipment is on your mind: you're in the right place.

Most questions I get boil down to one choice: mobile crushing or fixed plant? Not "which brand" or "which model." But whether to buy a mobile Kleemann unit or commit to a stationary installation. So let's compare them the way I actually do when triaging a rush order.

How I Compare: Four Criteria

When I'm triaging a rush order, I don't start with brochures. I start with four questions:

  • Lead time — how many days until the first ton of spec material rolls out?
  • Cost transparency — what's in the quote, and more importantly, what isn't?
  • Production drift — how long does the output stay on spec?
  • Exit cost — what does it cost to walk away when the project ends?

Here's how mobile and fixed stack up on each one.

1. Lead Time: Days vs. Months

In March 2024, a client called at 9 AM. Their stationary plant was down, they had 36 hours before a major infrastructure deadline, and the contract had a $50,000-per-day penalty clause. We had an MC 110(i) EVO2 jaw crusher on lowboys by 2 PM, and it was producing spec material at their site by the next morning. That's not a miracle. That's what mobile equipment does—it arrives complete, self-contained, and ready to run.

A fixed plant, by contrast, starts with a shopping list: geotechnical surveys, foundation design, rebar, concrete pours, structural steel, conveyors, electrical, permits, and a commissioning team. Realistic timeline: six to eighteen months. Even the "fast-track" pre-engineered fixed plants rarely crush their first ton in under four months.

Conclusion on lead time: if your deadline is measured in weeks, fixed isn't an option. Not "less ideal"—out of the race.

2. Cost Transparency: What the Quote Doesn't Tell You

This is where I've learned to be brutally honest. The sticker price on a fixed plant looks better. A lot better. But I've seen a $2.5 million fixed-plant quote turn into $3.8 million before the first ton of material ran through the crusher.

I once assumed a fixed-plant quote included foundation engineering. Didn't verify. Turned out each line item was priced separately—the foundation was another $400,000, and the site needed 14.5-meter piles because the geotech report showed weak bearing layers. That assumption cost the client three weeks and a serious budget overrun. Learned never to assume "complete" means complete when it comes to stationary installations.

A Kleemann mobile unit is different. The purchase price is higher, but it's a complete package: crusher, engine, conveyors, hydraulics, control system. Setup costs are visible and predictable—transport, cranage, commissioning. No mystery line items.

I've learned to ask "what's NOT included" before "what's the price." The supplier who puts all fees on the table—even when the total looks higher—usually costs less in the end. In my experience, fixed plants consistently have more not-included items. Mobile units don't.

Conclusion on cost transparency: if you can't get a full deployment cost in writing, that's a red flag. Mobile equipment is easier to price accurately because it travels with everything it needs.

3. What Is Drift? The Consistency Question

Clients ask me "what is drift?" more often than you'd think. In crushing, drift isn't about sliding around a corner in a car. It's the tendency of a plant's output to wander off spec as wear parts age, feed conditions change, or settings shift. A plant producing 95% passing 2-inch at 9 AM might be producing 88% passing by 3 PM. That's drift.

Conventional wisdom says fixed plants drift less because they're massive, rigid, and stable. There's truth in that for very high tonnages—when you're feeding 1,000 tons per hour from a permanent conveyor, you can lock parameters in a way a portable plant can't always match.

But here's what surprised me. Based on our internal data from 200+ rush jobs, modern Kleemann EVO2 machines held spec longer than we expected—even compared to stationary plants in similar applications. The continuous feed control system adjusts the feed rate automatically when the crusher starts working harder. It doesn't wait for an operator. It corrects in real time.

On short-duration projects—the kind I deal with every week—the EVO2 units actually drifted less than the fixed plants we were replacing.

Now, that's not a universal law. A fixed plant with a dedicated operator and a lab running daily gradation tests will hold spec over the long haul. But the assumption that "fixed is automatically more consistent" doesn't hold up on the timescales that matter in emergency work.

Conclusion on drift: for 90-day to two-year projects, modern mobile technology is at least as consistent as fixed—often more. For decade-long operations, fixed still has the edge. When I say "consistent," I do not mean "simple." The technology behind it is seriously sophisticated.

4. Exit Cost and Redeployment: The Forgotten Number

Most capex spreadsheets include "residual value." Almost none include exit cost.

When a fixed plant's life is over, you're left with concrete foundations, buried steel, and site restoration obligations. Demolition, environmental remediation, and decommissioning permits can eat an alarming chunk of whatever resale value remains. I've watched clients pay six figures just to make a site "clean" again.

A Kleemann mobile plant doesn't have that problem. When the project ends, you load it onto trucks and send it to the next site. In Q3 2024, we relocated an MR 130(i) EVO2 impact crusher across two states in five days—including transport permits and commissioning at the new location.

Conclusion on exit cost: mobile is a tool that follows the work. Fixed is a building that stays behind. If you're not certain that site will still be producing in a decade, the building becomes a liability.

When a Fixed Plant Is Actually the Right Call

Let me be fair, because this comparison doesn't end with "mobile always wins." If you have a decade-long mine life, a stable ore body, and the tonnage to justify full automation, a fixed plant will achieve the lowest cost per ton. Period. I've recommended fixed plants when the numbers pointed that way. Recommending anything else would have been dishonest.

A fixed plant will also outperform mobile on pure electrical efficiency—no diesel engines, grid power, lower energy cost per ton. For a permanent operation running 24/7, that's a real advantage.

But here's the thing I tell every client making this decision under deadline: a fixed plant isn't a mobile plant that's been "scaled up." It's a different species. It requires a different risk profile, a longer payback window, and a lot more patience.

The real question isn't "which is better?" It's how much time do you actually have?

Choosing: A Practical Guide

Choose Kleemann mobile equipment if:

  • Your deadline is measured in weeks, not seasons
  • Your material sources shift between projects or sites
  • You want a predictable, visible cost structure with no foundation surprises
  • Your project lifespan is uncertain
  • You need to redeploy the asset after the job is done

Choose a fixed crushing plant if:

  • You have a 10+ year reserve on one site
  • You're running continuous high-tonnage with grid power
  • You have the operating team and maintenance infrastructure
  • You can absorb 6-18 months of construction lead time
  • You're in it for the long haul, and cost per ton matters more than mobility

I went back and forth on this exact decision with a client two years ago. On paper, fixed offered lower cost per ton. But my gut said the contract uncertainty was too high, and their deadline was non-negotiable. We chose mobile. The project ended eleven months early when the material source shifted. The Kleemann unit followed the next contract. The fixed plant we didn't buy would have been an expensive monument.

Even after placing that order, I kept second-guessing. What if the mobile unit couldn't hit the gradation spec? Didn't fully relax until the first lab test came back on spec—and every one after that.

So here's the bottom line:

Start with lead time. Then cost transparency. Then drift. If the clock is running, mobile has the advantage. If the clock is running for ten years, fixed is worth the wait.

And if you're still curious about those other searches? Lewis—our senior field tech—handles the "kleemann mercedes" question all the time. His favorite response: "The only drift we chase is in the gradation curve, not the car."

Wondering about "Kristof Kleemann"? That's a person, not a company—there are a few with that name on LinkedIn these days. Either way, the Kleemann that matters to your crushing operation is the one with more than 150 years of German engineering behind it. That's the one we're talking about here.

If you've got a pile of material, a deadline, and a budget that needs to survive contact with reality: compare on those four criteria, and you'll know which direction to go. If you're still on the fence, ask yourself the question that decides everything: what's the cost of being late?

That number will tell you more than any spec sheet.