Here's the thing about owning a mobile crusher: the worst time to learn about it is the morning after it stops. In my role coordinating emergency field service for Kleemann mobile crushing and screening plants, I've handled close to 200 urgent breakdowns in 11 years—maybe 180; I'd have to check our system. The pattern is predictable enough that we work from this checklist.

Most buyers focus on engine hours, jaw size, and price. They completely miss whether the wear parts due in the next 500 hours are in stock anywhere. The question everyone asks is: How many hours are on it? The question they should ask is: What parts will need replacing soon, and how long do they take to arrive?

This list is for the situation that happens after the stop—when a Kleemann MC 110i EVO2 jaw crusher, an MR 130i EVO2 impact crusher, or a cone plant has shut down and material has to move within 72 hours. If you have a week, call your dealer and schedule normal diagnostics. If you have two days, work the list in order. Eight steps total. Nothing here is theoretical.

Step 1: Lock the real deadline

The customer will say, "I need the crusher running Thursday." That isn't a deadline. Thursday at what time? Is the first truck arriving at 6:00 am or 2:00 pm? Is the material being loaded directly from the crusher, or does the stockpile have to be tested and signed off first?

Once, we rushed a repair to get a plant running by 11:00 pm, only to find the site gate locked and no night shift to receive the machine. The crusher ran for two hours while we argued with a security guard. The customer's real deadline was 6:00 am, and we would have met it easily if we had asked earlier. Saved the job, learned the question.

Step 2: Diagnose before you order anything

Pull the fault memory and the service screen before you pick up the phone. On the EVO2 series, according to Kleemann's official documentation (kleemann.info), the Continuous Feed System monitors crusher level and adjusts the feeder automatically. If the machine stopped, the event log usually tells you whether it was an overload, a blockage, or a component fault. That distinction changes your first move completely.

When I'm triaging an emergency call, my first 20 minutes on site are spent looking, listening, and asking—not turning wrenches. The worst parts order we ever placed was a $6,400 hydraulic cylinder based on a quick visual check. The actual leak was a $28 hose. The cylinder sat on a shelf for nine months.

Step 3: Verify the part actually exists before you remove the old one

This sounds obvious, but in an emergency it's the first thing that goes out the window. Do not pull the crusher apart until you have confirmed, by serial number, that the replacement is on a shelf somewhere. Internet inventory is not shelf inventory.

Learned never to assume "same model year" means the same part. We replaced a flywheel on one MC 110 using the part number for the next build series—the machine looked identical, the casting wasn't. What should have been a four-hour repair took four weeks.

My colleague Robert, who runs the parts counter, has a rule: if it isn't on a shelf, it doesn't exist. He's right.

Step 4: Ask what changed since the last good run

This is the step people laugh at until it saves the job. The operator usually knows more than the error code does. Ask what was different this shift: new fuel supplier, different screen media, a magnet that stopped picking up steel, a loader operator who started feeding too fast?

One of our most common emergency calls in 2024 was a blocked inlet chute caused by a damaged rubber skirt that had been flagged in a walkaround report two weeks earlier. No one fixed it because no one connected it to the production stoppage. Five minutes of verification beats five days of correction.

And yes, sometimes the answer is that the new operator skipped the daily grease. That's also useful information.

Step 5: Fix the next predictable failure while it's stopped

This is the step that catches people off guard. You are not saving time by replacing only the broken part. In a crusher, one seized bearing usually means adjacent bearings, belts, and seals have had a hard life too. If the plant is open, the wear parts are accessible, and your replacement parts are available, replace what is cheap and predictable now—even if it's not failed yet.

In March 2024, a client with a Kleemann MR 130i EVO2 had a conveyor bearing seize 36 hours before a site was due to start receiving 6,000 tonnes of base material. Normal replacement lead time was four days. We found the bearing at a dealer three states away and sent our own truck to collect it. Total rush cost: about $840 in fuel, tolls, and overtime, on top of the $3,400 base repair. The machine was crushing again by 11:00 pm. The client's alternative was a $50,000 late-delivery penalty. But while we were in there, we also replaced both adjacent belts and a return roller. That's the part of the story that saved them from a second call two weeks later.

Step 6: Book transport and courier options at the same time as the diagnosis

Don't wait until the parts order is confirmed to think about how the part reaches you. In rural jobs, a 500-mile courier quote can take longer to arrange than the repair itself. Call the local dealer, a sister branch, or the customer's own transport before you finish the diagnosis.

Based on our internal data from 200+ breakdown calls, the fastest route is often not a courier. It's a pickup by the site's own truck, or a service technician who is already driving in that direction. But you only find that out if you ask early.

Step 7: Run it under full load before handover

An empty-run test tells you almost nothing. The crusher needs material in the chamber, a loaded conveyor, and enough time to cycle through a few starts and stops. Too many "fixed" crushers are handed back at midnight, only to jam again at 6:00 am because the feed rate exposed a tracking problem no empty belt would show.

We have a company policy now: no machine leaves our hands after an emergency repair without a full-load test using the customer's own material, even if that takes an extra 45 minutes. We added that policy in 2023, after a repair came back to us twice in one week because we skipped it to save time.

Step 8: Document what you found before you throw it away

Photograph the failed part, tag it with the hours, and keep it if there is any warranty question. I know this feels like paperwork when you're exhausted. But the part in the bin is the only evidence you'll have if the same component fails again. The machine's history file is also what lets us spot a pattern before the next emergency. Prevention is cheaper than correction, but prevention only works when the data survives the repair.

Common mistakes I still see

The three fastest ways to turn a two-day stoppage into a two-week stoppage are:

  • Ordering by model name instead of serial number. Kleemann updates components during a model's life. The serial number is the only reference that matters.
  • Using discount filters and wear parts to feel efficient. Around $80 saved on a filter can turn into a $4,000 injector repair. No—$4,600 if you count the lost production. I'll let you do that math.
  • Telling the customer a confident ETA before the part is in your hand. It's painful to say "I don't know yet." It's more painful to explain why the machine is still down at the time you promised it would run.

If you get nothing else from this article: slow down in the first hour. The fastest repair is the one where someone locked the deadline, verified the part, and tested under load before promising anything. That's the whole job.