How to Evaluate a Demag Overhead Crane for Sale: A Urgent Buyer's Checklist

So You Need a Demag Overhead Crane, and You Need It NOW

You're in a spot. A production line is down, a new facility needs to come online, or a project deadline just moved up. You've found a few "demag cranes for sale" listings, and you're about to pull the trigger. Stop.

This checklist is for buyers who don't have weeks to deliberate. I've handled over 150 rush orders for critical equipment in my career. I've made the mistakes, paid the rush fees, and learned the hard way what separates a good deal from a money pit. Here are the six steps I use when I'm triaging a crane purchase under a tight deadline.

Step 1: Verify the Seller's Story (It's Not Just about the Crane)

You're not just buying a Demag overhead crane; you're buying the story of how it was treated. The first thing I do is ask for the unit's complete history. Not just the hours on the meter.

Ask for:

• Original purchase date and documentation. A 20-year-old crane that's been stored indoors is often better than a 10-year-old one that lived outside.
• Service and repair logs. You want to see consistent, professional maintenance. A gap in service history is a huge red flag.
• Reason for selling. Is the warehouse closing? Did they upgrade? Or is the crane being phased out because of persistent problems? A vague answer here is a danger sign.

Real-world example: In March 2024, I found a 15-ton Demag crane for a great price. The seller said they were "upgrading capacity." I asked for the maintenance logs. They were missing. I dug deeper and found the crane had been in a minor collision with a building support beam. The frame was tweaked. Dodged a bullet. That extra $200 for a quick inspection saved us a $50,000 headache.

Step 2: The 'Critical 5' Physical Inspection Points

You can't crawl over every inch, but you must check these five things. Most buyers only look at the paint and the hook. That's a mistake.

1. The Runway Beams. Look for signs of twisting, warping, or excessive wear on the bottom flange where the crane wheels ride. Misalignment here means the crane wasn't installed or maintained correctly.
2. The End Trucks. Check for cracks, especially around the welds near the wheels. This is a common failure point on high-cycle cranes.
3. The Trolley Wheels and Track. Listen for grinding or uneven spin. Side-to-side play in the wheels indicates worn bearings or a bent axle.
4. The Wire Rope or Chain. Look for broken wires, kinks, or heavy rust. Don't just look at the visible part; run your gloved hand along a clean section to feel for internal damage. (Learned never to assume a clean outer wrap means a healthy rope after a near-miss with a snapped cable.)
5. The Electrical Panel. Open it up. Look for signs of overheating (discolored wires, burn marks) or rodent damage. A dirty panel can mean the crane was in a harsh environment, which accelerates wear on all components.

Step 3: Demand a 'Lift' Test Under Load

It's not enough to see it move empty. You need to see it lift its rated capacity. Insist on a functional test. If the seller refuses, walk away. Period.

During the test, look for:

• Excessive noise. Grinding, banging, or high-pitched squealing from the gearbox or motor.
• Slowing or stalling under load. A sign of a weak motor or poor power supply.
• Vibration. A smooth lift should feel... smooth. Vibration points to misalignment or a failing bearing.

Here's something vendors won't tell you: The 'standard' functional test often involves lifting an empty hook, not the rated load. You have to ask for the rated load test. It's not rude; it's smart business.

Step 4: Calculate the 'Real' Total Cost of Ownership

The asking price for any Demag overhead crane for sale is just the starting point. The real cost includes what you'll spend to make it operational and keep it safe.

Factor in:

• Rigging and Transportation. Moving a 30-ton crane is not cheap. Get a binding quote from a specialized rigging company before you buy.
• Installation and Commissioning. You'll likely need a certified technician to reinstall and test the crane. This can cost thousands.
• New Hooks and Wire Rope. Many used cranes come with worn lifting hardware. Replacement is a non-negotiable safety item.
• Electrical Upgrades. Does your facility have the correct voltage and phase? Modernizing an old panel can be a major expense (not that we ever budget for it).

I get why people focus on the lowest purchase price—budgets are real. But that $20,000 "steal" can easily become a $35,000 total project. The best deal is the one with the lowest total cost, not the lowest sticker price.

Step 5: Ask for a Three-Year Spare Parts Plan

This is the step everyone forgets. Demag is a great brand with a global support network, but some components for older models can have lead times of 8-12 weeks. That's unacceptable if you need the crane for continuous operations.

Ask the seller (or your Demag representative) for the lead time on the top 5 most common failure parts for that specific model:

• Brake coils
• Limit switches
• Push-button pendant wiring
• Contactors
• Control boards

Decision point: If the lead time on a brake coil is 10 weeks, you need to buy a spare on day one. Add that to your budget. It's not optional; it's insurance against downtime.

Step 6: Get Everything in Writing, Including the 'Feel'

Before you hand over a deposit, get a written summary of the inspection and test findings. But there's one more thing I always do.

I write down my 'gut feel' from the purchase interaction. Was the seller transparent? Did they volunteer information or did I have to pry? A difficult, evasive seller during the purchase will be a nightmare if you need support later. A good relationship with the seller is worth paying a small premium for.

Common Mistakes (and What to Do Instead)

Here are the errors I see most often from buyers in a hurry:

• Mistake: Buying sight-unseen. Fix: At minimum, do a video walkthrough and a live load test via video call.
• Mistake: Assuming 'rebuilt' means 'like new.' Fix: Ask for a list of exactly what was rebuilt and by whom. A rebuild can be a great thing, or it can be a patch job.
• Mistake: Trusting the hour meter. Fix: The hour meter can be replaced. Cross-reference the hours with the service records and physical wear patterns on the wheels and wire rope.

After getting burned twice by 'probably fine' promises from discount sellers, I now budget for a third-party inspection on any used crane over $15,000. It's a $1,000 insurance policy on a $30,000 purchase. Worth every penny.