If you need a replacement motor for an aging Demag hoist, the cheapest option is probably the most expensive one you'll ever buy. I learned this the hard way, and it's not just about the part itself.
My Initial Misjudgment
When I first started managing spare parts procurement for our facility, I assumed my job was to find the lowest price. I thought, 'A motor is a motor. If the specs match, why pay more?'
Three budget-busting repairs later, I realized I was completely wrong. The $500 'compatible' motor for a Demag 5 ton overhead crane ended up costing us over $2,200 after shipping, installation modifications, and the production downtime when it failed after 40 hours of operation.
That's when I shifted to total cost of ownership (TCO) thinking. And honestly, it's the single most important change I've made in my career.
What Total Cost of Ownership Actually Means
The unit price is just the tip of the iceberg. TCO includes:
- Unit price – the obvious one
- Shipping and handling – rush fees are brutal
- Modification costs – adapting a 'compatible' part never fits perfectly
- Installation labor – more complex installations cost more
- Downtime cost – every hour your crane isn't running is lost revenue
- Failure risk – the cost of a part failing mid-lift can be catastrophic
A Concrete Example
Here's something vendors won't tell you: the first quote is almost never the final price for non-OEM parts. In Q1 2024, we compared three quotes for a Demag electric motor for a 10-ton overhead crane:
- Vendor A (non-OEM): $650 quote, but after specifying required certifications and warranty, $900. Plus $150 rush shipping. Total: $1,050.
- Vendor B (OEM Demag): $1,100 quote, all-inclusive with certification, standard shipping, and a 2-year warranty. Total: $1,100.
- Vendor C (non-OEM): $500 quote (suspiciously low). After numerous clarifications, the final cost was $850, but no warranty beyond 30 days.
The TCO difference between Vendor A ($1,050) and Vendor B ($1,100) was only $50. For that $50, we got a certified part, a real warranty, and peace of mind. Vendor C's part saved $250 upfront but had a 30-day warranty. One failure would have wiped out any savings.
The 'Quality Inspector' View
As a quality and brand compliance manager at an industrial machinery company, I review every critical spare part order before it reaches our operations team—roughly 200 unique items annually. I've rejected roughly 15% of first deliveries in 2024 due to spec non-conformance, missing certifications, or damage from improper packaging.
In 2023, we received a batch of 50 hoist motors where the mounting flange dimensions were 2mm off from our spec. Normal tolerance is ±0.5mm. The vendor claimed it was 'within industry standard.' We rejected the batch, and they redid it at their cost. That delay cost us about $6,000 in expedited shipping and project delays. Now every contract explicitly includes Demag-specific mounting tolerances.
What You Need to Know About Demag Spare Parts
Demag's industrial heritage is significant—it's a brand with decades of engineering behind it. The parts (hoists, electric motors, control panels) were designed to exacting German standards. A generic replacement might physically fit, but it often lacks the specific certifications, tolerances, or duty-cycle ratings that Demag equipment requires.
Take it from someone who's seen the aftermath: a poorly-specified replacement motor can lead to overheating, inconsistent lifting speed, and premature failure. The total cost of that 'savings' is almost always higher than buying the right part the first time.
When the Cheapest Part Actually Wins
Now for the exception. If you have a non-critical application—say, a small jib crane in a low-usage workshop—and you're comfortable with the risk of a shorter lifespan, a non-OEM part can be a reasonable choice. The TCO calculation changes when downtime doesn't cost you money. Just be sure to verify the specs thoroughly. And always ask for the datasheet. If they can't provide it (ugh), that's a red flag.
But for your primary overhead cranes? The ones that keep your production line moving? Don't gamble. Spend the extra $50 or $100. In my experience, it's a no-brainer.
Pricing as of early 2025; verify current rates with your supplier.
