When it comes to large-scale construction, quarrying, or bulk earthmoving, only one type of machine truly fits the bill—a heavy-duty crawler excavator. These powerful tracked diggers, typically weighing over 20 tonnes, are built to handle tough terrain, deep digging, and demanding lifting tasks.
For many contractors, however, buying new simply isn’t practical. The upfront cost of a brand-new 20-tonne-plus excavator can be steep, and often unnecessary—especially when there’s a healthy supply of high-quality used machines on the market.
In this article, we’ll highlight some of the most trusted second-hand excavator models in the heavy-duty class, what to look out for when buying one, and how to ensure your investment is a reliable one.
Why Choose a Used Heavy-Duty Excavator?
Opting for a second-use excavator over 20 tonnes is a logical move for many construction firms. These machines are built to last, and a previously owned unit that’s been well looked after can still provide many years of productive service.
Here are three main reasons to go down the used route:
1. Lower Capital Outlay
Heavy crawler excavators are a major investment, often costing six figures when new. A carefully selected used model—especially one with moderate hours and a clear maintenance history—can cut that cost dramatically without sacrificing capability.
2. Proven Workhorse Performance
The benefit of buying a pre-used model is that you’re choosing from equipment with a track record. These machines have been put through real-world conditions and, if properly maintained, are often more reliable than new machines still in their early phase of use.
3. Faster Procurement and Setup
Lead times for new heavy equipment can stretch into months. In contrast, second-hand excavators are often immediately available—ready to be delivered, put to work, and earning their keep right away.
Recommended Heavy-Duty Used Excavator Models (20 Tonnes+)
The following models have earned widespread respect across the industry for their durability, serviceability, and performance under pressure. All are commonly available in the used equipment market and supported by parts and service networks throughout Europe and beyond.
1. Caterpillar 320 and 330 Series
Caterpillar’s 320 and 330 models have become industry staples. While the 320 comes in at just over 20 tonnes, the 330 typically ranges from 30 to 35 tonnes, depending on the configuration.
- Why it’s trusted: Reliable undercarriage systems, strong hydraulics, and consistent performance across applications
- Used Price Range: £45,000 – £85,000 depending on hours, spec, and age
- Common Usage: Earthmoving, utility installation, site clearance
These models are especially popular for their durability and ease of servicing, with parts readily available across most regions.
2. Komatsu PC210 and PC290
Komatsu machines are known for their smooth controls and excellent fuel efficiency. The PC210 is a good all-rounder for general construction, while the PC290 steps up the power for heavier jobs.
- Why it’s favoured: Precise control, strong lifting capacity, and dependable performance in mixed terrain
- Used Price Range: £40,000 – £75,000
- Common Usage: Foundation work, road construction, heavy lifting
Operators appreciate the balance between fuel economy and digging power, especially on long working days.
3. Volvo EC250 and EC300 Series
Volvo’s EC series offers a solid blend of performance and comfort. The EC250 weighs around 26 tonnes, while the EC300 is a true heavy-lifter at roughly 30 tonnes.
- Why it stands out: Spacious cab design, low-noise operation, and well-balanced hydraulic flow
- Used Price Range: £50,000 – £90,000
- Common Usage: Quarry work, demolition, major groundwork
Many buyers choose Volvo for operator comfort and the brand’s focus on safety and environmental impact.
What to Inspect Before Buying a Used Heavy-Duty Digger
Heavy-duty machines endure extreme conditions. That means a thorough inspection is essential before committing to a purchase. Here are the most important checks:
1. Check the Undercarriage
The undercarriage is where most of the wear happens—track chains, rollers, idlers, and sprockets take the brunt of the machine’s weight and movement. Excessive wear here can be costly to repair and should always be considered in your budget.
Use a wear gauge if available, or ask for close-up photos and service records that show when parts were last replaced.
2. Review the Hydraulic System
Listen for any whining, hesitations, or jerky movements when testing the boom and arm. These could point to worn pumps or leaking valves. Check for visible leaks around cylinders and hoses, and assess how quickly the attachments respond under pressure.
3. Examine Operating Hours and Work History
A machine with 6,000–9,000 hours isn’t unusual in this size class, but context matters. Light-duty use in sandy soil is very different from heavy rock work. Ask about the type of jobs it was used on and check whether regular maintenance has been documented.
Sourcing Reliable Second-Hand Heavy Excavators
In the European market, there are several dependable ways to find quality used excavators over 20 tonnes:
- Authorised dealers often resell machines that have been traded in by clients upgrading their fleet. These are usually serviced before resale.
- Used equipment platforms like Machinery Trader, Mascus, and IronPlanet allow you to compare listings across Europe, often with detailed specs and photos.
- Plant auctions can offer good deals, but it’s important to do your research and inspect equipment before bidding. Look for condition reports where available.
Always ask for service records, previous ownership details, and, if possible, arrange an on-site visit to see the machine in action.
Final Thoughts
If you’re in the market for a second-hand heavy-duty excavator over 20 tonnes, there’s no shortage of choice—provided you know what to look for. Machines like the Caterpillar 330, Komatsu PC290, and Volvo EC300 consistently deliver strong results in high-demand environments and are widely supported in the aftermarket.
By inspecting undercarriage condition, hydraulic performance, and overall work history, you can avoid costly surprises and secure a reliable machine that’s ready to take on serious work. And with lower upfront costs and faster availability, buying used can be the smartest move for your business in 2025 and beyond.
