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Caterpillar 308: 8-tonne excavator and what to check
Caterpillar 308 — a compact mid-size excavator with an operating weight of around 8–9 tonnes. We look at the 308 CR series, key components, and what to check when buying a used 308.
308 in brief
Cat 308 — a popular choice for urban construction, road repairs, utility trenching, and landscaping. The machine is powerful enough for serious digging tasks and compact enough to work in tight spaces.
The CR letters indicate a compact tail swing — the rear doesn't stick out much during turning. This is particularly useful in urban settings with nearby buildings or traffic.
Series — what's the difference
Older versions (e.g., 308C and D) are simpler, with less electronics. The E series improved comfort and efficiency, while newer versions feature a more modern cab and advanced hydraulics.
Often offered variants include additional hydraulics for a hammer, rotating coupler, and quick coupler. It's worth thoroughly checking what equipment is installed and if it works.
Engine and key components
The Cat diesel engine is economical and reliable. Engines in newer versions meet stricter Stage emissions standards, so they may have exhaust gas treatment systems, whose condition is important to the buyer.
Key components: hydraulic pumps and valve block, swing mechanism, tracked undercarriage, boom with stick, buckets and teeth, dozer blade (if present).
What to check when buying a used 308
Check the engine hours, cold start, smoke, oil and coolant leaks. Test all hydraulic functions — movements should be smooth and powerful.
Inspect the driveshafts, wheel bearings and star wheels, play in the tie rods and track rods, and steering rack. Check if the car has been used a lot with a tow bar, and inspect the quick-release coupling.
Versions and trims
Names and equipment vary by market and production year; we list the versions most commonly found in Europe.
308C CR
older versionSimpler technology, lower price.
- Often — simpler electronics
- Often — high mileage
- Must be professionally inspected
308D CR
D seriesImproved generation.
- More comfortable cabin
- Often — additional hydraulics
- More economical engine
308E CR
E seriesThe latest generation with more advanced systems.
- Often features SCR and a particulate filter
- More advanced electronics
- More efficient hydraulics
308 CR (Next Gen)
The latest generationThe latest generation version.
- New cabin design
- Larger screen
- Often features advanced driver-assistance systems
Comparing 308 versions
| 308D CR | 308E CR | 308 CR Next Gen | |
|---|---|---|---|
| Who it's for | For budget work | For daily use | For intensive and modern work regimes |
| Engine technology | Older | Modern | Latest |
| Cab | Base | More Comfortable | Most Modern |
| Price in the used market (relatively) | Budget-friendly | Mid-range | Premium |
For budget-conscious work, the D series with a good history often fits the bill. For more intensive use, consider the E series or a newer version.
Pros
- Compact size and decent power
- Ideal for urban construction
- Good supply of Cat parts
- Holds its value well
Cons
- Prices in the used market are higher than those of other manufacturers
- The electronics in newer versions are more complex
- Expensive maintenance
Frequently asked questions
What is the weight of the Cat 308?
Operating weight is around 8–9 t, depending on the version. Check the exact weight in the documentation.
How does the 308 differ from the 305?
The 308 is heavier and more powerful than the 305, has a deeper blade and better reach. The 305 is suited to smaller jobs.
Is the 308 suitable for urban work?
Yes, especially the CR version with its compact swing. However, check if there's enough space for manoeuvres and if the machine's weight is suitable for transportation.
Updated 2026-10-21 · Trim levels and equipment vary by market and model year — check the equipment of the specific car. · Translated automatically
