Caterpillar 308D CR SB
Series: Caterpillar Midi Excavator
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Caterpillar midi excavators 307 and 308 – the 7 to 8 tonne class from the Shin Caterpillar Mitsubishi era: 307B to 308E CR, CR for short tail, SB for swing boom, Mitsubishi engines, 31 to 49 kW
Caterpillar's midi excavators were built in the Japanese joint venture Shin Caterpillar Mitsubishi in Sagami – the reason the models in the register carry Mitsubishi engines: 4M40 and S4Q2, four-cylinders of 2.5 to 3.6 litres. The 307 of the 1990s founded the class at Caterpillar, the generations B, C and D followed into the 2010s, the 308 came as the bigger brother in generations C, D and E; the E70B is the forerunner from the Mitsubishi line. The codes explain the layout: CR stands for Compact Radius, the short-tail excavator whose upper structure swings almost within the track width, SB for Swing Boom, the side-swinging boom for work along walls. The 304C CR and 305C CR are the smaller short-tail models of the same generation.
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The register lists 12 versions with 30.6 to 48.5 kW from four-cylinders of 2,507 to 3,571 cm³ at rated speeds of 1,800 to 2,400 rpm and operating weights from 4,800 to 8,416 kg.
The midis fill the gap at Caterpillar between the minis up to 5 t and the 311, the smallest standard excavator: urban sewer work, house connections, landscaping and rental are the fields, and the short tail is standard in this class because the excavators work beside moving traffic.
On used machines, operating hours, play in boom, stick and swing-boom bearings, undercarriage condition (steel or rubber tracks), leak-free cylinders and the auxiliary hydraulics for breaker and tiltrotator count; parts run through Cat dealers, engine parts also through Mitsubishi.
Sources: SpecCodex register, model data: Caterpillar Midibagger, Caterpillar Mini- und Midibagger (manufacturer)
Technical data
Engine
| Engine model | 4M40 TLcorrect |
|---|---|
| Power | 58.5 hp (41.5 kW)correct |
| Displacement | 2,830 cm³correct |
| Aspiration | turbochargedcorrect |
| Coolant capacity | 15.9 lcorrect |
| Engine oil capacity | 12.9 lcorrect |
Dimensions and weights
| Ground clearance | 387.1 mmcorrect |
|---|---|
| Unladen weight | 7,850 kgcorrect |
Working data
| Pump flow | 272.2 l/mincorrect |
|---|---|
| Hydraulic oil capacity | 94.3 lcorrect |
| Hydraulic pressure | 320 barcorrect |
| Fuel tank capacity | 125.3 lcorrect |
Other data
| Cab height | 2,590.8 mmcorrect |
|---|
More machines with this engine (4M40 TL, 2)
Where this model stands
Power-to-weight ratio: 5.3 kW/t (42 kW / 7.8 t)
Stronger than 12% of the excavators & compaction in the register — out of 1,650 models with a stated power figure.
Calculated from the documented figures above — not a rating.
Frequently asked questions
How much power does the Caterpillar 308D CR SB have?
The Caterpillar 308D CR SB delivers 58.5 hp.
How much does the Caterpillar 308D CR SB weigh?
The unladen weight is 7,850 kg.
What engine does the Caterpillar 308D CR SB have?
2,830 cm³ displacement.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Check the weights in the papers against the figures here — attachments change them.
- Load the hydraulics and watch for sag.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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This page carries 14 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Other models in this series
Sources: [1]
Excavator in 3D section
Turn the model, look inside and click an assembly — each one is explained.