Klöckner Humboldt Deutz AG D 2506
Built: 1968–1974 · Series: D 06
More machines from model year 1968
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Klöckner-Humboldt-Deutz D 2506 (D 06 series): air-cooled two-cylinder diesel with 16 kW for smallholder and municipal use, built from 1968 to 1974
Klöckner-Humboldt-Deutz AG, headquartered in Cologne, was for decades the manufacturer that shaped German agricultural machinery more than any other through air-cooled diesel engines. Under the Deutz brand, the company fitted its tractors as standard with this cooling method, which needs no cooling water, antifreeze or water pump and suited smaller, often changing operations particularly well.
Read on 3 more paragraphs
The D 2506 carries an air-cooled two-cylinder diesel engine of 1,884 cm³ displacement, delivering 16 kW at 2,100 rpm. At a kerb weight of 1,710 kg, the tractor measures 3,340 mm in length, 1,600 mm in both height and width, and runs on a wheelbase of 1,865 mm. Its design top speed is 20 km/h.
With a design top speed of 20 km/h, a tractor of this class falls under Germany's L driving licence category, which covers vehicles up to 40 km/h. The two-cylinder engine without a water cooling circuit noticeably reduces maintenance compared with water-cooled units, but it does require a functioning fan and a clean oil cooler, since cooling air otherwise fails to circulate adequately.
When buying a used two-cylinder air-cooled tractor of this age, it is worth checking the cylinder block's cooling fins and the fan: bent fins or a jammed fan lead to overheating. The condition of the hydraulic pump, the tightness of the axles and rust on the chassis deserve equal attention. Parts for air-cooled Deutz engines in this power class are still stocked by specialist suppliers.
Sources: SpecCodex-Register: Kennwerte des Modells Klöckner-Humboldt-Deutz D 2506, DEUTZ (manufacturer)
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 22 hp (16 kW)correct |
| Rated speed | 2,100 rpmcorrect |
| Cylinders | 2correct |
| Displacement | 1,884 cm³correct |
| Bore | 100 mmcorrect |
| Stroke | 120 mmcorrect |
| Injection pressure | 175 barcorrect |
| Cooling | air-cooledcorrect |
Dimensions and weights
| Length | 3,340 mmcorrect |
|---|---|
| Width | 1,600 mmcorrect |
| Height | 1,600 mmcorrect |
| Wheelbase | 1,865 mmcorrect |
| Ground clearance | 410 mmcorrect |
| Unladen weight | 1,710 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 8V/2Rcorrect |
| Front tyres | 5.00-16 ASFcorrect |
| Rear tyres | 10-28 AScorrect |
| Top speed | 20 km/hcorrect |
Origin and approval
| Construction | frameless unit constructioncorrect |
|---|---|
| Units built | 1,668correct |
Where this model stands
Power-to-weight ratio: 9.4 kW/t (16 kW / 1.7 t)
Power class: Compact (< 40 hp)
Stronger than 8% of the tractors in the register — out of 15,663 models with a stated power figure.
Calculated from the documented figures above — not a rating.
Frequently asked questions
How much power does the Klöckner Humboldt Deutz AG D 2506 have?
The Klöckner Humboldt Deutz AG D 2506 delivers 22 hp.
How much does the Klöckner Humboldt Deutz AG D 2506 weigh?
The unladen weight is 1,710 kg.
What engine does the Klöckner Humboldt Deutz AG D 2506 have?
2 cylinders, 1,884 cm³ displacement, Diesel.
How fast does the Klöckner Humboldt Deutz AG D 2506 go?
Top speed is 20 km/h.
What are the dimensions of the Klöckner Humboldt Deutz AG D 2506?
3,340 mm × 1,600 mm × 1,600 mm.
When was the Klöckner Humboldt Deutz AG D 2506 built?
Production years: 1968–1974.
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.
- Check front and rear tyre sizes: mismatched pairs strain the drivetrain.
- Shift the gearbox cold and warm — jumps only show up at temperature.
- 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 23 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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Sources: Wikibooks Traktorenlexikon (CC BY-SA 4.0) (retrieved August 2026) · How we check the data
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.
