Deutz D 40
Built: 1958–1959 · Series: FL 712
More machines from model year 1958
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Deutz FL 712 (D 25 / D 40) – 1950s small tractors from Cologne: air-cooled two- and three-cylinders, 14.6 to 27.8 kW, 20 to 38 hp for smaller farms
The D 25 and D 40 models are among the small tractors with which Deutz reached smaller and mid-sized farms from Cologne in the 1950s, farms that did not yet need the brand's large field tractors. They are driven by air-cooled Deutz diesel engines with two to three cylinders, the brand's characteristic drive without coolant or radiator. The S suffix marks the more powerful engine version within each type.
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The register lists here four versions with 14.6 to 27.8 kW (20 to 38 hp) from two- to three-cylinder engines of 1,700 to 2,550 cm3 displacement. Unladen weight ranges from 1,320 to 2,050 kg, overall length from 2,940 to 3,420 mm, width from 1,552 to 1,740 mm and height from 1,520 to 1,840 mm. Rated speed sits between 1,800 and 2,300 rpm.
Small tractors like the D 25 and D 40 served the market of small farming operations in the 1950s that needed pulling power for field and transport work but could not or would not afford a large, expensive field tractor, competing with comparable small tractors from Fendt, Normag and Holder of the period.
On these now decades-old machines, what counts is the condition of the cooling fins and fan of the air cooling, the tightness of the injection pump and injectors, wear on the clutch and gearbox, and rust on the sheet metal and frame. Parts for the small Deutz engines are available through specialist vintage-tractor dealers and Deutz-Fahr clubs, no longer consistently through regular factory distribution.
Sources: SpecCodex register, model data: Deutz FL 712, Deutz (manufacturer)
Technical data
Engine
| Engine | F3L 712(Diesel, 2550 cm3, 26 kW), ab 1964 F3L 812correct |
|---|---|
| Fuel | dieselcorrect |
| Power | 35 hp (25.6 kW)correct |
| Rated speed | 2,150 rpmcorrect |
| Cylinders | 3correct |
| Displacement | 2,550 cm³correct |
| Bore | 95 mmcorrect |
| Stroke | 120 mmcorrect |
| Injection pressure | 125 barcorrect |
| Cooling | air-cooledcorrect |
Dimensions and weights
| Length | 3,350 mmcorrect |
|---|---|
| Width | 1,552 mmcorrect |
| Height | 1,680 mmcorrect |
| Wheelbase | 2,109 mmcorrect |
| Ground clearance | 395 mmcorrect |
| Unladen weight | 1,750 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 7V/3Rcorrect |
| Front tyres | 5.50-16 ASFcorrect |
| Rear tyres | 11-28 AScorrect |
| Top speed | 20 km/hcorrect |
Working data
| Fuel tank capacity | 54 lcorrect |
|---|
Origin and approval
| Construction | unit construction (no separate frame)correct |
|---|
Other data
| Linkage category | Cat Icorrect |
|---|
Where this model stands
Power-to-weight ratio: 14.6 kW/t (26 kW / 1.8 t)
Power class: Compact (< 40 hp)
Stronger than 20% 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 Deutz D 40 have?
The Deutz D 40 delivers 35 hp.
How much does the Deutz D 40 weigh?
The unladen weight is 1,750 kg.
What engine does the Deutz D 40 have?
3 cylinders, 2,550 cm³ displacement, Diesel.
How fast does the Deutz D 40 go?
Top speed is 20 km/h.
What are the dimensions of the Deutz D 40?
3,350 mm × 1,552 mm × 1,680 mm.
When was the Deutz D 40 built?
Production years: 1958–1959.
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 26 individual figures for this model. They come from 2 recorded sources; 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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