Orenstein & Koppel / Mba SA751
Built: 1938–1943 · Series: SA
More machines from model year 1938
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Orenstein & Koppel/Mba SA751 (1938-1943): two-cylinder diesel tractor with water cooling, 22.1 kW output and a top speed of 16 km/h from the SA series
Orenstein & Koppel built farm tractors alongside light railways and construction machinery, and on this model appeared jointly with the Mba designation. The SA751 from the SA series was built between 1938 and 1943, mostly during the Second World War, a period when raw materials for civilian farm equipment were scarce.
Read on 3 more paragraphs
The water-cooled two-cylinder diesel engine displaces 3,532 cm³ and delivers 22.1 kW at 1,300 rpm, equivalent to 30 horsepower. With a weight of 2,245 kg, a wheelbase of 1,930 mm and a width of 1,620 mm, the tractor was noticeably larger and heavier than the smaller SB model from the same maker. The top speed of 16 km/h shows a drivetrain built for drawbar work rather than road travel.
Two-cylinder diesel engines of this size were a common solution for mid-weight farm tractors in the 1930s and 1940s, offering more pulling power than smaller single-cylinder designs without the higher purchase and running costs of engines with four or more cylinders. Water cooling with a radiator, unlike thermosiphon cooling, required a circulation pump but delivered more even cooling under load.
For a used vehicle of this age and origin, the cooling system including pump and radiator should be checked for leaks, since spare parts for wartime model years are rarely available in original condition. The injection pump and fuel lines also deserve attention, as low-quality fuel from the period often permanently damaged the injection system.
Sources: SpecCodex-Register: Kennwerte des Modells SA751
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 30 hp (22.1 kW)correct |
| Rated speed | 1,300 rpmcorrect |
| Cylinders | 2correct |
| Displacement | 3,532 cm³correct |
| Bore | 115 mmcorrect |
| Stroke | 170 mmcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 3,150 mmcorrect |
|---|---|
| Width | 1,620 mmcorrect |
| Height | 2,300 mmcorrect |
| Wheelbase | 1,930 mmcorrect |
| Unladen weight | 2,245 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 4/1-Getriebecorrect |
| Front tyres | 6.00-18correct |
| Rear tyres | 11.25-24correct |
| Top speed | 16 km/hcorrect |
Origin and approval
| Construction | unit construction (no separate frame)correct |
|---|---|
| Units built | 1401 (beide Hersteller)correct |
Where this model stands
Power-to-weight ratio: 9.8 kW/t (22 kW / 2.2 t)
Power class: Compact (< 40 hp)
Stronger than 17% 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 Orenstein & Koppel / Mba SA751 have?
The Orenstein & Koppel / Mba SA751 delivers 30 hp.
How much does the Orenstein & Koppel / Mba SA751 weigh?
The unladen weight is 2,245 kg.
What engine does the Orenstein & Koppel / Mba SA751 have?
2 cylinders, 3,532 cm³ displacement, Diesel.
How fast does the Orenstein & Koppel / Mba SA751 go?
Top speed is 16 km/h.
What are the dimensions of the Orenstein & Koppel / Mba SA751?
3,150 mm × 1,620 mm × 2,300 mm.
When was the Orenstein & Koppel / Mba SA751 built?
Production years: 1938–1943.
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 21 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: [1]
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.