Fendt Dieselross F40 / F40 U
Built: 1951–1959 · Series: Dieselross
More machines from model year 1951
Not the right version? The data comes from vehicle registers holding many near-identical versions side by side. Photograph the data plate — we read make and type from it. Open the scanner e-mail address required
Fendt Dieselross (1930–1958) – the first small tractor with a diesel engine: F9, F12, F15 to F28, G25 wood gas, F236 and F237, 6.6 to 29 kW
The Dieselross is the tractor with which Fendt began: in 1930 the Marktoberdorf machine works built the first small tractor with a diesel engine – 6 hp, a Deutz single-cylinder, cutter bar and trailer hitch for farms that could not afford a Lanz Bulldog. The name stayed until 1958 and was only then replaced by the Farmer and Favorit. The type number gives the output in hp: F9 with 9 hp, F12, F15, F17, F18, F22, F24, F28; G stands for producer-gas operation – the G25 Holzgas ran on a wood gasifier during the war – H for the version with hydraulics, the three-digit F236 and F237 are the last Dieselross of the 1950s with MWM engines, the FL 114 an early type of the Farmer range. The engines came from Deutz and MWM, one to three cylinders, air- and water-cooled.
Read on 3 more paragraphs
The register lists 15 versions with 6.6 to 29 kW (9 to 25 hp), 657 to 3,979 cm³ with one to three cylinders, unladen weights from 800 to 2,400 kg, lengths from 2,280 to 3,440 mm, widths from 980 to 1,850 mm and heights from 1,290 to 1,800 mm; eleven models run on diesel, one on wood gas.
The Dieselross turned Fendt from a farm-machinery repair shop into a tractor maker and founded the brand's reputation for comfort: even the F12 had a sprung seat, and the Dieselross of the 1950s gained mower, belt pulley and PTO as standard.
Used Dieselross are the classic collector tractors of southern Germany with an active club scene; when buying, originality of engine and sheet metal, compression and injection pump, gearbox and brakes and the completeness of mower and accessories are what count.
Sources: SpecCodex register, model data: Fendt Dieselross, Fendt (AGCO, Hersteller), Fendt Dieselross (Wikipedia)
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 40 hp (29 kW)correct |
| Rated speed | 1,500 rpmcorrect |
| Cylinders | 3correct |
| Displacement | 3,534 cm³correct |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 3,440 mmcorrect |
|---|---|
| Width | 1,850 mmcorrect |
| Height | 1,800 mmcorrect |
| Wheelbase | 2,225 mmcorrect |
| Ground clearance | 460 mmcorrect |
| Unladen weight | 2,400 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 5/6v/1rcorrect |
| Front tyres | 6.00-20correct |
| Rear tyres | 13-30correct |
| Top speed | 28 km/hcorrect |
Origin and approval
| Construction | frameless unit constructioncorrect |
|---|---|
| Units built | 1,030correct |
Where this model stands
Power-to-weight ratio: 12.1 kW/t (29 kW / 2.4 t)
Power class: Compact (< 40 hp)
Stronger than 24% 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 Fendt Dieselross F40 / F40 U have?
The Fendt Dieselross F40 / F40 U delivers 40 hp.
How much does the Fendt Dieselross F40 / F40 U weigh?
The unladen weight is 2,400 kg.
What engine does the Fendt Dieselross F40 / F40 U have?
3 cylinders, 3,534 cm³ displacement, Diesel.
How fast does the Fendt Dieselross F40 / F40 U go?
Top speed is 28 km/h.
What are the dimensions of the Fendt Dieselross F40 / F40 U?
3,440 mm × 1,850 mm × 1,800 mm.
When was the Fendt Dieselross F40 / F40 U built?
Production years: 1951–1959.
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.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
Request a quote →
We ask the suppliers and come back with price and lead time.
Request spare parts →
This page carries 20 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.
Missing a figure you were looking for? Report it →
Know this machine better? Have a photo, a manual, or know that a figure is wrong? Add it to the register →
Other models in this series
Dieselross F12
Dieselross F17
Dieselross F18
Dieselross F18H
Dieselross F22
Dieselross F236
Dieselross F237
Dieselross F24
Dieselross FL114
Dieselross G25 Holzgas
F 12
F15 H6 - F15 G6
Sources: Wikibooks Traktorenlexikon (CC BY-SA 4.0) (retrieved August 2026) · Values adopted and presented in our own form; changes from the source are possible. · How we check the data
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.
