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Fahr HG 25

Built: 1942–1948 · Series: HG

More machines from model year 1942

Source: https://de.wikibooks.org/wiki/Traktorenlexikon:_Fahr_HG_25

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The HG 25 from Fahr is part of the HG series. Production: 1942–1948. The engine delivers 25 hp (18.4 kW), has 2 cylinders, with a displacement of 3,940 cm³. Rated speed is 1,500 rpm. The machine is 3,455 mm long, 1,590 mm wide and 1,935 mm high. The unladen weight is 2,730 kg. The wheelbase measures 2,220 mm. Ground clearance is 300 mm. Top speed is 8 km/h. Transmission: 3V/1R or 5V/1R. The engine is water-cooled. Tyres: front 650 x 115 mm, rear 1.000 x 265 mm. The fuel is Holz/Kohle/Torf. The bore measures 130 mm. The stroke is 150 mm. Construction: unit construction (no separate frame). Around max. 3.194 units were built. Rated output across the Fahr range ranges from 10 to 65 hp; the HG 25 sits in the lower part of that range with 25 hp. Its immediate neighbours are the D 181 below it with 24 hp and the D 28 above it with 28 hp. Rated output across the Fahr range ranges from 10 to 74 hp; here the HG 25 sits in the lower part of that range with 25 hp. 88 Fahr models across 7 series are on record.

Fahr HG 25: water-cooled two-cylinder farm tractor from Gottmadingen built to run on wood, coal and peat, with 25 hp and a weight of 2,730 kg, built from 1942 to 1948

Fahr, the tractor and combine-harvester maker from Gottmadingen on Lake Constance, built the HG 25 between 1942 and 1948 – spanning the end of the war and into the early postwar years. The register lists wood, coal and peat as the fuel, pointing to a conversion to producer gas (wood gas), a common measure in this period given scarce and rationed diesel and petrol supplies.

Read on 3 more paragraphs

The water-cooled two-cylinder engine of 3,940cc produces 25 hp (18.4 kW) at 1,500 rpm. At 2,730 kg, 3,455 mm long, 1,935 mm high and 1,590 mm wide, the HG 25 was a sturdy tractor for its time; the wheelbase is 2,220 mm and the top speed only 8 km/h.

Producer-gas tractors carried a generator that converted solid fuels such as wood, coal or peat into a combustible gas that powered the engine instead of diesel or petrol. This gave independence from liquid fuel but cost power and required constant attention to the generator, which, together with the large displacement, explains the comparatively modest output and the low top speed.

With such a rare vehicle built around wartime and postwar technology, the condition of the water-cooled engine block and cooling system for corrosion matters most, as an original wood-gas generator is usually missing today, or the engine has long since been converted back to ordinary diesel operation. Matching original generator parts today can realistically only be found through museums and restoration specialists.

Sources: SpecCodex-Register: Kennwerte des Modells HG 25

Technical data

Engine

FuelHolz/Kohle/Torfcorrect
Power25 hp (18.4 kW)correct
Rated speed1,500 rpmcorrect
Cylinders2correct
Displacement3,940 cm³correct
Bore130 mmcorrect
Stroke150 mmcorrect
Coolingwater-cooledcorrect

Dimensions and weights

Length3,455 mmcorrect
Width1,590 mmcorrect
Height1,935 mmcorrect
Wheelbase2,220 mmcorrect
Ground clearance300 mmcorrect
Unladen weight2,730 kgcorrect

Drivetrain and chassis

Driverear-wheel drivecorrect
Gearbox3V/1R or 5V/1Rcorrect
Front tyres650 x 115 mmcorrect
Rear tyres1.000 x 265 mmcorrect
Top speed8 km/hcorrect

Origin and approval

Constructionunit construction (no separate frame)correct
Units builtmax. 3.194correct

Where this model stands

Power-to-weight ratio: 6.7 kW/t (18 kW / 2.7 t)

Power class: Compact (< 40 hp)

Stronger than 12% 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 Fahr HG 25 have?

The Fahr HG 25 delivers 25 hp.

How much does the Fahr HG 25 weigh?

The unladen weight is 2,730 kg.

What engine does the Fahr HG 25 have?

2 cylinders, 3,940 cm³ displacement, Holz/Kohle/Torf.

How fast does the Fahr HG 25 go?

Top speed is 8 km/h.

What are the dimensions of the Fahr HG 25?

3,455 mm × 1,590 mm × 1,935 mm.

When was the Fahr HG 25 built?

Production years: 1942–1948.

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 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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Sources: [1] [2]

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