D 40

Name: Deutz D 40
Brand: Deutz

Built 1958–1963 (Koneviesti; other sources give 1959 to 1965); D 40 S to 1965 in Klöckner-Humboldt-Deutz, Cologne-Deutz, West Germany

Power

35engine hp

Engine

3-cyl 2.55 L Diesel

Weight

1,750kg

Gearbox

7 forward, 3 reverse

The story

The D 40 was one of the first models in the new D series that Klöckner-Humboldt-Deutz introduced in the late 1950s to replace its older F-type tractors. It used the air-cooled three-cylinder F3L 712 diesel of 2.55 litres, giving 35 PS, with a seven-speed gearbox and a sprung front axle.

Air cooling meant no radiator to freeze or boil, a strong selling point for Deutz. The D series quickly made Deutz the market leader in West Germany, and the D 40 and its variants topped the national sales charts in the early 1960s.

A D 40 S with larger wheels and a live PTO, and a lighter D 40 L, followed before the D 40.1 and D 40.2 updates.

Did you knowThe D 40 family were the best-selling tractors in West Germany in the early 1960s.

For sale

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Specifications

Engine
Maker	Deutz F3L 712 (air-cooled)
Fuel	Diesel
Cylinders	3
Displacement	2.55 L / 155.6 cu in
Power
Rated engine power	35 hp
Drive
Transmission	7 forward, 3 reverse
Top speed	26.8 km/h / 16.7 mph
Hitch	3-point hydraulic linkage (about 1,750 kg lift); 540 rpm PTO
Size
Weight	1,750 kg / 3,860 lb
History
Built	1958–1963 (Koneviesti; other sources give 1959 to 1965); D 40 S to 1965
Factory	Klöckner-Humboldt-Deutz, Cologne-Deutz, West Germany

About these figures. This entry covers the original D 40, the best documented of the D 40 family; the later D 40.1 and D 40.2 are not covered here. 35 PS (metric) at 2,150 rpm and 128 Nm, from Koneviesti and the Hohenheim museum record. Bore 95 mm, stroke 120 mm. The D 40 S gave 38 PS at 2,300 rpm. Weight is the Hohenheim museum figure for its 1959 example; Koneviesti gives about 1,950 kg.

Sources

Last checked 1 November 2026