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Fiat Trattori 666 (DT)

Built: 1982–1986 · Series: 66 er-Baureihe

More machines from model year 1982

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With the 666 (DT), Fiat Trattori offers a model from the 66er series. Production: 1982–1986. The engine delivers 68 hp (50 kW), has 4 cylinders, with a displacement of 3,456 cm³. Torque is 218 Nm. Rated speed is 2,500 rpm. The machine is 3,412 mm long, 1,960 mm wide and 2,355 mm high. The unladen weight is 2,580 kg. The wheelbase measures 2,305 mm. Ground clearance is 495 mm. Top speed is 25 km/h. Transmission: 12 V/4 R, 20 V/8 R and 12 V/12 R. The engine is water-cooled. Tyres: front 7.50-16 ASF (DT: 11.2 R 24 AS), rear 16.9-30 AS. The fuel is diesel. The bore measures 100 mm. The stroke is 110 mm. The compression ratio is 17:1. Maximum torque is reached at 1,300 rpm. Construction: unit construction (no separate frame). The 66 er-Baureihe series covers 4 models. Rated output within it ranges from 54 to 78 hp; the 666 (DT) sits in the middle of that range with 68 hp. Its immediate neighbours are the 566 (DT) below it with 58 hp and the 766 (DT) above it with 78 hp. Unladen weight within it ranges from 2,280 to 2,730 kg; here the 666 (DT) sits in the upper part of that range with 2,580 kg. 99 Fiat Trattori models across 9 series are on record.

Fiat Trattori 66 series – field tractors of the 1980s: three- and four-cylinder diesels at 2,592 to 3,664 cc, 39.7 to 54.7 kW, types 466, 566, 666 and 766 (DT)

The 66 series followed the earlier model generations at Fiat Trattori in Turin during the 1980s, covering the mid power class with the four types 466, 566, 666 and 766; the leading digits mark the ascending power step, and the ending 66 the series itself. Here too the DT suffix denotes the four-wheel-drive version with Doppia Trazione, while the base versions ran rear-wheel drive only.

Read on 3 more paragraphs

The register lists 4 versions with 39.7 to 54.7 kW from three- and four-cylinders of 2,592 to 3,664 cc displacement at 2,500 to 2,600 rpm; torque ranges from 170 to 262 Nm. Unladen weights lie between 2,280 and 2,730 kg, lengths between 3,222 and 3,622 mm, widths between 1,920 and 2,050 mm, and heights between 2,355 and 2,435 mm.

The 66 series tractors were aimed at medium-sized arable farms and competed directly with the contemporaneous models from Same, Lamborghini, Landini and Ford of similar power class; after the merger with Ford in the early 1990s the series was phased out under the new brand logic.

On a used purchase, check the condition of the clutch and gearbox, the tightness of the hydraulics, and corrosion on wings and bonnet; on DT four-wheel-drive versions also check the condition of the front axle and its joints, and parts now run through independent agricultural machinery dealers.

Sources: SpecCodex register, model data: Fiat Trattori 66er-Baureihe

Technical data

Engine

Fuel	dieselcorrect
Power	68 hp (50 kW)correct
Rated speed	2,500 rpmcorrect
Torque	218 Nmcorrect
Speed at max. torque	1,300 rpmcorrect
Cylinders	4correct
Displacement	3,456 cm³correct
Bore	100 mmcorrect
Stroke	110 mmcorrect
Compression ratio	17correct
Cooling	water-cooledcorrect

Dimensions and weights

Length	3,412 mmcorrect
Width	1,960 mmcorrect
Height	2,355 mmcorrect
Wheelbase	2,305 mmcorrect
Ground clearance	495 mmcorrect
Unladen weight	2,580 kgcorrect

Drivetrain and chassis

Drive	rear- or four-wheel drivecorrect
Gearbox	12 V/4 R, 20 V/8 R and 12 V/12 Rcorrect
Front tyres	7.50-16 ASF (DT: 11.2 R 24 AS)correct
Rear tyres	16.9-30 AScorrect
Top speed	25 km/hcorrect

Origin and approval

Construction	unit construction (no separate frame)correct

Where this model stands

Power-to-weight ratio: 19.4 kW/t (50 kW / 2.6 t)

Power class: Universal (40–100 hp)

Stronger than 47% 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 Fiat Trattori 666 (DT) have?

The Fiat Trattori 666 (DT) delivers 68 hp.

How much does the Fiat Trattori 666 (DT) weigh?

The unladen weight is 2,580 kg.

What engine does the Fiat Trattori 666 (DT) have?

4 cylinders, 3,456 cm³ displacement, Diesel.

How fast does the Fiat Trattori 666 (DT) go?

Top speed is 25 km/h.

What are the dimensions of the Fiat Trattori 666 (DT)?

3,412 mm × 1,960 mm × 2,355 mm.

When was the Fiat Trattori 666 (DT) built?

Production years: 1982–1986.

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 24 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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