AGCO Allis 6680
Built: 1991–1997 · Series: 6.600 er - Baureihe
More machines from model year 1991
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AGCO Allis 6600 series, types 6670 to 6690 – four-cylinder diesels from the US maker in Duluth: 51.5 to 66.2 kW, 2,800 to 3,110 kg, 4,000 cm³ displacement
AGCO Allis was formed in 1990 when the newly founded US group AGCO, headquartered in Duluth, Georgia, took over the agricultural machinery division of Allis-Chalmers and for a time built the tractors under the combined name AGCO Allis. The 6600 series with the types 6670, 6680 and 6690 represented the mid power class; the last two digits order the models by ascending power. Production initially took over much of the existing Allis-Chalmers plants and supplier structure, before AGCO gradually switched the model range to its own series.
Read on 3 more paragraphs
The register lists 3 versions with 51.5 to 66.2 kW (63 to 80 hp) from four-cylinder diesel engines of 4,000 cm³ displacement, torque of 239 to 304 Nm at 2,350 to 2,500 rpm. Unladen weights range from 2,800 to 3,110 kg, lengths from 4,064 to 4,094 mm, widths from 1,970 to 2,093 mm and heights from 2,743 to 2,824 mm.
As general-purpose tractors for mid-sized farms, the 6600 series competed directly with equally powerful models from Ford, Case IH and its own group sibling Massey Ferguson; the short lifespan of the AGCO Allis brand in the early 1990s makes these types comparatively rare today. The cab offered comfort typical for the era, with power steering and an enclosed operator station, which also suited the tractor to longer days of field work.
When buying used, what counts is the operating hours and service condition of the four-cylinder diesel, clutch and gearbox, the condition of the hydraulics and PTO, and corrosion on body panels; parts now mostly run through the AGCO dealer network.
Sources: SpecCodex register, model data: AGCO Allis 6600er-Baureihe
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 80 hp (58.8 kW)correct |
| Rated speed | 2,500 rpmcorrect |
| Torque | 261 Nmcorrect |
| Speed at max. torque | 1,305 rpmcorrect |
| Cylinders | 4correct |
| Displacement | 4,000 cm³correct |
| Bore | 105 mmcorrect |
| Stroke | 115.5 mmcorrect |
| Compression ratio | 17.1correct |
| Cooling | air-cooledcorrect |
Dimensions and weights
| Length | 4,094 mmcorrect |
|---|---|
| Width | 2,093 mmcorrect |
| Height | 2,824 mmcorrect |
| Wheelbase | 2,449 mmcorrect |
| Ground clearance | 440 mmcorrect |
| Unladen weight | 3,050 kgcorrect |
Drivetrain and chassis
| Drive | rear- and four-wheel drivecorrect |
|---|---|
| Gearbox | 12 V/12 R, 16 V/16 R, 24 V/12 R and 30 V/30 Rcorrect |
| Front tyres | 7.50-18 ASF (4 WD: 14.9 R 24 AS)correct |
| Rear tyres | 16.9 R 34 AScorrect |
| Top speed | 30 km/hcorrect |
Working data
| Fuel tank capacity | 79 lcorrect |
|---|
Origin and approval
| Construction | unit construction (no separate frame)correct |
|---|
Other data
| Linkage category | Cat IIcorrect |
|---|---|
| PTO speed | 540/1000 rpmcorrect |
Where this model stands
Power-to-weight ratio: 19.3 kW/t (59 kW / 3 t)
Power class: Universal (40–100 hp)
Stronger than 54% 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 AGCO Allis 6680 have?
The AGCO Allis 6680 delivers 80 hp.
How much does the AGCO Allis 6680 weigh?
The unladen weight is 3,050 kg.
What engine does the AGCO Allis 6680 have?
4 cylinders, 4,000 cm³ displacement, Diesel.
How fast does the AGCO Allis 6680 go?
Top speed is 30 km/h.
What are the dimensions of the AGCO Allis 6680?
4,094 mm × 2,093 mm × 2,824 mm.
When was the AGCO Allis 6680 built?
Production years: 1991–1997.
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 28 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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