9 material differences · fewer than 12
Tractor oneAGCO-ALLIS 66801991–1997No measured PTO figureTractor twoVALMET 6651992–1997No measured PTO figure
Which should you choose?
Read our verdict on the 6680 and the 665 → It is generated from the rows below by a fixed, versioned rule set, and names the figure behind every call.
Field by field
9 material differences · 6 fields identical or within 5%, which is not counted as material
| Field | 6680 | 665 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 78.9 hp | 78.9 hp | — |
| Engine declared | S.L.H. 1000.4 A-1 | VALMET 420 D | differs |
| Displacement declared | 4.00 L | 4.40 L | +10% 665 |
| Maximum torque declared | 193 lb·ft · 261 N·m | 214 lb·ft · 290 N·m | +11% 665 |
| Transmission | |||
| Top speed declared | 18.6–24.9 mph · 30–40 km/h | 18.6–24.9 mph · 30–40 km/h | — |
| Clutch declared | — | Dry LuK double clutch | — |
| Hydraulics & hitch | |||
| Hydraulic centre declared | Open centre | — | — |
| Pump flow declared | 10.7 gpm · 40.5 L/min | 13.8 gpm · 52.4 L/min | +29% 665 |
| Pressure declared | — | 2,901 psi · 200 bar | — |
| Three-point lift, at the coupling points declared | 6,790 lb · 3,080 kg | 5,688 lb · 2,580 kg | +19% 6680 |
| Rear PTO speeds declared | 540/1000/540E/1000E rpm | 540E/540 rpm | differs |
| Weight & dimensions | |||
| Unladen weight declared | 6,724 lb · 3,050 kg | 7,231 lb · 3,280 kg | +8% 665 |
| Maximum permissible mass declared | 11,464 lb · 5,200 kg | — | — |
| Wheelbase declared | 96.4 in · 2,449 mm | 94.1 in · 2,390 mm | — |
| Length declared | 161.2 in · 4,094 mm | 157.5 in · 4,000 mm | — |
| Width declared | 82.4 in · 2,093 mm | 79.9 in · 2,030 mm | — |
| Ground clearance declared | 17.3 in · 440 mm | 18.1 in · 460 mm | — |
| Turning radius, braked declared | 9.6 ft · 2.94 m | 15.7 ft · 4.80 m | +63% 665 |
| Fuel tank declared | 83.5 qt · 79.0 L | 77.1 qt · 73.0 L | +8% 6680 |
Height is not in this table. It is not one measurement: the sources measure it to different points — over the cab on some machines, over the steering wheel or the exhaust on others — and the same tractor measured two ways can differ by most of a metre. It appears here only when both machines' figures carry the point they were measured to and it is the same point, which is not the case for these two. Each machine's own page prints its height as its source gives it.
AGCO-ALLIS 6680 sources
Source
- Source: Traktorenlexikon, “AGCO-Allis 6680”
- Source: Traktorenlexikon, “AGCO-Allis 5680”
VALMET 665 sources
Source
- Source: Traktorenlexikon, “Valmet 665”