9 material differences · fewer than 12
Tractor oneAGCO-ALLIS 66901991–1997No measured PTO figureTractor twoMassey Ferguson MF 390 Turbo1988–1998No measured PTO figure
Which should you choose?
Read our verdict on the 6690 and the MF 390 Turbo → 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 | 6690 | MF 390 Turbo | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 88.8 hp | 88.8 hp | — |
| Engine declared | S.L.H. 1000.4 AT | Perkins AT 4.236 | differs |
| Displacement declared | 4.00 L | 3.87 L | — |
| Maximum torque declared | 224 lb·ft · 304 N·m | 247 lb·ft · 335 N·m | +10% MF 390 Turbo |
| Transmission | |||
| Top speed declared | 18.6–24.9 mph · 30–40 km/h | 18.6–24.9 mph · 30–40 km/h | — |
| Clutch declared | Pedal-operated dry Same double clutch type 12 inch | Pedal-operated, dry and air-cooled single clutch | differs |
| Hydraulics & hitch | |||
| Hydraulic centre declared | Open centre | — | — |
| Pump flow declared | 9.5 gpm · 35.8 L/min | 9.0 gpm · 34.0 L/min | +5% 6690 |
| Pressure declared | 3,046 psi · 210 bar | 2,466 psi · 170 bar | +24% 6690 |
| Rear PTO speeds declared | 540/1000/540E/1000E rpm | 540 rpm / 1000 rpm | differs |
| Weight & dimensions | |||
| Unladen weight declared | 6,856 lb · 3,110 kg | 7,937 lb · 3,600 kg | +16% MF 390 Turbo |
| Maximum permissible mass declared | 11,464 lb · 5,200 kg | — | — |
| Wheelbase declared | 96.4 in · 2,449 mm | 92.5 in · 2,350 mm | — |
| Length declared | 161.2 in · 4,094 mm | 194.7 in · 4,945 mm | +21% MF 390 Turbo |
| Width declared | 82.4 in · 2,093 mm | 83.1 in · 2,110 mm | — |
| Ground clearance declared | 17.3 in · 440 mm | 18.1 in · 460 mm | — |
| Turning radius, braked declared | 9.6 ft · 2.94 m | — | — |
| Fuel tank declared | 83.5 qt · 79.0 L | 124.7 qt · 118 L | +49% MF 390 Turbo |
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 6690 sources
- Source: Traktorenlexikon, “AGCO-Allis 6690”
Massey Ferguson MF 390 Turbo sources
- Source: Traktorenlexikon, “Massey Ferguson MF 390 Turbo”
- Source: Traktorenlexikon, “Massey Ferguson MF 398”