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Siirry sivupalkkiinSiirry alaosaanJohn Deere 7720-7920




The 7020 series was updated later than the rest of the lineup and did not reach Finland until autumn 2003. Power ratings moved up a step, since the outputs of the largest 6020-series models had also increased. In the U.S. market John Deere even sold smaller 7020-series variants that were in fact the European 6-cylinder 6020 models. The 7720 and 7820 were equipped with 6.8-liter, 4-valve common-rail engines. The 7920’s 8.1-liter engine also used common-rail injection but featured two valves per cylinder. The engines’ extra-power function was available above 25 km/h (15 km/h in the stepless versions) or whenever sufficient power was being transferred through the PTO.
Three transmission options were offered, each available in either a 40 km/h or 50 km/h version. The base gearbox was the 20+20-speed PowerQuad Plus. The next step up was AutoQuad Plus, which added a semi-automatic shift mode but had fewer features than the comparable system in the 6020 series. The most advanced choice was AutoPowr, introduced two years earlier on the 7010 series. Although it was John Deere’s own design, its layout corresponded closely to the ZF transmission used in the 6020 series. The AutoPowr models also included an armrest-mounted control unit and electric hydraulic valves. Hydraulic output was increased to 120 l/min, and lift capacity was raised as well.
The overall dimensions of the new tractors were noticeably larger than those of their predecessors, and weights grew by about 1 000 kg. The cab was roomier than before and featured a noise level of 72 dB. Optional extras included an active-suspension seat and front-axle suspension. Headland Management (IMS) came standard, although, as with the 6020 series, its functionality was more limited than competing systems.
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| Model | John Deere 7720 | John Deere 7820 | John Deere 7920 |
|---|---|---|---|
| Manufacturer name | John Deere | John Deere | John Deere |
| Imported to Finland | Yes | Yes | Yes |
| Years | 2003-06 | 2003-06 | 2003-06 |
| Engine model | 6068T 4V-CR | 6068T 4V-CR | 6081T |
| Cyl/Turbo/Intercooler | 6TI | 6TI | 6TI |
| Displacement | 6786 cm³ | 6786 cm³ | 8134 cm³ |
| Bore x stroke | 106,5×127 mm | 106,5×127 mm | 115,9×128,5 mm |
| Rated power | 170/2100 hp DIN/rpm | 185/2100 hp DIN/rpm | 200/2100 hp DIN/rpm |
| Max power | - | - | - |
| Torque | - | - | - |
| Gears | 20+20/stepless | 20+20/stepless | stepless |
| Synchronized gears | 20+20/stepless | 20+20/stepless | stepless |
| Powershift gears | 4-speed/stepless | 4-speed/stepless | stepless |
| Reverser | hydr. | hydr. | hydr. |
| Speeds in km/h | 2,4-40/0,05-40 | 2,4-40/0,05-40 | 0,05-40 |
| Max. speed | 42 (50) km/h | 42 (50) km/h | 42 (50) km/h |
| Hydr. flow l/min | 120 l/min | 120 l/min | 120 l/min |
| Hydraulic pressure | 200 bar | 200 bar | 200 bar |
| Lift controls | elec. | elec. | elec. |
| Lift capacity | 9177 kg | 9177 kg | 9177 kg |
| PTO speeds | 540/1000 | 540/1000 | 1000 |
| Brakes | wet disc | wet disc | wet disc |
| Steering | hydrost. | hydrost. | hydrost. |
| Turning circle m 4WD | 10.57 | 10.57 | 10.57 |
| Front tyres 4WD | 600/65R28 | 600/65R28 | 600/70R30 |
| Rear tyres 4WD | 620/70R42 | 620/70R42 | 710/70R42 |
| Weight 4WD | 7772 kg | 7772 kg | 7939 kg |
| Height with cab | 321 cm | 321 cm | 326 cm |
| Length (2WD/4WD) | 545 cm | 545 cm | 550 cm |
| Wheelbase (2WD/4WD) | 286 cm | 286 cm | 286 cm |
| Fuel tank | 392 l | 392 l | 392 l |
| Cab noise level | 72 dB | 72 dB | 72 dB |
| Solid cab | x | x | x |
| Diff. lock | friction lock | friction lock | friction lock |
| Autom. differential locks | x | x | x |
| Air suspension seat | x | x | x |
| Air conditioning | x | x | x |
| Trip computer | no radar | no radar | no radar |
| Creeper gear | opt. | opt. | opt. |
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