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John Deere 7720-7920

04JD7920
04JD7920ohjaamo
04JD7920
04JD7920ohjaamo
Manufacturer
Models
John Deere 7720, John Deere 7820, John Deere 7920
Years
2003-06
Info

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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Technical data
ModelJohn Deere 7720John Deere 7820John Deere 7920
Manufacturer nameJohn DeereJohn DeereJohn Deere
Imported to FinlandYesYesYes
Years2003-062003-062003-06
Engine model6068T 4V-CR6068T 4V-CR6081T
Cyl/Turbo/Intercooler6TI6TI6TI
Displacement6786 cm³6786 cm³8134 cm³
Bore x stroke106,5×127 mm106,5×127 mm115,9×128,5 mm
Rated power170/2100 hp DIN/rpm185/2100 hp DIN/rpm200/2100 hp DIN/rpm
Max power---
Torque---
Gears20+20/stepless20+20/steplessstepless
Synchronized gears20+20/stepless20+20/steplessstepless
Powershift gears4-speed/stepless4-speed/steplessstepless
Reverserhydr.hydr.hydr.
Speeds in km/h2,4-40/0,05-402,4-40/0,05-400,05-40
Max. speed 42 (50) km/h42 (50) km/h42 (50) km/h
Hydr. flow l/min120 l/min120 l/min120 l/min
Hydraulic pressure200 bar200 bar200 bar
Lift controlselec.elec.elec.
Lift capacity9177 kg9177 kg9177 kg
PTO speeds540/1000540/10001000
Brakeswet discwet discwet disc
Steeringhydrost.hydrost.hydrost.
Turning circle m 4WD10.5710.5710.57
Front tyres 4WD600/65R28600/65R28600/70R30
Rear tyres 4WD620/70R42620/70R42710/70R42
Weight 4WD7772 kg7772 kg7939 kg
Height with cab321 cm321 cm326 cm
Length (2WD/4WD)545 cm545 cm550 cm
Wheelbase (2WD/4WD)286 cm286 cm286 cm
Fuel tank392 l392 l392 l
Cab noise level72 dB72 dB72 dB
Solid cabxxx
Diff. lockfriction lockfriction lockfriction lock
Autom. differential locksxxx
Air suspension seatxxx
Air conditioningxxx
Trip computerno radarno radarno radar
Creeper gearopt.opt.opt.