John Deere 8420
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| Production | |
| Manufacturer | John Deere |
| Row-Crop tractor | |
| Built in Waterloo, Iowa, USA | |
| John Deere 8420 Engine | |
| John Deere 8.1L 6-cyl diesel | |
 Engine details ... |
| John Deere 8420 Transmission | |
| 16-speed full power shift | |
 Transmission details ... |
| John Deere 8420 Power | |
| Engine (gross) | 284 hp 211.8 kW |
| Engine (net) | 270 hp 201.3 kW |
| Engine (max) | 314 hp 234.1 kW |
| PTO (claimed) | 235 hp 175.2 kW |
| Drawbar (tested) | 207.49 hp 154.7 kW |
| PTO (tested) | 269.41 hp 200.9 kW |
 Performance test details ... | |
| Mechanical | |
| Four-wheel drive | |
| Steering | hydrostatic power |
| Hydraulic wet disc brakes | |
| Trailer brakes | hydraulic OptOptional |
| Cab standard. | |
| Photos | |
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 John Deere 8420 photos... | |
| Capacity | |
| Fuel | 160 gal 605.6 L |
| Hydraulic system | 37 gal 140.0 L |
| ILS Hydraulic system | 39.6 gal 149.9 L |
| Front hubs | 3.6 qts 3.4 L |
| ILS Front hubs | 4.2 qts 4.0 L |
| Front diff. | 14.2 qts 13.4 L |
| Hydraulics | |
| Type | closed center pressure-flow compensated (PFC) |
| Capacity | 37 gal 140.0 L |
| ILS Capacity | 39.6 gal 149.9 L |
| Pressure | 2900 psi 200.0 bar |
| Valves | 4 to 5 |
| SCV flow | 30 gpm 113.6 lpm |
| Total flow | 33.5 gpm*With standard 45cc pump 126.8 lpm |
| 42.5 gpm*Optional 57cc pump 160.9 lpm | |
| Tractor hitch | |
| Rear Type | III/IIIN |
| Rear lift | 15180 lbs 6885 kg |
| 17300 lbsOptOptional 7847 kg | |
| Front Hitch | IIIN OptOptional |
| Front lift | 11000 lbs 4989 kg |
| Power Take-off (PTO) | |
| Rear PTO | independent |
| Clutch | hydraulic wet discs |
| Rear PTO Type | 1000 (1.75) |
| 540/1000 (1.375 optional) | |
| Engine RPM | 540@1975 |
| 1000@2200 | |
| Dimensions & Tires | |
| Wheelbase | 118.9 inches 302 cm |
| 117.7 inches (ILS) 298 cm | |
| Weight | 21650 to 23780 pounds |
| Front tire | 16.9R30 |
| Rear tire | 18.4R46 |
 Full dimensions and tires ... | |
| 8420 Serial Numbers | |
| Location: | Serial number plate on rear of tractor. |
| 2002 | 1001 |
| 2003 | 10001 |
| 2004 | 20001 |
| 2005 | 30001 |
FAQ: How to read a serial number table. | |
| Electrical | |
| Ground | negative |
| Charging system | alternator |
| Charging amps | 150 |
| Batteries | 2 |
| Battery CCA | 925 |
| Battery volts | 12 |
| Page information | |
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| TractorData is a family-owned small business located in Minnesota that has been providing reference information on tractors since 1999. | |
| Peter Easterlund - owner/author | |
| Email: Peter@TractorData.com | |
| Updated on May 27, 2015 | |
| http://techpubs.deere.com/ - Official operator manuals for purchase or download from Deere. |