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| info | |
| 1979 - 1982 Iron Horses Series, Four-wheel Drive (4WD) tractor | |
| Previous model: | John Deere 8630 |
| Next model: | John Deere 8650 |
| Series back: | John Deere 8440 |
| Production | |
| Manufacturer: | John Deere |
| Factory: | Waterloo, Iowa, USA |
| Original price (USD), $80,000 (1982 ), | |
| Capacity | |
| Fuel: | 214 gal [810.0 L] |
| Hydraulic system: | 41 gal [155.2 L] |
| 3-Point Hitch | |
| Rear Type: | III/IIIN |
| Rear lift: | 8545 lbs [3876 kg] |
| Power Take-off (PTO) | |
| Rear PTO: | independent |
| Rear RPM: | 1000 |
| Engine RPM: | 1000@2100 |
| Dimensions & Tires | |
| Wheelbase: | 125 inches [317 cm] |
| Weight: | 28,270 lbs [12823 kg] |
| Front tire: | 18.4-34 |
| Rear tire: | 18.4-34 |
| 8640 Serial Numbers | |
| Location: | On the tractor transmission case, rear. |
| John Deere 8640 Power | |
| Engine: | 275 hp [205.1 kW] |
| PTO (claimed): | 225 hp [167.8 kW] |
| Drawbar (tested): | 203.34 hp [151.6 kW] |
| PTO (tested): | 228.75 hp [170.6 kW] |
| Mechanical | |
| Chassis: | 4x4 articulated 4WD |
| Differential lock: | hydraulic front and rear |
| Steering: | articulated power |
| Brakes: | hydraulic wet disc |
| Cab: | Cab standard |
| Hydraulics | |
| Type: | closed center |
| Capacity: | 41 gal [155.2 L] |
| Valves: | 2 |
| Pump flow: | 33 gpm [124.9 lpm] |
| Electrical | |
| Ground: | negative |
| Charging system: | alternator |
| Charging amps: | 90 |
| Battery | |
| Number: | 2 |
| Cold-cranking amps: | 975 |
| Volts: | 6 |
| info | |
| Bore/Stroke: | 5.12x5.00 inches [130 x 127 mm] |
| Power: | 275 hp [205.1 kW] |
| Air cleaner: | dual paper elements |
| Compression: | 15.2:1 |
| Rated RPM: | 2100 |
| Idle RPM: | 800-2300 |
| Operating RPM: | 1500-2100 |
| Starter volts: | 12 |
| Oil capacity: | 26 qts [24.6 L] |
| Coolant capacity: | 48 qts [45.4 L] |
| Engine Detail | |
| John Deere, turbocharged diesel, 6-cylinder, liquid-cooled, 619 ci [10.1 L] |
| info | |
| Speeds: | With 18.4-38 tires. |
| Transmission | |
| Transmission: | John Deere Quad-Range |
| Type: | partial power shift |
| Gears: | 16 forward and 6 reverse |
| Clutch: | hydraulic wet disc |
| Oil capacity: | 164 qts [155.2 L] |
| Four gears (1-4) in four ranges (A-D). Tractor must be stopped to select range. Power shift between gears 1-2 and 3-4 within range. | |
| info | |
| Previous model: | John Deere 8630 |
| Next model: | John Deere 8650 |
| Series back: | John Deere 8440 |
| Dimensions | |
| Weight (operating): | 28,270 lbs [12823 kg] |
| Wheelbase: | 125 inches [317 cm] |
| Length: | 223.5 inches [567 cm] |
| Height (hood): | 87.1 inches [221 cm] |
| Height (cab): | 126.6 inches [321 cm] |
| Height (exhaust): | 134.5 inches [341 cm] |
| Ground clearance: | 18.4 inches [46 cm] |
| Front axle: | Rack-and-pinion: 3.937 by 95.8 inches [99x2433 mm] Rack-and-pinion: 3.937 by 118.4 inches [99x3007 mm] |
| Rear axle: | Rack-and-pinion: 3.937 by 95.8 inches [99x2433 mm] Rack-and-pinion: 3.937 by 118.4 inches [99x3007 mm] |
| Front tread: | 63 to 130 inches [160 to 330 cm] |
| Rear tread: | 63 to 130 inches [160 to 330 cm] |
| John Deere 8640 Tires | |
| Ag front: | 18.4-34 |
| Ag rear: | 18.4-34 |