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| info | |
| 1978 - 1982 Iron Horses Series, Row-Crop tractor | |
| Next model: | John Deere 4850 |
| Series back: | John Deere 4640 |
| Production | |
| Manufacturer: | John Deere |
| Factory: | Waterloo, Iowa, USA |
| Original price (USD), $60,000 (1982 ), | |
| Capacity | |
| Fuel: | 103 gal [389.9 L] |
| Hydraulic system: | 16.5 gal [62.5 L] |
| 3-Point Hitch | |
| Rear Type: | III,IIIN |
| Rear lift: | 8,295 lbs [3762 kg] |
| Power Take-off (PTO) | |
| Rear PTO: | independent |
| Rear RPM: | 1000 (1.75) |
| Dimensions & Tires | |
| Wheelbase: | 118.5 inches [300 cm] |
| Weight: | 14900 to 20370 pounds |
| Front tire: | 11.00-16 |
| Rear tire: | 18.4-38 |
| 4840 Serial Numbers | |
| Location: | Rear of tractor. |
| John Deere 4840 Power | |
| Drawbar (claimed): | 157 hp [117.1 kW] |
| PTO (claimed): | 180 hp [134.2 kW] |
| Drawbar (tested): | 151.21 hp [112.8 kW] |
| PTO (tested): | 180.63 hp [134.7 kW] |
| Mechanical | |
| Chassis: | 4x2 2WD |
| Differential lock: | pedal-actuated hydraulic |
| Steering: | power |
| Brakes: | differential hydraulic wet disc |
| Cab: | Sound-Gard cab. |
| Hydraulics | |
| Type: | closed center |
| Capacity: | 16.5 gal [62.5 L] |
| Valves: | 2 or 3 |
| Pump flow: | 23 gpm [87.1 lpm] |
| Electrical | |
| Ground: | negative |
| Charging system: | alternator |
| Battery | |
| Number: | 2 |
| Volts: | 6 |
| info | |
| Bore/Stroke: | 4.5625x4.75 inches [116 x 121 mm] |
| Air cleaner: | dual paper elements |
| Pre-heating: | ether injection |
| Compression: | 15.5:1 |
| Rated RPM: | 2200 |
| Idle RPM: | 800-2400 |
| Operating RPM: | 1500-2200 |
| Firing order: | 1-5-3-6-2-4 |
| Starter volts: | 12 |
| Coolant capacity: | 40 qts [37.9 L] |
| Engine Detail | |
| John Deere, turbocharged intercooled diesel, 6-cylinder, liquid-cooled, 466 ci [7.6 L] |
| info | |
| Next model: | John Deere 4850 |
| Series back: | John Deere 4640 |
| Transmission | |
| Transmission: | John Deere PowerShift |
| Type: | full power shift |
| Gears: | 8 forward and 4 reverse |
| Oil capacity: | 80 qts [75.7 L] |
| Clutchless shift-on-the-move power shift between all eight forward and four reverse gears. Inching pedal provided for hooking up implements and other precision work. | |
| info | |
| Next model: | John Deere 4850 |
| Series back: | John Deere 4640 |
| Dimensions | |
| Weight (shipping): | 14,900 lbs [6758 kg] |
| Weight (operating): | 18,000 lbs [8164 kg] |
| Weight (ballasted): | 20,370 lbs [9239 kg] |
| Wheelbase: | 118.5 inches [300 cm] |
| Length: | 177 inches [449 cm] |
| Width: | 96 inches [243 cm], 108 inches [274 cm] (long axle), 118 inches [299 cm] (long axle) |
| Height (cab): | 117 inches [297 cm] |
| Clearance (front axle): | 26 inches [66 cm] |
| Clearance (rear axle): | 28 inches [71 cm] |
| Clearance (drawbar): | 14.9 inches [37 cm] |
| Rear axle: | Rack-and-pinion: 3.937 by 96 inches [99x2438 mm] Rack-and-pinion: 3.937 by 108 inches [99x2743 mm] Rack-and-pinion: 3.937 by 118 inches [99x2997 mm] |
| Front tread: | 58 to 100 inches [147 to 254 cm] |
| Rear tread: | 60 to 131.5 inches [152 to 334 cm] |
| 2WD turn radius: | 14.7 feet [4.5 m], 13.4 feet [4.1 m] (with brakes) |
| John Deere 4840 Tires | |
| Ag front: | 10.00-16, 14L-16.1, 16.5L-16.1, 9.50-20 |
| Ag rear: | 24.5-32, 30.5-32, 20.8-38, 18.4-42 |