| Manufacturer | John Deere |
| Price | - |
| Model | 7420 |
| Equipment Type | Row-Crop Tractors |
| Factory | Waterloo, Iowa, USA |
OCED TRACTOR TEST 1817 2
| Description | Diesel Power Quad 4WD May 20 - June 2, 2003 Link: OCED Tractor Test 1817 file PTO performance Drawbar performance |
| Max power | 102.86hp / 76.7kW |
| Fuel use | 6.7gal/hour / 25.4l/hour |
| Power at rated engine speed | 116.56hp / 86.9kW |
JOHN DEERE 7420 POWER
| Engine | 135hp / 100.7kW |
| PTO (claimed) | 115hp / 85.8kW |
| Drawbar (tested) | 102.86hp / 76.7kW |
| PTO (tested) | 127.38hp / 95.0kW |
ENGINE DETAIL
The John Deere 7420 tractor features a robust 6.8L PowerTech 6068HF475 engine, delivering 135 hp and 450 lb-ft of torque at 1500 RPM, ideal for demanding agricultural tasks and heavy-duty applications. Its efficient liquid-cooled system with a dual paper element air cleaner enhances durability and performance, while a compression ratio of 17:1 promotes fuel efficiency. Potential challenges include maintenance of the cooling and oil systems, important for sustaining long operating hours, particularly at rated RPMs between 1300 and 2100.
| Description | John Deere PowerTech 6068HF475 turbocharged diesel 6-cylinder liquid-cooled |
| Displacement | 414ci / 6.8L |
| Bore/Stroke | 4.19x5.00inches / 106x 127mm |
| Power | 135hp / 100.7kW |
| Air cleaner | dual paper elements |
| Compression | 17:1 |
| Rated RPM | 2100 |
| Idle RPM | 850-2250 |
| Operating RPM | 1300-2100 |
| Torque | 450lb-ft / 610.2Nm |
| Torque RPM | 1500 |
| Firing order | 1-5-3-6-2-4 |
| Starter volts | 12 |
| Starter power | 4.1hp / 3.1kW |
| Oil capacity | 22.2qts / 21.0L |
| Coolant capacity | 29.6qts / 28.0L |
JOHN DEERE 7420 ENGINE
The John Deere 7420 is powered by a robust 6.8L, 6-cylinder diesel engine, providing high torque and efficiency for heavy-duty tasks. Its substantial 54.7-gallon fuel tank allows for extended operation without frequent refueling, making it ideal for large agricultural fields or extensive construction sites. However, operators should consider the tractor's weight and maneuverability, especially in tighter spaces.
| Description | John Deere 6.8L 6-cyl diesel |
| Fuel tank | 54.7gal / 207.0L |
TRANSMISSIONS OVERVIEW
The John Deere 7420 features a 16-speed partial power shift transmission, offering smooth gear changes and efficient power transfer under various load conditions. This transmission design enhances productivity in field operations by providing optimal torque management and fuel efficiency. However, users may experience a learning curve due to the complexity of shifting in demanding applications.
| Description | 16-speed partial power shift 24-speed |
TRANSMISSION 1
The John Deere 7420 features a PowrQuad partial power shift transmission with 16 forward and reverse gears, which enhances versatility for varied terrain and tasks. The four power shift speeds across four ranges (A-D) allow for optimized performance in different operating conditions, making it ideal for applications like plowing and hauling. However, the oil capacity of 59.2 quarts requires regular maintenance monitoring to prevent overheating issues during extended use.
| Transmission | John Deere PowrQuad |
| Type | partial power shift |
| Gears | 16 forward and reverse |
| Oil capacity | 59.2qts / 56.0L |
| Description | Four power shift speeds (1-4) in four ranges (A-D) with left-hand reverser |
SPEEDS
| Description | With 20.8-38 rear tires |
TRANSMISSION 2
The John Deere 7420 features an AutoQuad transmission, which offers seamless gear shifting and enhances operator comfort during extended use. With 24 forward and reverse gears, it provides versatility and precise speed control for various applications, from tillage to transport. However, the complexity of the AutoQuad system may require specialized knowledge for maintenance, posing a challenge for some operators.
| Transmission | AutoQuad |
| Gears | 24 forward and reverse |
TRANSMISSION 3
The John Deere 7420 features an Infinitely Variable Transmission (IVT), allowing for seamless adjustments in speed without discrete gear shifts; this enhances operational efficiency and operator comfort. The lack of traditional gear steps facilitates smooth transitions in both forward and reverse, making it advantageous for tasks requiring precision, such as tillage or narrow-row planting. However, the availability of MFWD only may limit options for certain applications, particularly in specialized terrains or tasks requiring different drive configurations.
| Transmission | Infinitely Variable Transmission (IVT) |
| Gears | infinite forward and reverse |
| Description | available with MFWD only |
MECHANICAL
The John Deere 7420 features a versatile 4x2, 4x4 MFWD configuration, suitable for various terrains, with inboard planetary final drives enhancing durability and serviceability. Its electro-hydraulic rear differential lock optimizes traction in challenging conditions, while the power steering improves maneuverability. The 16-speed partial power shift transmission allows for efficient operation, especially in variable field conditions, though operators may need to manage gear changes attentively to maximize performance.
| Chassis | 4x2 2WD/4x4 MFWD 4WD |
| Final drives | inboard planetary |
| Differential lock | electro-hydraulic rear |
| Steering | power |
| Brakes | hydraulic wet disc |
| Cab | ComfortGard Cab standard with air-conditioning |
| Transmissions | 16-speed partial power shift 24-speed |
HYDRAULICS
| Type | closed-center PFC |
| Valves | 4 |
| Pump flow | 26.7gpm / 101.1lpm |
TRACTOR HITCH
| Rear Type | II |
| Rear lift | 7450lbs / 3379kg 8700lbs / 3946kg (optional) |
POWER TAKE-OFF (PTO)
| Rear PTO | independent |
| Clutch | electro-hydraulic |
| Rear RPM | 540/1000 (1.375) |
| Front PTO | independent. Field conversion kit |
| Front RPM | 1000 |
JOHN DEERE 7420 TIRES
The John Deere 7420 tractor is equipped with Ag front tires sized 14.9R28 and rear tires 18.4R38, optimizing traction and stability for plowing and tilling applications. The larger rear tire diameter improves power transfer and reduces soil compaction, which is advantageous for field work. However, the tire size may limit maneuverability in tighter spaces and require consideration of terrain when selecting for specialized tasks.
| Ag front | 14.9R28 |
| Ag rear | 18.4R38 |
DIMENSIONS
| 2WD Wheelbase | 112.8inches / 286cm |
| 4WD Wheelbase | 104.3inches / 264cm |
| Length | 203.3inches / 516cm |
| Width | 96inches / 243cm *Minimum width with standard axle |
| Height | 114.1inches / 289cm |
| 4WD Clearance (front axle) | 20.5inches / 52cm |
| Rear axle | Rack-and-pinion: 3.4 by 110.5inches / 86by 2806mm |
| Front tread | 59.4 to 83.4inches / 150to 211cm (4WD) |
| Rear tread | 60 to 119.2inches / 152to 302cm (110.5-inch axle) |
JOHN DEERE 7420 WEIGHT
| Shipping | 12,890lbs / 5846kg |
| Operating | 13,280lbs / 6023kg |
| Ballasted | 15,655lbs / 7101kg |
| Max capacity | 22,035lbs / 9995kg |
| Max Drawbar | 4,955lbs / 2247kg |
| Max front axle | 9,035lbs / 4098kg 15,100lbs / 6849kg (with loader) |
| Max rear axle | 17,185lbs / 7795kg |
DIMENSIONS & TIRES
The John Deere 7420 tractor features a standard 2WD wheelbase of 112.8 inches, providing stability for heavy-duty tasks, while the 4WD option, with a shorter 104.3-inch wheelbase, enhances maneuverability in tighter spaces and uneven terrain. Weighing between 12,890 to 13,280 pounds, it offers substantial traction, but operators should consider the implications of weight on soil compaction. The combination of front 14.9R28 and rear 18.4R38 tires ensures a solid footprint, suitable for various agricultural applications, though larger rear tires may limit the tractor's ability to navigate narrow rows.
| 2WD Wheelbase | 112.8inches / 286cm |
| 4WD Wheelbase | 104.3inches / 264cm |
| Weight | 12890 to 13280 pounds |
| Front tire | 14.9R28 |
| Rear tire | 18.4R38 |
JOHN DEERE 741 LOADER
| Height (to pin) | 172.5inches / 438cm |
| Clearance, dumped bucket | 139.3inches / 353cm |
| Dump reach | 38.2inches / 97cm |
| Dump angle | 58.9° |
| Clearance, level bucket | 167inches / 424cm |
| Reach at ground | 113.4inches / 288cm |
| Breakout force (at pin) | 7779lbs / 3528kg |
| Breakout force (at 800mm) | 5913lbs / 2682kg |
| Breakout force (bucket) | 7172lbs / 3253kg |
| Lift to full height (at pin) | 4617lbs / 2094kg |
| Lift to full height (at 800mm) | 3527lbs / 1599kg |
| Lift to 1.5m (at pin) | 6259lbs / 2839kg |
| Lift to 1.5m (at 800mm) | 4966lbs / 2252kg |
| Bucket width | 73inches / 185cm 96inches / 243cm |
7420 SERIAL NUMBERS
| Location | On the main tractor frame, right side, above the front axle |
| 2003 | 1001 |
| 2004 | 10001 |
| 2005 | 30001 |
| 2006 | 45001 |
| 2007 | 60001 |
ELECTRICAL
| Ground | negative |
| Charging system | alternator |
| Charging amps | 115/150 |
| Battery CCA | 850 |
| Battery volts | 12 |