The John Deere 4020, produced from 1963 to 1972, stands as one of the most iconic tractors in agricultural history. Renowned for its reliability, versatility, and performance, the 4020 became a staple on farms across the globe. This comprehensive guide delves into the full specifications of the John Deere 4020, providing detailed insights into its engine options, transmission systems, dimensions, and more.
General Information
- Manufacturer: John Deere
- Production Years: 1963–1972
- Type: Row-Crop Tractor
- Factories: Waterloo, Iowa, USA; Mexico
- Total Units Built: 184,879
- Diesel: 168,311
- Gasoline: 8,123
- LP Gas: 8,445
- Standard: 17,732
- Original Price (1972): $10,345
Engine Options
Diesel Engine
- Type: John Deere 6.6L 6-cylinder diesel
- Displacement: 404 cubic inches (6.6 liters)
- Bore/Stroke: 4.25 x 4.75 inches (108 x 121 mm)
- Compression Ratio: 16.5:1
- Rated RPM: 2200
- Idle RPM: 600–2500
- Operating RPM: 1500–2200
- Firing Order: 1-5-3-6-2-4
- Starter Voltage: 24V
- Coolant Capacity: 24 quarts (22.7 liters)
- Oil Capacity:
- Early Models: 8 quarts (7.6 liters)
- Late Models (post-1969): 12 quarts (11.4 liters)
- Valve Clearance: Intake and Exhaust: 0.018 inches (0.457 mm)
Gasoline Engine
- Type: John Deere 5.6L or 5.9L 6-cylinder gasoline
- Displacement:
- Early Models: 340 cubic inches (5.6 liters)
- Later Models: 362 cubic inches (5.9 liters)
- Bore/Stroke:
- 340 ci: 4.25 x 4.00 inches (108 x 102 mm)
- 362 ci: 4.25 x 4.25 inches (108 x 108 mm)
- Compression Ratio: 7.5:1
- Rated RPM: 2200
- Idle RPM: 650–2500
- Operating RPM: 1500–2200
- Firing Order: 1-5-3-6-2-4
- Starter Voltage: 12V
- Coolant Capacity: 24 quarts (22.7 liters)
- Oil Capacity: 9 quarts (8.5 liters)
- Spark Plug Gap: 0.025 inches (0.635 mm)
- Point Gap: 0.016 inches (0.406 mm)
- Valve Clearance:
- Intake: 0.015 inches (0.381 mm)
- Exhaust: 0.028 inches (0.711 mm)
LP Gas Engine
- Type: John Deere 5.9L 6-cylinder LP gas
- Displacement: 362 cubic inches (5.9 liters)
- Bore/Stroke: 4.25 x 4.25 inches (108 x 108 mm)
- Compression Ratio: 9.0:1
- Rated RPM: 2200
- Firing Order: 1-5-3-6-2-4
- Starter Voltage: 12V
- Coolant Capacity: 24 quarts (22.7 liters)
- Oil Capacity: 8 quarts (7.6 liters)
Transmission Options
- Syncro-Range: 8 forward speeds, 2 reverse speeds (partially synchronized)
- Power Shift: 8 forward speeds, 4 reverse speeds (full power shift)
Power Ratings
- Drawbar Power (Tested): 83.79 hp (62.5 kW)
- PTO Power (Tested): 95.83 hp (71.5 kW)
Mechanical Features
- Drive: 4×2 2WD; 4×4 HFWD 4WD (front-wheel assist optional after 1969)
- Differential Lock: Mechanical rear (optional)
- Steering: Power steering
- Brakes: Hydraulic wet disc brakes
- Operator Station: Open operator station; cab optional
Capacities
- Fuel Capacity:
- Gasoline: 34 gallons (128.7 liters)
- Diesel: 34 gallons (128.7 liters)
- LP Gas: 45 gallons (170.3 liters)
- Hydraulic System Capacity:
- Syncro-Range: 10 gallons (37.9 liters)
- Power Shift: 12 gallons (45.4 liters)
Hydraulics
- Type: Closed center
- Pressure: 2250 psi (155.1 bar)
- Valves: 1
- SCV Flow: 6 gpm (22.7 lpm)
- Total Flow (Early Models): 18 gpm (68.1 lpm)
Tractor Hitch
- Rear Type: II
- Rear Lift Capacity: 3790 lbs (1719 kg)
Power Take-Off (PTO)
- Rear PTO: Independent
- Rear PTO Type: 540/1000 (1.375 inches)
- Engine RPM: 540@1900; 1000@1900
- Front PTO: Independent
- Front PTO Type: 1000
- Engine RPM: 1000@1900
Dimensions & Tires
- Wheelbase:
- Row Crop: 97.5 inches (247 cm)
- Standard: 100.25 inches (254 cm)
- Weight: 8225 to 9560 lbs (3730 to 4336 kg)
- Front Tire: 6.00-16
- Rear Tire: 15.5-38
Electrical System
- Ground: Negative
- Charging System: Generator (early models), Alternator (later models)
- Charging Amps: 10 amps (generator), up to 55 amps (alternator)
- Battery Voltage: 12V (later models), 24V (early diesel models with 2x12V batteries)
Serial Number Reference
Serial numbers are located on a plate beneath the right-side battery box. They are critical for identifying year of production and compatibility with parts.
| Year | Serial Number Range |
|---|---|
| 1964 | 65000+ |
| 1965 | 119000+ |
| 1966 | 149000+ |
| 1967 | 179000+ |
| 1968 | 201000+ |
| 1969 | 222000+ |
| 1970 | 250000+ |
| 1971 | 260791+ |
| 1972 | 285000+ |
Common Attachments
The John Deere 4020 was compatible with numerous front and rear attachments:
- John Deere 148 Loader
- John Deere 158 Loader
- Backhoes (aftermarket and JD models)
- 3-point cultivators and mowers
- Front-end blades and snowblowers
Due to its Category II 3-point hitch and robust PTO, the 4020 could operate a wide variety of implements, making it a true workhorse in the field.
Legacy and Modern Value
The 4020’s reputation for durability has kept it in high demand even decades after production ended. It’s common to find these tractors still running strong on family farms. Many are restored for shows or used in light-duty work. Original and refurbished models can command premium prices depending on condition and features.
Diesel versions are more popular, especially those with Power Shift transmissions and front-wheel assist. Collectors also value original paint, operator’s manuals, and early serial numbers.
Planning for Upgrades or Financing
Whether you’re restoring a John Deere 4020 or considering purchasing one for your farm, it’s important to understand the investment. Replacement engines, hydraulic parts, tires, and attachments can add up fast. Use a reliable tractor loan calculator to plan your restoration or purchase. It helps break down costs, monthly payments, and interest so you can manage your budget smartly.
Conclusion
The John Deere 4020 is a legendary machine that combines classic design with long-lasting performance. With powerful engine options, versatile transmissions, and rugged hydraulics, it remains one of the most celebrated tractors in John Deere’s history. Whether you’re farming, restoring, or collecting, knowing the full specs of this iconic tractor ensures you make informed decisions for maintenance, upgrades, and use.
If you’re considering upgrading your fleet or financing a vintage tractor purchase, don’t forget to use the tractor loan calculator to help manage costs and secure your investment in a timeless piece of farming history.