| Manufacturer |
John Deere |
| Price |
10,345(USD) |
| Model |
4020 |
| Equipment Type |
Row-Crop Tractors |
| Factory |
Waterloo, Iowa, USA |
ENGINES OVERVIEW
The John Deere 4020 tractor offers versatile engine options including a 6.6L diesel and various 5.6L/5.9L gasoline versions, providing flexibility for fuel choice based on availability and operational cost considerations. The diesel variant typically affords greater fuel efficiency and torque, making it suitable for heavy-duty tasks, while gasoline options can be advantageous in scenarios where diesel fuel is less accessible. However, potential challenges include maintenance complexity with multiple engine types and variations in performance characteristics under different load conditions.
| Description |
John Deere 6.6L 6-cyl diesel John Deere 5.6L 6-cyl gasoline John Deere 5.9L 6-cyl gasoline John Deere 5.9L 6-cyl LP gas |
ENGINE DETAIL 1
The John Deere 4020 is powered by a robust 6.6L diesel engine with a high compression ratio of 16.5:1, providing strong torque and efficiency at an optimal operating RPM of 1500-2200. One advantage is the increased oil capacity of 12 quarts starting from the 1969 model, enhancing engine longevity, though owners of high-crop variants or those with aftermarket modifications should be aware of the standard 8-quart capacity. Regular maintenance, particularly monitoring valve clearances of 0.018 inches, is critical for optimal performance and reliability in diverse agricultural scenarios.
| Description |
John Deere diesel 6-cylinder 12-valve liquid-cooled inline/Oil capacity on most 4020 diesels increased from 8 to 12 quarts starting with the 1969 model year, tractor serial number 201,000. High-crop diesel tractors retained the 8-quart capacity throughout the production run. Tractors fitted with after-market turbochargers, and early tractors with replacement oil pans, may also have the higher oil capacity |
| Displacement |
404ci / 6.6L |
| Bore/Stroke |
4.25x4.75inches / 108x 121mm |
| Compression |
16.5:1 |
| Rated RPM |
2200 |
| Idle RPM |
600-2500 |
| Operating RPM |
1500-2200 |
| Firing order |
1-5-3-6-2-4 |
| Starter volts |
24 |
| Coolant capacity |
24qts / 22.7L |
| Intake valve clearance |
0.018inches / 0.457mm |
| Exhaust valve clearance |
0.018inches / 0.457mm |
ENGINE OIL 1
The John Deere 4020 tractor's oil capacity differs by production period, with early models requiring 8 quarts (7.6L) and late models requiring 12 quarts (11.4L). This variation affects maintenance intervals and oil change frequency; earlier models may necessitate more frequent checks due to lower oil volume. Be mindful of the specific production date when sourcing oil or performing maintenance to ensure optimal engine protection and performance.
| Early Oil capacity |
8qts / 7.6L |
| Late Oil capacity |
12qts / 11.4L |
ENGINE DETAIL 2
The John Deere 4020 features a robust 6-cylinder, 12-valve gasoline engine with a displacement of 5.6L, providing strong torque and power delivery, ideal for farm applications. Its relatively low compression ratio of 7.5:1 allows for smoother operation and the flexibility of using LP-gas, though it may limit overall power output compared to higher compression engines. Maintenance considerations include regular checks on sparkplug and point gaps to ensure optimal performance, with idle RPMs allowing for flexibility in engine management during various field operations.
| Description |
John Deere gasoline 6-cylinder 12-valve liquid-cooled inline, Original gasoline and LP-gas engine, used through the 1965 model year |
| Displacement |
340ci / 5.6L |
| Bore/Stroke |
4.25x4.00inches / 108x 102mm |
| Compression |
7.5:1 |
| Rated RPM |
2200 |
| Idle RPM |
650-2500 |
| Operating RPM |
1500-2200 |
| Firing order |
1-5-3-6-2-4 |
| Starter volts |
12 |
| Coolant capacity |
24qts / 22.7L |
| Sparkplug gap |
0.025inches / 0.635mm |
| Point gap |
0.016inches / 0.406mm |
| Intake valve clearance |
0.015inches / 0.381mm |
| Exhaust valve clearance |
0.028inches / 0.711mm |
ENGINE OIL 2
The John Deere 4020 has an oil capacity of 9 quarts (8.5 liters), which is essential for maintaining optimal engine lubrication and performance. Ensure regular oil changes and monitor oil levels to prevent engine wear or damage, especially during heavy operational use. Proper oil management can enhance engine life and efficiency, making it ideal for both farm and industrial tasks.
ENGINE DETAIL 3
The John Deere 4020's 362 ci (5.9L) 6-cylinder engine offers a robust performance with a relatively low compression ratio of 7.5:1, making it suitable for various agricultural tasks while ensuring longevity and mechanical reliability. With a maximum rated RPM of 2200, it balances power delivery and fuel efficiency; however, the moderate RPM may limit performance in high-demand applications compared to modern tractors. Adequate oil (8 quarts) and coolant (24 quarts) capacities promote effective engine lubrication and cooling, contributing to reduced wear during extended operation in demanding conditions.
| Description |
John Deere gasoline 6-cylinder 12-valve liquid-cooled inline/The larger, 362 ci engine became available in 1966, replacing 340 ci engine |
| Displacement |
362ci / 5.9L |
| Bore/Stroke |
4.25x4.25inches / 108x 108mm |
| Compression |
7.5:1 |
| Rated RPM |
2200 |
| Firing order |
1-5-3-6-2-4 |
| Starter volts |
12 |
| Oil capacity |
8qts / 7.6L |
| Coolant capacity |
24qts / 22.7L |
ENGINE DETAIL 4
The John Deere 4020, with its 5.9L LP gas engine, provides efficient power delivery and operational flexibility in agricultural settings, rated at 2200 RPM. Its robust design features a balanced bore and stroke, 9.0:1 compression, and a 12-volt starter system, enhancing starting reliability and performance under load. While the 8-quart oil and 24-quart coolant capacities support durability, operators should monitor maintenance closely to maximize engine longevity and efficiency.
| Description |
John Deere LP gas 6-cylinder 12-valve liquid-cooled inline |
| Displacement |
362ci / 5.9L |
| Bore/Stroke |
4.25x4.25inches / 108x 108mm |
| Compression |
9.0:1 |
| Rated RPM |
2200 |
| Firing order |
1-5-3-6-2-4 |
| Starter volts |
12 |
| Oil capacity |
8qts / 7.6L |
| Coolant capacity |
24qts / 22.7L |
JOHN DEERE 4020 ENGINES
The John Deere 4020 tractor is equipped with a range of engine options, including a robust 6.6L 6-cylinder diesel, which offers higher torque for demanding agricultural tasks, and multiple gasoline variants (5.6L and 5.9L), providing versatility for lighter applications. The diesel engine is more fuel-efficient and suited for heavy-duty operations, while the gasoline options are beneficial for users preferring lower emissions and quicker start-up. However, the diesel model may present challenges with maintenance costs and initial price, making it essential to assess operating needs before selection.
| Description |
John Deere 6.6L 6-cyl diesel John Deere 5.6L 6-cyl gasoline John Deere 5.9L 6-cyl gasoline John Deere 5.9L 6-cyl LP gas |
TRANSMISSIONS OVERVIEW
The John Deere 4020 features an 8-speed transmission, offering both partially synchronized and full power shift options, enhancing operational efficiency and ease of gear changes under load. The partially synchronized system provides smoother shifting for tasks requiring precision, while the full power shift facilitates rapid transitions, ideal for varied field applications. This dual transmission approach yields versatility but may require skilled operation to maximize performance and longevity.
| Description |
8-speed partially synchronized 8-speed full power shift |
TRANSMISSION 1
The John Deere 4020's Syncro-Range transmission, while providing partially synchronized gear shifting, requires the operator to stop and disengage the clutch for station selection, which can impact efficiency in time-sensitive tasks. With 8 forward and 2 reverse gears, it offers versatility in various agricultural operations, but the need to stop for shifting may pose challenges in continuous fieldwork scenarios. The 52-quart oil capacity with 303 Special oil is essential for maintaining optimal performance and lubrication, making regular maintenance crucial for longevity.
| Transmission |
John Deere Syncro-Range |
| Type |
partially synchronized |
| Gears |
8 forward and 2 reverse |
| Oil capacity |
52qts / 49.2L 303 Special |
| Description |
Synchro-Range requires the tractor to be stopped and clutch depressed to select one of four shift stations. Once a station is selected the tractor can be shifted on the move between the two forward gears (and single reverse in stations 1 and 2) by using the clutch |
SPEEDS 1
| Description |
Row-crop tractor with 15.5-38 rear tires |
TRANSMISSION 2
The John Deere 4020 tractor features a full Power Shift transmission with 8 forward and 4 reverse gears, enabling seamless shifting without clutch engagement, enhancing operational efficiency in various field scenarios. With an oil capacity of 68 quarts (64.4 liters) of 303 Special fluid, proper lubrication is essential for maintaining transmission performance and longevity. A key advantage is the increased productivity due to reduced downtime for gear shifting, although operators must be familiar with the system to optimize its capabilities.
| Transmission |
John Deere Power Shift |
| Type |
full power shift |
| Gears |
8 forward and 4 reverse |
| Oil capacity |
68qts / 64.4L 303 Special |
| Description |
Power Shift allows shift-on-the-move between gears without clutching |
SPEEDS 2
| Description |
Row-crop tractor with 15.5-38 rear tires |
JOHN DEERE 4020 TRANSMISSIONS
The John Deere 4020’s 8-speed partially synchronized transmission allows for smoother shifting between ranges, which enhances operational efficiency in varied terrain. However, it may require driver familiarity to master shifting techniques effectively. The full power shift option provides seamless gear transitions under load, optimizing performance for demanding applications like plowing or heavy towing.
| Description |
8-speed partially synchronized 8-speed full power shift |
MECHANICAL
The John Deere 4020 tractor features a versatile 2WD/4WD configuration, enhancing traction in various field conditions, though the optional front-wheel assist (HFWD) became available post-1969, which may impact resale value. Its mechanical rear differential lock allows for improved maneuverability and stability when navigating challenging terrains. The hydraulic wet disc brakes and optional cab provide essential operator comfort and safety, making it suitable for both agricultural and utility applications.
| Drive |
4x2 2WD/4x4 HFWD 4WD *Front-wheel assist was optional after 1969 |
| Differential lock |
mechanical rear OptOptional |
| Description |
Power steering Hydraulic wet disc brakes Open operator station. Cab optional |
CAPACITY
| Gasoline Fuel |
34gal / 128.7L |
| Diesel Fuel |
34gal / 128.7L |
| LP-gas Fuel |
45gal / 170.3L |
| Synchro-Range Hydraulic system |
10gal / 37.9L |
| Power Shift Hydraulic system |
12gal / 45.4L |
HYDRAULICS
| Type |
closed center |
| Synchro-Range Capacity |
10gal / 37.9L |
| Power Shift Capacity |
12gal / 45.4L |
| Pressure |
2250psi / 155.1bar |
| Valve |
1 |
| SCV flow |
6gpm / 22.7lpm |
| Total flow |
18gpm (early) / 68.1lpm |
TRACTOR HITCH
| Rear Type |
II |
| Rear lift |
3790lbs / 1719kg |
POWER TAKE-OFF (PTO)
| Rear PTO |
independent |
| Rear RPM |
540/1000/1000 |
| Engine RPM |
1000@1900 |
| Front PTO |
independent |
| Front RPM |
1000 |
JOHN DEERE 4020 TIRES
The John Deere 4020 tractor features versatile tire options, providing enhanced traction and stability for various agricultural tasks. The row crop tires (6.00-16 front and 15.5-38 rear) improve maneuverability in tight spaces, while standard tires (7.50-18 front and 18.4-34 rear) enhance load capacity for heavier implements. However, selecting the right tire configuration is critical; row crop tires are better suited for narrow rows, while standard tires offer greater flotation in soft soils.
| Ag front |
6.00-16 (row crop) / 7.50-18 (standard) |
| Ag rear |
15.5-38 (row crop) / 18.4-34 (standard) |
DIMENSIONS & TIRES
The John Deere 4020, with a row crop wheelbase of 97.5 inches, is designed for enhanced maneuverability in tight spaces, making it suitable for specialized row crop tasks. Weighing between 8,225 to 9,560 pounds, it offers substantial stability and traction, but could present challenges in softer soils due to potential sinking. The tire specifications (6.00-16 front and 15.5-38 rear) facilitate efficient weight distribution and driving performance, critical for both fieldwork and transport scenarios.
| Row crop Wheelbase |
97.5inches / 247cm |
| Standard Wheelbase |
100.25inches / 254cm |
| Weight |
8225 to 9560 pounds |
| Front tire |
6.00-16 |
| Rear tire |
15.5-38 |
4020 SERIAL NUMBERS
| 1969 |
201000 |
| 1972 |
260791 |
| Final |
270288 |
4020 SERIAL LOCATION
| Description |
Serial number plate on the rear of the 4020 transmission case |
ELECTRICAL
| Ground |
positive (1964-1969) / negative (1969-1972) / floating (24V) |
| Charging system |
Motorola alternator |
| Charging amps |
55 |
| Batteries |
2 (24V system) / 1 (12V system) |
| Battery volts |
12 |
| Battery AH |
75 |
