John Deere 4840

The John Deere 4840, a flagship of the Iron Horses Series, embodies excellence in agricultural machinery. Produced from 1978 to 1982 in Waterloo, Iowa, USA, this row-crop tractor commands attention with its powerful John Deere 6466 engine, delivering 200 horsepower of turbocharged intercooled diesel power. Its mechanical prowess extends to features like pedal-actuated differential lock, power steering, and Sound-Gard cab for operator comfort. With impressive drawbar and PTO capabilities, alongside a versatile power shift transmission and advanced hydraulic system, the 4840 exemplifies John Deere’s commitment to efficiency and performance on the farm, ensuring productivity across diverse agricultural tasks.

John Deere 4840 Produktion
ManufacturerJohn Deere
SeriesIron Horses
Production Years1978 – 1982
TypeRow-Crop Tractor
BuiltWaterloo, Iowa, USA
Original Price (1982)$57,648
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)
DriveTwo-wheel drive
Differential LockPedal-actuated hydraulic
SteeringPower steering
BrakesDifferential hydraulic wet disc
ModelJohn Deere 6466
Type4 Stroke, 6-cylinder, direct injection turbocharged intercooled diesel
Displacement466 cu in (7.64 L)
Bore4.56 in (116.0 mm)
Stroke4.75 in (121.0 mm)
Rated Power200 hp (148.1 kW) @ 2200 rpm
Fuel SystemDirect injection
Fuel Tank Capacity103.0 gal (390.0 L)
Electrical System12 Volts, Alternator (90 Amps)
Power Take-Off (PTO)
Operational TypeIndependent
Horsepower180.0 hp (134.0 kW)
ClutchHydraulic disc
Speed1000 rpm (PTO/Engine Speed
TypePower Shift
Gearbox8F/4R, Full powershift
Number of Forward Gears8
Number of Reverse Gears4
Clutch TypeWet disc
Oil Capacity80.0 qts (75.7 L)
Maximum Forward Speed18.6 mph (29.9 kph)
Maximum Reverse Speed6.4 mph (10.3 kph)
Wheels and Tires
Drive Wheels2WD 4×2
Steering ConfigurationFront steer
Steering SystemPower Steering
Brake TypeDifferential hydraulic wet disc
Front Tire Size (Std)11.0-16
Rear Tire Size (Std)18.4-38
Front Tire Size (Opt)16.5L-16.1
Rear Tire Size (Opt)18.4-42
Front Tread Width58-100 in (1470-2540 mm)
Rear Tread Width60-131.5 in (1520-3340 mm)
Hydraulics and Hitch
Hydraulic System TypeClosed center
Implement Pump Flow23.0 gpm (87.1 Lpm)
Hydraulic Pressure157 bar (2275 psi)
Hydraulic Capacity16.5 gal (62.5 L)
Standard Remote Valves2/3
3-Point Hitch Category3/3N
Standard Lift Capacity8295 lb (3760 kg)
Dimensions and Weight
Wheelbase118.5 in (3000 mm)
Length177 in (4490 mm)
Height (Cab)117 in (2970 mm)
Overall Width96 in (2430 mm)
Ground Clearance14.9 in (370 mm)
Front Axle Clearance26 in (660 mm)
Turning Radius162 in (4100 mm)
Shipping Weight14900 lb (6760 kg)
Operating Weight18000 lb (8165 kg)
Ballasted Weight20370 lb (9240 kg)
John Deere 4840 overview

The John Deere 4840, a standout member of the esteemed Iron Horses Series, represents a pinnacle of agricultural innovation and power. Produced between 1978 and 1982 in Waterloo, Iowa, USA, this row-crop tractor commands attention with its robust capabilities and versatile design. With an original price tag reflecting its quality craftsmanship and advanced features, the 4840 epitomizes John Deere’s commitment to delivering top-tier equipment to farmers.
At the heart of the 4840 lies its formidable engine, the John Deere 6466. This 4-stroke, 6-cylinder diesel engine, turbocharged and intercooled, delivers a commanding 200 horsepower at 2200 rpm, ensuring ample power to tackle the most demanding agricultural tasks. With a displacement of 466 cubic inches and a compression ratio of 15.5:1, this engine exemplifies efficiency and reliability, making it a trusted workhorse on the farm.

The mechanical prowess of the 4840 extends beyond its engine, encompassing features designed to enhance performance and operator comfort. Equipped with a pedal-actuated hydraulic differential lock and power steering, this tractor offers precise control and maneuverability, essential for navigating varied terrain. The differential hydraulic wet disc brakes provide dependable stopping power, while the Sound-Gard cab ensures a quiet and comfortable working environment for operators during long hours in the field.

In terms of power delivery, the 4840 boasts impressive drawbar and PTO capabilities, with claimed ratings of 157 horsepower and 180 horsepower respectively. Tested figures validate the tractor’s performance, further cementing its reputation as a reliable and high-performing machine in the field. The independent PTO system, coupled with a hydraulic disc clutch, ensures seamless engagement and efficient operation, allowing operators to maximize productivity with a wide range of implements.

The transmission system of the 4840 is designed for optimal efficiency and versatility. With a power shift gearbox offering 8 forward and 4 reverse gears, operators can seamlessly adjust to varying field conditions, achieving a maximum forward speed of 18.6 mph and a reverse speed of 6.4 mph. The wet disc clutch mechanism ensures smooth gear changes and reliable performance, contributing to the overall efficiency of the tractor.

In terms of hydraulics and hitch capabilities, the 4840 delivers exceptional functionality and flexibility. Equipped with a closed-center hydraulic system, complemented by a powerful implement pump providing 23.0 gpm flow, this tractor can efficiently power a variety of hydraulic implements. The Category 3/3N 3-point hitch system offers ample lift capacity and compatibility with a wide range of implements, further enhancing the tractor’s versatility and utility on the farm.

In summary, the John Deere 4840 stands as a testament to John Deere’s dedication to innovation, performance, and reliability in agricultural machinery. With its powerful engine, advanced features, and versatile design, this row-crop tractor continues to be a trusted partner for farmers seeking to maximize productivity and efficiency in their operations.