1981 John Deere 4640 Tractor Specifications and Features
The 1981 John Deere 4640 is a powerful and reliable tractor built for tough farming tasks. With a 6-cylinder, 466 cubic inch diesel engine, it produces 125 horsepower at the PTO, making it an ideal choice for heavy-duty fieldwork. The 4640 features a 16-speed transmission, offering precise control over speed and power delivery, which enhances its versatility across various agricultural operations.
The tractor’s hydraulic system is another highlight, with a flow rate of 29 gallons per minute. This ensures that implements receive the necessary power to operate efficiently. Additionally, the 4640 is equipped with a durable, heavy-duty rear axle, capable of handling demanding loads, which extends the machine’s longevity and ensures consistent performance even under tough conditions.
Its operator comfort is reinforced by a spacious and ergonomically designed cab, with easy access to controls, making long hours of work more comfortable. The cab also features a powerful air conditioning system, offering comfort in varying weather conditions. These features make the 1981 John Deere 4640 a reliable and efficient choice for any farm operation that requires durability and power.
1981 John Deere 4640 Specifications
The 1981 John Deere 4640 is equipped with a 6-cylinder, 404 cubic inch diesel engine, delivering 135 horsepower. Its turbocharged engine is designed to provide efficient power for heavy-duty tasks in both farming and construction.
Transmission options include a fully synchronized 8-speed gear transmission, which allows operators to shift smoothly even under load. The power shift transmission is also available for seamless shifting without clutching, providing ease during long working hours.
The 4640 features a hydraulic system that can handle demanding implements, offering up to 23.5 gallons per minute of flow, ensuring precision and reliability in performance. It also supports a rear PTO with a standard 1000 RPM speed, allowing various attachments to be powered effectively.
With a maximum lift capacity of 8,000 pounds at the rear, the John Deere 4640 provides robust support for heavy implements. The tractor’s design incorporates a rugged frame, capable of withstanding the challenges of tough terrain and heavy workload conditions.
In terms of operator comfort, the 4640 is equipped with a spacious cab, featuring adjustable seats, improved ventilation, and clear visibility, ensuring ease during long working hours. The controls are intuitive and well-placed, offering enhanced ergonomics for efficiency.
The John Deere 4640 also comes with a high-quality braking system, offering excellent control and safety. Its large fuel tank, with a capacity of 50 gallons, ensures extended operational periods between refueling.
Engine and Performance Features of the 1981 John Deere 4640
The 1981 John Deere 4640 is equipped with a 6-cylinder, 404 cubic inch (6.6L) engine. This engine delivers a rated power output of 125 horsepower at 2,200 RPM, ensuring it can handle demanding tasks on the field with ease. The turbocharged engine design boosts fuel efficiency while maintaining impressive power levels.
The engine’s fuel system includes an in-line injection pump and high-pressure common rail, optimizing fuel delivery and combustion. The inclusion of a turbocharger enhances air intake, providing greater power and torque at lower RPMs, making it ideal for heavy-duty operations.
The 4640’s engine also features a mechanical fuel injection system, contributing to precise fuel delivery under various load conditions. This helps maintain optimal performance and efficiency, even in challenging environments.
With a maximum torque of 380 lb-ft (515 Nm) at 1,400 RPM, the 4640 exhibits strong low-end power, essential for tasks such as plowing and tilling. The engine is mated to a quad-range transmission, which ensures smooth power delivery across a wide range of operating conditions.
Regular maintenance, such as proper oil changes and air filter replacement, will keep the engine running smoothly and prolong its lifespan. The cooling system, which features a large-capacity radiator, ensures efficient heat dissipation, especially when operating under load for extended periods.
For fuel efficiency, operators can make use of the 4640’s precise throttle control, which helps to adjust fuel consumption depending on task requirements. The engine also features a high idle speed of 2,200 RPM, which provides rapid response to increased power demands when needed.
In terms of engine diagnostics, the 4640 is designed for ease of maintenance. Its engine compartment is spacious and accessible, allowing for straightforward inspection and repair. The powertrain is built for durability, providing years of reliable performance in demanding agricultural or industrial settings.
Transmission and Drive System in the 1981 John Deere 4640
The 1981 John Deere 4640 is equipped with a full range of transmission and drive system features designed for reliable performance under demanding conditions. It uses a 16-speed PowerShift transmission, which provides smooth gear transitions for various operating speeds. This transmission allows operators to shift between forward and reverse gears without disengaging the clutch, reducing downtime and improving productivity.
The transmission system incorporates an automatic torque converter, offering smooth engagement and enhanced power delivery. It offers a range of 8 forward and 8 reverse speeds, giving flexibility for various field tasks and transport operations. The gearshift lever is strategically placed for easy access, enabling operators to adjust speed without excessive effort.
The 4640 also features a dual-range final drive, ensuring optimal power distribution to the wheels. This system is engineered to improve traction while maintaining efficiency, especially when working in tough terrain or heavy load conditions. The final drive is paired with a robust planetary gear system that enhances durability and minimizes maintenance needs.
The PowerShift transmission is coupled with a 6.8L engine, which ensures sufficient power for the tractor’s operations. The combination of the transmission and engine provides a balanced performance, offering operators the ability to handle a wide variety of agricultural tasks without compromising fuel efficiency or engine stress.
For those looking for ease of use and minimal maintenance, the 4640’s drive system is a solid choice. The use of a sealed drivetrain system significantly reduces the need for constant lubrication checks, extending the life of critical components. Regular inspections, however, remain important for ensuring continued performance and reliability.
Operator Comfort and Control Features of the 1981 John Deere 4640
The 1981 John Deere 4640 offers a well-designed operator station aimed at enhancing comfort during long hours of operation. The spacious cab features a seat with full adjustability, ensuring that operators can find the most comfortable position for their size and preference. The high-back seat with armrests provides additional support, minimizing fatigue. The cab is equipped with soundproofing materials that reduce noise, making it easier to focus on the task at hand.
The layout of controls is intuitive, with easy access to key functions. The steering wheel and pedals are adjustable, allowing the operator to customize the setup for maximum control. The gearshift is conveniently located, ensuring smooth transitions between speeds. The visibility from the cab is excellent, with wide windows and minimal obstructions, improving overall safety during operation.
Climate control features help maintain comfort regardless of weather conditions. The air conditioning system, combined with adjustable ventilation, keeps the operator cool in hot weather and warm during colder conditions. The ventilation system is designed to circulate air effectively within the cab, preventing discomfort during extended hours of use.
Advanced hydraulics and responsive steering make the 4640 highly maneuverable, even in challenging conditions. The precise control over implement functions allows operators to perform tasks with accuracy and ease. The 4640’s design supports long working hours without causing significant strain on the operator, making it a reliable machine for demanding agricultural tasks.