2011 John Deere 644K Specifications and Key Features

The 2011 John Deere 644K offers solid performance in the loader class with its 4.5-liter, 6-cylinder engine. The engine delivers 175 horsepower, providing excellent power for demanding tasks. Its advanced powertrain system, featuring the PowerShift transmission, ensures smooth operation in various conditions.

For enhanced productivity, the 644K is equipped with a hydraulic system capable of generating up to 14,000 pounds of lift force. The maximum bucket capacity is 4.5 cubic yards, making it suitable for heavy-duty lifting and material handling. The machine’s articulation system allows for tight turning radii, improving maneuverability in confined spaces.

The operating weight of the 644K is around 22,000 pounds, with a full load capacity of 12,000 pounds. This combination of power and maneuverability positions the 644K as a reliable workhorse for construction, landscaping, and industrial tasks. The machine’s versatility is further enhanced by its attachment compatibility, allowing for a wide range of tools and equipment to be used with it.

Whether operating on rough terrain or in tighter spaces, the 644K’s hydraulic, mechanical, and electrical systems work in harmony to ensure that the machine performs at its best. Routine maintenance is simplified thanks to easily accessible service points, reducing downtime and keeping the loader operating efficiently over time.

2011 John Deere 644K Specs

The 2011 John Deere 644K loader offers exceptional performance across a variety of tasks. Powered by a 6.8-liter, 6-cylinder engine, it delivers 173 horsepower, ensuring reliability for demanding jobs. With a maximum operating weight of approximately 23,000 pounds, the machine is designed to handle large loads while maintaining stability.

Its hydraulic system features a 39.3-gallon-per-minute pump, providing strong lifting and breakout force for heavy-duty applications. The maximum lifting capacity reaches 16,600 pounds, making it a powerful option for handling materials in construction or material handling environments.

For efficiency in operation, the 644K is equipped with a 4-speed, powershift transmission, offering smooth shifting and optimal power delivery. The system allows for a maximum travel speed of 25 mph, enhancing productivity in work sites with long distances to cover.

In terms of fuel efficiency, the John Deere 644K benefits from advanced engine technology, including a turbocharger and intercooler. This combination optimizes combustion and minimizes fuel consumption, contributing to lower operating costs without sacrificing power.

The loader features a spacious, operator-friendly cab with enhanced visibility and low noise levels, ensuring comfort during extended shifts. With an adjustable seat and easy-to-read controls, operators can maintain focus and precision in their work.

For durability, the 644K is built with high-strength steel components and reinforced axles, making it capable of withstanding the harshest environments. Maintenance is simplified with easy access to key components, helping to reduce downtime and service costs.

• Engine: 6.8-liter, 6-cylinder, 173 horsepower
• Operating Weight: 23,000 lbs
• Hydraulic Flow: 39.3 gallons per minute
• Lift Capacity: 16,600 lbs
• Transmission: 4-speed powershift
• Maximum Travel Speed: 25 mph
• Cab: Spacious, noise-reducing design with adjustable seat

Engine Performance and Power Output

The 2011 John Deere 644K is equipped with a 6.8-liter PowerTech engine, delivering a reliable balance of power and fuel efficiency. This engine produces 174 horsepower at 2,200 RPM, making it suitable for heavy-duty tasks and demanding environments.

With a torque rating of 580 lb-ft, the 644K provides the necessary strength for lifting and moving heavy loads. The engine’s high torque is key in ensuring smooth operation even in challenging conditions, such as steep inclines or when handling large materials.

For enhanced productivity, the engine is paired with an efficient cooling system, ensuring optimal performance during long hours of operation. The variable fan drive system helps maintain the engine’s temperature, preventing overheating and maintaining power output throughout the day.

Fuel efficiency is another notable feature of the 644K’s engine. The PowerTech engine is designed to minimize fuel consumption while maintaining consistent performance. This helps reduce operating costs over the long term, especially in high-usage scenarios.

Overall, the engine performance of the 2011 John Deere 644K provides a solid combination of power, efficiency, and reliability for a wide range of construction and material handling tasks.

Hydraulic System and Load Handling Capacity

The hydraulic system in the 2011 John Deere 644K is designed for high performance, offering a pump capacity of 46.2 gpm (175 L/min). This ensures smooth and consistent operation under heavy loads. The system’s pressure relief valve is set at 3,000 psi (20,684 kPa), ensuring effective handling of large and challenging materials.

When working with high-capacity loads, the 644K offers impressive lift and breakout force. With a lifting capacity of 11,048 lbs (5,013 kg) at full height, this model is capable of managing heavy-duty tasks. The bucket break-out force reaches up to 21,563 lbs (9,792 kg), making it effective for digging and material handling in demanding environments.

Additionally, the hydraulic cylinders are optimized for durability and speed, improving the machine’s responsiveness. The system is calibrated to provide precise control, making the 644K a strong performer when moving heavy materials like gravel, soil, and construction debris.

Maintaining hydraulic fluid at optimal levels is critical for preventing overheating and ensuring smooth operation under pressure. Regular checks and maintenance of the hydraulic system can extend its longevity and improve its load handling capabilities over time.

Transmission and Drive System Overview

The 2011 John Deere 644K utilizes a PowerShift transmission, offering smooth shifting and optimal performance for varying load conditions. This 4-speed transmission is paired with a torque converter, providing efficient power transfer while maintaining fuel economy.

The machine’s drivetrain incorporates a variable displacement pump that adjusts flow depending on the load, improving overall system performance. The all-wheel drive system enhances traction, allowing the 644K to handle challenging terrain with ease. The front and rear axles are equipped with sealed bearings, designed for durability in harsh environments.

For operators, the transmission system allows easy gear shifts via a fingertip-controlled lever. This simplifies operation, especially when precision is required during heavy lifting or delicate maneuvering. The combination of the PowerShift transmission and all-wheel drive ensures reliable power delivery, whether on soft ground or inclined surfaces.

Hydraulic pressure regulation is also integrated into the drivetrain, providing consistent force during load handling. The transmission system’s design reduces maintenance intervals, increasing uptime and reducing operational costs over time.