John Deere 644D Wheel Loader Specifications and Key Features

The John Deere 644D wheel loader offers high performance with a reliable design tailored for various heavy-duty applications. It is equipped with a powerful engine and superior hydraulic capabilities, making it an excellent choice for construction, material handling, and other intensive tasks.

Engine Performance: The 644D features a 6.8L engine, providing 130 horsepower, which ensures ample power for demanding operations. The engine is paired with a torque converter and a Powershift transmission, delivering smooth and efficient power transfer to the wheels.

Lifting Capacity: With a bucket capacity of 2.5 cubic yards, the 644D is optimized for handling large loads. Its hydraulic system allows for precise control over the loader’s movements, making lifting and dumping materials easier and faster.

Dimensions and Handling: The 644D has a total length of 7,315 mm and a height of 3,710 mm. Its excellent turning radius and stability ensure that it performs well in tight spaces, while the robust tires contribute to its traction on various surfaces.

Operator Comfort: The operator’s cab is designed for comfort, offering visibility, control, and convenience. It includes air conditioning and a user-friendly control panel, enhancing productivity and reducing operator fatigue during extended use.

With these specifications, the John Deere 644D proves to be a reliable and efficient loader, capable of handling a wide range of heavy-duty tasks while ensuring operator safety and comfort.

John Deere 644D Wheel Loader Specifications

The John Deere 644D Wheel Loader is engineered for maximum performance in heavy-duty applications. With a powerful 6.8L engine, it delivers 150 horsepower, providing strong lifting capabilities and efficiency in demanding environments.

Its operating weight is approximately 18,800 kg, allowing it to handle substantial loads with ease. The loader’s bucket capacity ranges from 2.7 to 3.0 cubic meters, ensuring versatility for various materials and tasks. The machine also features a breakout force of 14,200 kg, making it ideal for digging and heavy lifting jobs.

The 644D boasts a maximum lift height of 4.4 meters and a maximum reach of 2.5 meters, which facilitates optimal material handling. Additionally, its hydraulic system offers a flow rate of 155 liters per minute, ensuring quick and efficient operation when working with attachments or performing repetitive tasks.

With an articulation angle of 40 degrees, the 644D Wheel Loader ensures excellent maneuverability in tight spaces, enhancing productivity on the job site. The loader’s transmission system, which includes a power shift transmission, provides smooth gear changes and reliable performance under various conditions.

For ease of maintenance, the machine features easy access to key components, reducing downtime and keeping maintenance costs low. The 644D is well-suited for construction, mining, and other industries requiring heavy lifting and material handling capabilities.

Engine and Performance Details of the John Deere 644D

The John Deere 644D wheel loader is powered by a 6.8L, 6-cylinder, turbocharged engine. This engine delivers 145 horsepower at 2,200 RPM, offering robust performance for heavy-duty tasks. It is designed to provide strong power while maintaining fuel efficiency, ensuring high productivity without excessive fuel consumption.

The engine is paired with a powershift transmission system that allows for smooth shifting between gears, enhancing both speed and control. With a maximum travel speed of 40 km/h (25 mph), the 644D can cover large job sites efficiently, reducing downtime and improving cycle times.

In addition to its solid powertrain, the 644D features a closed-center hydraulic system, delivering efficient operation of attachments with improved response times. The hydraulic system has a maximum flow rate of 197 L/min, providing excellent lifting and digging capabilities, making the loader highly versatile on the job site.

The combination of engine power, transmission efficiency, and hydraulic performance ensures that the 644D operates smoothly across a wide range of tasks, from material handling to excavation, all while maintaining a high level of productivity and reliability.

Hydraulic System and Load Handling Capabilities of the 644D

The John Deere 644D wheel loader features a highly efficient hydraulic system, designed to enhance load handling and increase productivity. With a system built for optimal power and performance, it ensures smooth operation even in challenging conditions.

The hydraulic system of the 644D provides:

Maximum hydraulic flow rate of 150 liters per minute (39.6 gallons per minute), ensuring fast and responsive lifting and loading.
High-pressure system operating at 210 bar (3,045 psi), delivering powerful lifting and bucket operation capabilities.
Efficient control valves, reducing hydraulic pressure losses and optimizing energy usage.

For handling heavy loads, the 644D’s hydraulic system ensures the following:

Lift capacity up to 9,100 kg (20,000 lbs) at maximum lift height, making it suitable for handling large, heavy materials.
Bucket breakout force of 11,500 kg (25,400 lbs), providing strong lifting force for tougher jobs.
Parallel lift capability that allows the operator to maintain the load’s angle while lifting, improving stability and control.

The design of the hydraulic system also incorporates advanced filtering and cooling features, enhancing system longevity and performance. Routine maintenance and inspection of hydraulic components are simplified by easy access points, ensuring minimal downtime.

Dimensions and Operational Weight of the John Deere 644D

The John Deere 644D wheel loader has a length of 8.26 meters (27 feet 1 inch) with the bucket attached, making it highly maneuverable for a machine of its class. The width of the machine stands at 2.58 meters (8 feet 6 inches), ensuring stability during operation. Its height to the top of the cab is 3.55 meters (11 feet 8 inches), giving operators a clear view from within the cabin.

The machine has a wheelbase of 3.44 meters (11 feet 3 inches), providing a solid foundation for lifting and carrying heavy loads. The ground clearance is 0.39 meters (15.3 inches), enabling it to handle rough terrain efficiently.

As for weight, the operational weight of the John Deere 644D varies based on the configuration and attachments. The standard operating weight with a full bucket is around 15,700 kilograms (34,600 lbs). This weight allows for impressive load-handling capabilities while maintaining balance and safety in demanding tasks.