Tire and Wheel Size Differences Between Lull 644 and Lull 844S Telehandlers

[MikePhua]

When it comes to heavy equipment like telehandlers, one of the essential components to consider is the tires and wheels. Not only do they impact the machine’s performance, but they also affect its maneuverability, stability, and load-bearing capacity. Two popular models in the Lull telehandler lineup—the 644 and the 844S—are often compared by operators who need to choose between them or replace their tires. This article explores the differences between the Lull 644 and Lull 844S tires and wheels, providing insights into their specifications, compatibility, and impact on overall machine performance.
Overview of the Lull Telehandler Models
Lull telehandlers are a staple in the construction and material handling industries, known for their powerful lifting capabilities and rugged versatility. Manufactured by JLG Industries, Lull telehandlers are designed for rough terrain applications, offering extended reach and superior lifting height, especially for challenging construction sites or agricultural tasks.

• Lull 644 Telehandler:
  The Lull 644 is a mid-range model, featuring a lift capacity of 6,000 pounds and a maximum lift height of 44 feet. The machine is designed with heavy-duty tires and a robust axle system, making it suitable for a variety of tasks including lifting materials, placing heavy equipment, and navigating rough terrain. Its size and tire specifications are balanced for applications that require a combination of reach and stability.
  
• Lull 844S Telehandler:
  The Lull 844S, on the other hand, is a larger and more powerful version, capable of handling higher capacities and lifting heavier loads. It offers a maximum lift capacity of 8,000 pounds and a maximum reach height of 44 feet. This makes the 844S particularly suited for larger, more demanding tasks where higher load-bearing capabilities are needed, especially in construction environments where large materials are regularly lifted.
  

Tire and Wheel Size Comparison
One of the most important distinctions between the Lull 644 and 844S telehandlers is the size of their tires and wheels. While both machines offer similar lift heights, the differences in their size, weight, and lifting capacity are reflected in the specifications of their tires and wheels.

1. Lull 644 Tire Specifications:
   • Tire Type: Typically, the Lull 644 uses a 16.5 x 24 tire size.
     
   • Tire Pressure: The recommended tire pressure for these tires is typically between 35-45 psi, depending on the load and terrain.
     
   • Wheel Size: The wheels on the 644 telehandler are designed to fit 16.5-inch wide rims.
     
   • Application: These tires are designed for general-purpose use, offering a balance between traction, durability, and comfort. They are capable of handling moderately rough terrains and provide good stability under load.
     
2. Lull 844S Tire Specifications:
   • Tire Type: The 844S uses a 20 x 25 tire size, which is significantly larger than that of the 644 model.
     
   • Tire Pressure: The tire pressure for the Lull 844S typically falls within the range of 40-50 psi.
     
   • Wheel Size: The wheels for the 844S accommodate 20-inch rims.
     
   • Application: Given the larger size of these tires, they provide enhanced stability and traction, making the 844S more suited to carrying heavier loads and operating in more challenging terrains.
     

Impact on Performance
The difference in tire size between the Lull 644 and 844S directly affects the overall performance and handling characteristics of each machine. Below are some of the key performance considerations related to their tire and wheel sizes:

1. Traction and Stability:
   Larger tires, like those on the 844S, offer more surface area contact with the ground, which results in better traction, especially in soft or uneven surfaces. This is crucial for heavy-duty applications where stability is paramount. In comparison, the 644’s smaller tires provide adequate traction but are more suited to lighter loads and smoother terrain.
   
2. Load-Bearing Capacity:
   The larger tires of the 844S are designed to handle the increased load capacity of the machine. The bigger tires help distribute the weight more evenly, reducing the risk of damage to the wheels and the ground surface. The 644, with its smaller tires, is more suited to handling moderate loads but may struggle with extremely heavy weights or rough terrain.
   
3. Maneuverability:
   Smaller tires generally provide better maneuverability, especially when navigating tight spaces. The 644 telehandler, with its smaller tires, is more nimble and easier to maneuver around construction sites with narrow pathways or obstacles. On the other hand, the larger tires of the 844S, while providing more stability, can make the machine less agile, especially in confined areas.
   
4. Ride Comfort:
   Larger tires often provide a smoother ride, as they are better at absorbing shock and vibration. This can improve operator comfort, particularly in rough terrains where a bumpy ride can be taxing. The 844S’s bigger tires help cushion the machine against uneven ground, reducing wear and tear on the machine and the operator. The 644, with its smaller tires, may not provide the same level of comfort when working on rough terrain.
   

Compatibility and Conversion Considerations
Operators sometimes ask whether it’s possible to swap tires between different telehandler models, such as replacing the 644’s smaller tires with the larger ones used on the 844S. While this may seem like an easy fix to enhance stability or load capacity, there are several factors to consider:

1. Tire Fitment:
   The wheel rims of the Lull 644 and 844S are different sizes, which means that simply swapping out the tires may not be feasible without replacing the entire wheel assembly. The 644 uses 16.5-inch rims, while the 844S requires 20-inch rims, making direct interchangeability impossible.
   
2. Load Distribution:
   Even if the larger tires could be mounted on the smaller rims of the 644, they would not offer the same load distribution benefits, as the tire and rim sizes must be optimized for the specific load capacity of the machine. Using tires that are too large for the machine could lead to instability, uneven weight distribution, and potential damage to the axles.
   
3. Manufacturer’s Recommendations:
   Always follow the manufacturer’s recommended tire sizes and specifications. These recommendations are based on the design and engineering of the machine and ensure that the telehandler operates safely and efficiently. Using non-approved tires can compromise safety, performance, and warranty coverage.
   

Conclusion
The Lull 644 and 844S telehandlers are designed for different capacities and applications, and their tire and wheel specifications reflect these differences. The Lull 644, with its smaller tires, is optimized for lighter, more nimble tasks, while the 844S, with its larger tires, provides enhanced stability and load-bearing capacity for more demanding applications. Understanding these differences is key when selecting or replacing tires for these machines, as using the correct tire size ensures optimal performance, safety, and longevity.
For operators considering upgrading or replacing tires, it’s crucial to consult with equipment dealers and follow the manufacturer’s specifications to maintain machine integrity and performance. Proper maintenance of tires, along with other critical components, will help ensure that Lull telehandlers continue to perform at their best on construction sites and in other heavy-duty environments.