Comparing the Caterpillar D6R XW Series II and John Deere 850J LGP Crawler Dozers

[MikePhua]

Introduction
When evaluating medium-sized crawler dozers for demanding construction tasks, the Caterpillar D6R XW Series II and the John Deere 850J LGP are two prominent models that often come under comparison. Each offers unique features tailored to specific operational needs. This article delves into a detailed comparison of these two machines, examining their specifications, performance, and suitability for various applications.
Caterpillar D6R XW Series II Overview
The Caterpillar D6R XW Series II is a high-track, wide-gauge crawler dozer designed for heavy-duty applications requiring enhanced stability and flotation. Its specifications include:

• Engine: Caterpillar C9, 213 hp (159 kW)
  
• Operating Weight: 40,400 lbs (18,322 kg)
  
• Blade Capacity: 5.7 m³
  
• Ground Pressure: 6.5 psi (45 kPa)
  
• Track Gauge: 6.67 ft (2.03 m)
  
• Length with Blade: 17.82 ft (5.43 m)
  
• Width Over Tracks: 8.99 ft (2.74 m)
  
• Height to Top of Cab: 10.5 ft (3.20 m)
  
• Length of Track on Ground: 9.26 ft (2.82 m)
  
• Ground Clearance: 1.26 ft (0.38 m)
  
• Length without Blade: 13.39 ft (4.08 m)
  

The D6R XW Series II is equipped with a high-track undercarriage, providing increased ground clearance and improved stability on uneven terrains. Its wide-gauge design enhances flotation, making it suitable for soft or marshy conditions. The machine's powerful engine and robust blade capacity enable efficient material handling and earthmoving operations.
John Deere 850J LGP Overview
The John Deere 850J LGP is a low-ground-pressure crawler dozer engineered for applications where minimizing ground disturbance is crucial. Its specifications include:

• Engine: John Deere PowerTech 6068, 205 hp (152 kW)
  
• Operating Weight: 45,375 lbs (20,577 kg)
  
• Blade Capacity: Varies based on configuration
  
• Ground Pressure: Approximately 4.6 psi (31.7 kPa)
  
• Track Gauge: Varies based on configuration
  
• Length with Blade: Varies based on configuration
  
• Width Over Tracks: Varies based on configuration
  
• Height to Top of Cab: Varies based on configuration
  
• Length of Track on Ground: Varies based on configuration
  
• Ground Clearance: Varies based on configuration
  
• Length without Blade: Varies based on configuration
  

The 850J LGP features a low-ground-pressure design, reducing soil compaction and making it ideal for sensitive environments such as wetlands and agricultural lands. Its powerful engine and advanced hydrostatic transmission system provide smooth and responsive operation, enhancing productivity.
Performance Comparison

• Engine Power: The John Deere 850J LGP offers a higher horsepower rating at 205 hp compared to the Caterpillar D6R XW Series II's 213 hp. However, the D6R's higher operating weight may contribute to greater traction and pushing power.
  
• Ground Pressure: The 850J LGP's lower ground pressure of approximately 4.6 psi allows it to operate in softer soils with minimal ground disturbance, whereas the D6R XW Series II's 6.5 psi is more suited for firmer terrains.
  
• Undercarriage Design: The D6R XW Series II's high-track undercarriage provides increased ground clearance and stability on uneven terrains, while the 850J LGP's low-ground-pressure design minimizes soil compaction.
  

Suitability for Applications

• Caterpillar D6R XW Series II: Ideal for heavy-duty applications such as road construction, land clearing, and mining operations where enhanced stability and flotation are required.
  
• John Deere 850J LGP: Suited for applications in sensitive environments like wetlands, agricultural lands, and reclamation projects where minimizing ground disturbance is essential.
  

Conclusion
Both the Caterpillar D6R XW Series II and the John Deere 850J LGP are formidable machines in their own right, each tailored to specific operational needs. The D6R XW Series II excels in heavy-duty applications requiring enhanced stability and flotation, while the 850J LGP is designed for sensitive environments where minimizing ground disturbance is crucial. Choosing between these models depends on the specific requirements of the job site and the nature of the tasks at hand.