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High Drive vs. Conventional Track Design
One of the most visible differences in Caterpillar dozers, especially in the D4 to D6 range, is the high drive undercarriage. This design elevates the final drive above the track frame, reducing shock loads and improving component longevity. High drive systems also simplify transmission and differential service, as the assemblies are more accessible. However, they can be less stable on steep slopes due to a higher center of gravity.
John Deere dozers typically use a conventional track layout, which offers better balance on inclines and is simpler to maintain in some cases. For farm applications involving pad leveling and log skidding, high drive may offer durability advantages, but conventional tracks provide better slope handling and lower initial cost.
Transmission Reliability and Hydrostatic Performance
Deere’s hydrostatic transmission systems, especially in the 450 and 550 series, have faced criticism for reliability issues. Operators have reported sluggish response and difficulty pushing full blades under load. While newer models like the 850J WLT have improved performance, smaller units may still underperform compared to mechanical drive systems.
Caterpillar’s powertrain, particularly in the D5K and D6N, uses electronically controlled torque converters and planetary gearboxes. These systems are known for consistent pushing power and smoother transitions. CAT also offers rebuilt exchange components at lower cost, making long-term maintenance more predictable.
Parts Availability and Long-Term Support
CAT has a global parts network and continues to support machines decades after production ends. Even older D6D and D5H models have parts readily available through dealers or remanufacturing programs. Deere, by contrast, often discontinues components earlier, leaving owners to search for aftermarket or NOS (new old stock) parts.
For a farm-based operation with limited downtime tolerance, CAT’s parts ecosystem is a major advantage. Deere may be more convenient if the dealer is closer, but long-term support favors CAT.
Size Comparison Between D4, D5, and D6
Winch vs. Drawbar for Log Skidding
While a winch adds versatility, especially for lifting log butts and navigating tight terrain, many operators successfully skid logs using a drawbar alone. A well-balanced dozer with good traction can pull substantial loads without a winch. However, for steep terrain or precision placement, a winch is recommended.
Terminology Notes
In a 2010 basement excavation demo, a CAT D5K consistently outperformed a Deere 650J in both speed and blade capacity. Operators swapped machines and roles, confirming the CAT’s advantage in every configuration. Another contractor replaced a D6D with a Deere 850J but noted that while the hydrostatic drive was smoother, the CAT had better blade power and parts support.
Recommendations for Buyers
For farm use involving log skidding and pad leveling, a CAT D5 or D6 offers durability, parts access, and consistent performance. Deere machines may be more accessible locally, but long-term support and transmission reliability favor CAT. Choosing the right size and configuration depends on terrain, transport logistics, and budget—but for most operators, the extra weight and power of a D6 pays off in productivity.
One of the most visible differences in Caterpillar dozers, especially in the D4 to D6 range, is the high drive undercarriage. This design elevates the final drive above the track frame, reducing shock loads and improving component longevity. High drive systems also simplify transmission and differential service, as the assemblies are more accessible. However, they can be less stable on steep slopes due to a higher center of gravity.
John Deere dozers typically use a conventional track layout, which offers better balance on inclines and is simpler to maintain in some cases. For farm applications involving pad leveling and log skidding, high drive may offer durability advantages, but conventional tracks provide better slope handling and lower initial cost.
Transmission Reliability and Hydrostatic Performance
Deere’s hydrostatic transmission systems, especially in the 450 and 550 series, have faced criticism for reliability issues. Operators have reported sluggish response and difficulty pushing full blades under load. While newer models like the 850J WLT have improved performance, smaller units may still underperform compared to mechanical drive systems.
Caterpillar’s powertrain, particularly in the D5K and D6N, uses electronically controlled torque converters and planetary gearboxes. These systems are known for consistent pushing power and smoother transitions. CAT also offers rebuilt exchange components at lower cost, making long-term maintenance more predictable.
Parts Availability and Long-Term Support
CAT has a global parts network and continues to support machines decades after production ends. Even older D6D and D5H models have parts readily available through dealers or remanufacturing programs. Deere, by contrast, often discontinues components earlier, leaving owners to search for aftermarket or NOS (new old stock) parts.
For a farm-based operation with limited downtime tolerance, CAT’s parts ecosystem is a major advantage. Deere may be more convenient if the dealer is closer, but long-term support favors CAT.
Size Comparison Between D4, D5, and D6
- D4: Typically 18,000–20,000 lbs, suited for light grading and finish work.
- D5: Around 21,000–24,000 lbs, offering a balance of power and maneuverability.
- D6: 35,000–45,000 lbs depending on configuration, ideal for heavy pushing and large pad construction.
Winch vs. Drawbar for Log Skidding
While a winch adds versatility, especially for lifting log butts and navigating tight terrain, many operators successfully skid logs using a drawbar alone. A well-balanced dozer with good traction can pull substantial loads without a winch. However, for steep terrain or precision placement, a winch is recommended.
Terminology Notes
- High Drive: An elevated final drive system that isolates shock and simplifies maintenance.
- Hydrostatic Transmission: A fluid-based drive system offering variable speed and direction control.
- Drawbar Pull: The horizontal force a machine can exert to tow or drag loads.
In a 2010 basement excavation demo, a CAT D5K consistently outperformed a Deere 650J in both speed and blade capacity. Operators swapped machines and roles, confirming the CAT’s advantage in every configuration. Another contractor replaced a D6D with a Deere 850J but noted that while the hydrostatic drive was smoother, the CAT had better blade power and parts support.
Recommendations for Buyers
- Avoid DEF and EGR Models: Machines built before emissions systems were mandated (pre-2014) are simpler and more reliable.
- Set a Realistic Budget: Quality used dozers in the D5–D6 range often cost $50,000–$85,000. Dealer units may offer warranties and service history.
- Rent Before Buying: For occasional use, renting a dozer can complete jobs without long-term commitment or financial risk.
For farm use involving log skidding and pad leveling, a CAT D5 or D6 offers durability, parts access, and consistent performance. Deere machines may be more accessible locally, but long-term support and transmission reliability favor CAT. Choosing the right size and configuration depends on terrain, transport logistics, and budget—but for most operators, the extra weight and power of a D6 pays off in productivity.
