Komatsu D85 Vs. CAT D7: How Do These Iconic Bulldozers Stack Up?

The Komatsu D85 and Caterpillar D7 are two of the most iconic large bulldozers ever built. Both have been around for decades and are synonymous with moving massive amounts of earth.

But how do these two heavy equipment legends really compare? Here’s a detailed look at the pros, cons, similarities and differences between the Komatsu D85 and CAT D7.

Brief Comparison Table

Feature	Komatsu D85	CAT D7
Operating Weight	49,600 lb	30,882 lb
Engine Power	205 hp	130 hp
Blade Capacity	15.7 yd3	10.5 yd3
Fuel Efficiency	Up to 10% better	Worse than D85
Production	Can be higher	Slightly lower
Visibility	Excellent	Good
Comfort	Ergonomic cab	Decent comfort
Maintenance	Easy access for maintenance	Tight engine access
Initial Cost	Higher	Lower than D85
Resale Value	Very high	Good

Overview of the Komatsu D85

The Komatsu D85 is a massive dozer designed for high production earthmoving and heavy construction work. Here are some key features and capabilities:

• 205 HP turbocharged diesel engine provides excellent power
• Low center of gravity and long track length improve stability
• Hydrostatic transmission smoothly transfers power to tracks
• Excellent drawbar pull for tackling tough ground
• Spacious, ergonomic cab with great visibility
• Large semicircular blades available from 15.7 to 17.7 yd3
• Electronically controlled power optimizes performance
• Auto-idle helps reduce idle time and save fuel
• Advanced diagnostic system simplifies maintenance

With its huge size and weight, deep ripping power, and aggressive blade, the D85 can efficiently tackle everything from ripping rocky soil to finishing pads. It’s one of the most capable production dozers on the market.

Also Read: Comparison Between Komatsu D575A and Caterpillar D11

Overview of the CAT D7

The CAT D7 has been an industry staple for heavy dozing work since the 1950s. Key attributes include:

• The 130 HP diesel engine provides good power
• Low center of gravity adds stability for sloping work
• Power shift transmission with lockup torque converter
• Excellent drawbar pull and side plate forces
• Available straight or angle blades from 10.5 to 13.4 yd3
• Cab offers good comfort and ergonomics
• Fuel efficient engine matched to torque converter
• D7E electric drive model offers better efficiency
• Simple components allow in-field repairs and service

While smaller than the D85, the venerable CAT D7 remains a highly effective dozer for clearing, backfilling, spreads, and other demanding work. It continues to deliver solid performance and reliability.

Key Differences Between Komatsu D85 and CAT D7

The D85 and D7 have some notable differences when it comes to their size, power, production rates, technology features, operator comfort and more. Here is an in-depth comparison:

• Size and Weight

Arguably, the most conspicuous difference lies in their size and weight. The Komatsu D85, tipping the scales at 49,600 pounds, outstrips the CAT D7 by nearly 20,000 pounds, with the latter’s weight standing at approximately 31,000 pounds.

The substantial mass of the D85 confers it with a distinct advantage, particularly in challenging terrains where pushing stability is pivotal. The combination of its elongated tracks and broader blade optimize production, allowing it to push and move more material efficiently.

• Engine Power

Engine power is another arena where the D85 holds a decisive edge. Equipped with a robust 205 HP engine, it significantly overshadows the D7’s 130 HP unit.

This disparity in power translates into enhanced ripping ability and expedited cycle times for the D85 when dozing and spreading soils. Although the D7 holds its ground competently, it falls short of matching the sheer power exhibited by the D85.

• Blade Capacity

Blade capacity is a critical factor in assessing the efficacy of a bulldozer. The D85 again surpasses the D7 with its colossal 15.7 cubic yard semi-U blade, as opposed to the D7’s 10.5-13.4 yard blades.

This difference enables the D85 to transport a considerably larger volume of material with each pass, thus augmenting its overall productivity.

• Technology Features

In the realm of technology, the D85 enjoys a technological advantage with features like an electronically optimized and controlled engine, hydrostatic drive train, adjustable blade pitch controls, and comprehensive diagnostic capabilities.

In contrast, the D7 adopts a simpler approach, utilizing a more basic mechanical transmission and control system. This advanced technology embedded in the D85 enhances its productivity and efficiency, making it a preferred choice for tech-savvy operators.

• Operator Comfort

Comfort is paramount for operators tasked with long hours of laborious work. The D85 scores higher in this department, offering a more spacious cab, ergonomic controls, and unrivaled visibility.

While the D7’s cab is commendable, it doesn’t quite match the comfort and spaciousness provided by the D85, potentially leading to increased fatigue over long working hours.

• Fuel Efficiency

Fuel consumption is a crucial consideration in the operational cost of bulldozers. The D85, with its electronically controlled engine and hydrostatic drive, showcases exemplary fuel economy.

It holds a nearly 10% advantage in gallons per hour compared to the D7, making it a more economically viable option in the long run.

• Maintenance and Serviceability

Maintenance access is somewhat constrained on the D7, particularly around the engine area. Conversely, the D85 boasts a design that facilitates easy access to service points, thereby minimizing downtime.

However, the D7 gains a slight edge in terms of long-term parts and service availability, courtesy of Caterpillar’s extensive dealer network.

• Upfront Cost and Total Ownership Cost

Financial considerations play a pivotal role in the decision-making process. The D85 typically commands a higher initial investment, sometimes exceeding the D7 by $100,000 or more, depending on the configurations.

However, when evaluating the total cost of ownership over the lifespan of the machines, the financial outlay can be comparable between the two dozers.

Also Watch This Review Video:

Pros and Cons of the Komatsu D85

Pros

• Huge power and productivity from 205 HP engine
• Massive blade capacity up to 17.7 yd3
• Excellent fuel efficiency for large dozer
• Superior operator comfort and visibility
• Advanced electronic engine/transmission controls
• Easy maintenance access reduces downtime
• Excellent resale value holds value well

Cons

• Very expensive purchase price
• Large size limits transport flexibility
• Heavy weight impacts ground disturbance
• Complex systems require technician diagnostics
• Not as good parts/service availability as CAT

Pros and Cons of the CAT D7

Pros

• Proven reliability and durability
• Large global dealer support network
• Familiar, intuitive controls simplify operation
• Good fuel economy for engine size
• Low operating costs benefit total cost
• Readily available parts and service
• Costs less than D85 in most cases

Cons

• Less total power and blade capacity
• Slightly higher fuel consumption
• Tighter access for maintenance
• Less advanced technology features
• Smaller cab with decent comfort

Frequently Asked Questions (FAQs)

Final Thoughts

The Komatsu D85 and CAT D7 represent two of the top choices for large, production-sized dozers. While the D85 has greater size, power, and capacity, the venerable D7 remains a strong performer with excellent support.

Companies seeking maximum production in tough soil may benefit most from the D85. Owner-operators wanting a durable, reasonably priced large dozer can’t go wrong with the D7.

By understanding their comparative strengths and weaknesses, buyers can select the best option for their needs. Both machines have earned their reputations through decades of proven performance moving earth.