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Komatsu’s Legacy in Heavy Excavation
Founded in 1921 in Komatsu City, Japan, Komatsu Ltd. has grown into one of the world’s largest manufacturers of construction and mining equipment. Known for its engineering precision and durability, Komatsu has consistently pushed the boundaries of hydraulic excavator design. The PC750-6, introduced in the late 1990s, was part of Komatsu’s push into the 70–80 ton class, offering a robust alternative to Caterpillar’s 345CL and Hitachi’s EX750 series.
While exact global sales figures for the PC750-6 remain proprietary, industry estimates suggest that Komatsu sold over 10,000 units worldwide before transitioning to the PC800 series. The PC750-6 was particularly popular in North America and Southeast Asia, where its balance of power and versatility made it a favorite for quarrying, large-scale earthmoving, and pit operations.
Core Specifications and Capabilities
The Komatsu PC750-6 is a 75-ton class hydraulic excavator designed for demanding environments. Key specifications include:
Bucket Selection and Material Considerations
One of the most debated aspects of operating the PC750-6 is bucket sizing. In sandy environments, operators have successfully used 7 to 8 cubic yard buckets without compromising stability. Sandy soil, with a bulk density of approximately 1.5 tons per cubic yard, allows for larger buckets due to lower resistance and easier breakout force.
In contrast, wet clay presents a challenge. With a density closer to 2.2 tons per cubic yard and a tendency to cling to bucket surfaces, oversized buckets can lead to inefficient loading and transport issues. One operator in Louisiana noted that clay chunks often retained the exact shape of the bucket, making it difficult to fit into standard dump trucks. His solution was to use a 72-inch bucket for clay and a 96-inch bucket for sand, switching based on pit conditions.
Power vs. Counterweight Dynamics
Bucket size is not solely determined by engine power. It’s a balance between hydraulic force, counterweight mass, and structural integrity. The PC750-6 has ample horsepower to drive large buckets through loose material, but lifting a full 8-yard clay load requires rear ballast and boom strength. Operators often underestimate the role of counterweight in maintaining machine stability during lift cycles.
A seasoned operator from Pennsylvania explained that manufacturers typically recommend bucket sizes based on material density and lift capacity. However, field experience often leads to modifications. He advised adding one cubic yard to the manufacturer’s recommendation for sandy pits, provided the machine’s rear end can handle the load.
Transition to the PC800 Series
Komatsu eventually phased out the PC750-6 in favor of the PC800LC-8, which introduced several upgrades:
Dealer Support and Regional Preferences
In regions where Komatsu dealers are proactive, operators often receive tailored service and parts support. One contractor in South Dakota noted that while Caterpillar dominated the market, his local Komatsu dealer offered “out-of-the-ordinary” service, including expedited parts delivery and custom bucket fabrication. This level of support can influence purchasing decisions, especially in areas where big machines are rare.
Interestingly, in parts of Louisiana, few contractors use machines over the PC400 class. The PC750-6 stands out as a bold choice, often attracting attention for its size and capability. Operators who invest in such machines typically run multiple pits or handle high-volume excavation contracts.
Recommendations for Prospective Buyers
For those considering a used PC750-6, here are practical suggestions:
Stories from the Field
One operator shared a story of restoring a 750-6 that had sat idle for five years. After replacing hydraulic seals, rebuilding the swing motor, and fabricating a custom 7-yard spade nose bucket, the machine returned to full service in a sand pit. It now moves over 1,200 cubic yards per day, outperforming newer models in terms of reliability and fuel consumption.
Another contractor in Alberta runs a fleet of twelve PC750-6 units, each equipped with 6-yard spade buckets. He claims that while newer machines offer more tech, the 750-6 remains his workhorse due to its simplicity and ease of repair.
Conclusion
The Komatsu PC750-6 is more than just a heavy excavator—it’s a symbol of rugged reliability and field adaptability. Whether digging in sandy loam or battling sticky clay, it offers the power and precision needed for serious earthmoving. While newer models bring digital enhancements, the 750-6 continues to earn respect for its mechanical integrity and operator-friendly design.
For those willing to invest in maintenance and smart bucket selection, the PC750-6 remains a formidable ally in the dirt-moving business.
Founded in 1921 in Komatsu City, Japan, Komatsu Ltd. has grown into one of the world’s largest manufacturers of construction and mining equipment. Known for its engineering precision and durability, Komatsu has consistently pushed the boundaries of hydraulic excavator design. The PC750-6, introduced in the late 1990s, was part of Komatsu’s push into the 70–80 ton class, offering a robust alternative to Caterpillar’s 345CL and Hitachi’s EX750 series.
While exact global sales figures for the PC750-6 remain proprietary, industry estimates suggest that Komatsu sold over 10,000 units worldwide before transitioning to the PC800 series. The PC750-6 was particularly popular in North America and Southeast Asia, where its balance of power and versatility made it a favorite for quarrying, large-scale earthmoving, and pit operations.
Core Specifications and Capabilities
The Komatsu PC750-6 is a 75-ton class hydraulic excavator designed for demanding environments. Key specifications include:
- Operating weight: Approximately 75,000 kg (165,000 lbs)
- Engine: Komatsu SAA6D170E-2, 502 kW (673 HP)
- Bucket capacity: Typically ranges from 4.5 to 8 cubic yards depending on material density
- Stick length: Common configurations include 12-foot and 14-foot sticks
- Hydraulic system: Closed-center load-sensing system for efficient power distribution
Bucket Selection and Material Considerations
One of the most debated aspects of operating the PC750-6 is bucket sizing. In sandy environments, operators have successfully used 7 to 8 cubic yard buckets without compromising stability. Sandy soil, with a bulk density of approximately 1.5 tons per cubic yard, allows for larger buckets due to lower resistance and easier breakout force.
In contrast, wet clay presents a challenge. With a density closer to 2.2 tons per cubic yard and a tendency to cling to bucket surfaces, oversized buckets can lead to inefficient loading and transport issues. One operator in Louisiana noted that clay chunks often retained the exact shape of the bucket, making it difficult to fit into standard dump trucks. His solution was to use a 72-inch bucket for clay and a 96-inch bucket for sand, switching based on pit conditions.
Power vs. Counterweight Dynamics
Bucket size is not solely determined by engine power. It’s a balance between hydraulic force, counterweight mass, and structural integrity. The PC750-6 has ample horsepower to drive large buckets through loose material, but lifting a full 8-yard clay load requires rear ballast and boom strength. Operators often underestimate the role of counterweight in maintaining machine stability during lift cycles.
A seasoned operator from Pennsylvania explained that manufacturers typically recommend bucket sizes based on material density and lift capacity. However, field experience often leads to modifications. He advised adding one cubic yard to the manufacturer’s recommendation for sandy pits, provided the machine’s rear end can handle the load.
Transition to the PC800 Series
Komatsu eventually phased out the PC750-6 in favor of the PC800LC-8, which introduced several upgrades:
- Improved fuel efficiency via Tier 3 emissions compliance
- Enhanced cab ergonomics and visibility
- Advanced hydraulic control with electronic feedback loops
- Increased lift capacity and breakout force
Dealer Support and Regional Preferences
In regions where Komatsu dealers are proactive, operators often receive tailored service and parts support. One contractor in South Dakota noted that while Caterpillar dominated the market, his local Komatsu dealer offered “out-of-the-ordinary” service, including expedited parts delivery and custom bucket fabrication. This level of support can influence purchasing decisions, especially in areas where big machines are rare.
Interestingly, in parts of Louisiana, few contractors use machines over the PC400 class. The PC750-6 stands out as a bold choice, often attracting attention for its size and capability. Operators who invest in such machines typically run multiple pits or handle high-volume excavation contracts.
Recommendations for Prospective Buyers
For those considering a used PC750-6, here are practical suggestions:
- Inspect hydraulic lines and cylinders for wear, especially on older units
- Verify counterweight integrity and mounting bolts
- Test lift capacity with full bucket loads in both sandy and clay conditions
- Consider dual bucket setups to optimize for material type
- Evaluate dealer support and parts availability in your region
Stories from the Field
One operator shared a story of restoring a 750-6 that had sat idle for five years. After replacing hydraulic seals, rebuilding the swing motor, and fabricating a custom 7-yard spade nose bucket, the machine returned to full service in a sand pit. It now moves over 1,200 cubic yards per day, outperforming newer models in terms of reliability and fuel consumption.
Another contractor in Alberta runs a fleet of twelve PC750-6 units, each equipped with 6-yard spade buckets. He claims that while newer machines offer more tech, the 750-6 remains his workhorse due to its simplicity and ease of repair.
Conclusion
The Komatsu PC750-6 is more than just a heavy excavator—it’s a symbol of rugged reliability and field adaptability. Whether digging in sandy loam or battling sticky clay, it offers the power and precision needed for serious earthmoving. While newer models bring digital enhancements, the 750-6 continues to earn respect for its mechanical integrity and operator-friendly design.
For those willing to invest in maintenance and smart bucket selection, the PC750-6 remains a formidable ally in the dirt-moving business.
We sell 3 types：
1. Brand-new excavators.
2. Refurbished excavators for rental business, in bulk.
3. Excavators sold by original owners
https://www.facebook.com/ExcavatorSalesman
https://www.youtube.com/@ExcavatorSalesman
Whatsapp/Line: +66989793448 Wechat: waji8243
1. Brand-new excavators.
2. Refurbished excavators for rental business, in bulk.
3. Excavators sold by original owners
https://www.facebook.com/ExcavatorSalesman
https://www.youtube.com/@ExcavatorSalesman
Whatsapp/Line: +66989793448 Wechat: waji8243
