The Doosan DH220LC-7 is a high-performance medium-sized crawler excavator, widely used in construction, mining, demolition, and earthmoving projects. Equipped with an advanced engine and hydraulic system, the DH220LC-7 delivers exceptional performance across various working conditions. Its design optimizes both power and fuel efficiency while minimizing emissions to meet global environmental standards. With its superior stability and comfortable working environment, the DH220LC-7 is the ideal choice for heavy-duty and long-duration tasks.
Key Specifications

• Engine Model: Cummins QSB6.7
  
• Engine Power: 129 kW (173 hp)
  
• Operating Weight: 22,000 kg
  
• Boom Length: 3,290 mm
  
• Bucket Capacity: 0.9 m³
  
• Max Digging Depth: 6,660 mm
  
• Max Reach: 9,750 mm
  
• Max Dump Height: 6,630 mm
  
• Track Width: 600 mm
  
• Fuel Tank Capacity: 340 L
  
• Hydraulic Tank Capacity: 225 L
  
• Max Drawbar Pull: 212 kN
  
• Max Lifting Force: 18.0 kN
  

• Efficient Power System: The DH220LC-7 is powered by the Cummins QSB6.7 engine, providing strong power output and excellent fuel efficiency, ensuring stable performance under heavy-load conditions.
  
• Optimized Hydraulic System: Equipped with an advanced hydraulic system, it delivers rapid operational responses, making it highly efficient for excavation, loading, and material handling tasks, while reducing energy consumption.
  
• Operator Comfort: The spacious cabin features air conditioning, adjustable seats, and hydraulic joysticks, enhancing operator comfort and reducing fatigue during long working hours.
  
• Superior Stability: The reinforced undercarriage and high-strength tracks provide excellent stability, ensuring precise operation even in complex terrains and harsh working conditions.
  
• Environmental Performance: The DH220LC-7 meets global emission standards, utilizing eco-friendly technologies to reduce environmental impact and support sustainable operations.
  

The Kobelco SK210 is a high-performance medium-sized crawler excavator widely used in construction, mining, roadwork, and demolition projects. Equipped with an excellent power system, advanced hydraulic technology, and outstanding fuel economy, the SK210 provides reliable performance and high efficiency in various complex working environments. This model focuses on operator comfort, stability, and environmental considerations, making it an ideal choice for large-scale projects.
Key Specifications

• Engine Model: ISUZU 4HK1X
  
• Engine Power: 119 kW (160 hp)
  
• Operating Weight: 21,600 kg
  
• Boom Length: 3,470 mm
  
• Bucket Capacity: 1.0 m³
  
• Max Digging Depth: 6,700 mm
  
• Max Reach: 9,800 mm
  
• Max Dump Height: 6,760 mm
  
• Track Width: 600 mm
  
• Fuel Tank Capacity: 350 L
  
• Hydraulic Tank Capacity: 240 L
  
• Max Drawbar Pull: 216 kN
  
• Max Lifting Force: 17.5 kN
  

• Efficient Power System: The Kobelco SK210 is powered by the ISUZU 4HK1X engine, delivering strong power output and excellent fuel efficiency, ensuring stable performance in high-load conditions.
  
• Advanced Hydraulic System: The SK210 is equipped with an optimized hydraulic system, allowing it to complete large-scale earthworks and loading tasks quickly while maintaining low energy consumption and high work efficiency.
  
• Operator Comfort: The cabin is spacious and equipped with air conditioning, an adjustable seat, and joysticks, ensuring comfort and precise control during long hours of operation.
  
• Superior Stability: The reinforced undercarriage and high-strength tracks provide superior stability, ensuring safe and efficient operation even in challenging terrains and harsh working conditions.
  
• Environmental Performance: The SK210 meets international emission standards, using eco-friendly technologies to reduce emissions and minimize environmental impact, supporting sustainable operations.
  

The Kobelco SK210LC is a high-performance medium-sized crawler excavator, widely used in construction, mining, roadworks, and demolition projects. With its powerful engine, superior hydraulic performance, and excellent fuel efficiency, the SK210LC provides stable and reliable performance in a variety of complex working environments. The design is focused on improving operational efficiency, ensuring operator comfort, and maintaining safety, making it a highly reliable machine for various industries.
Key Specifications

• Engine Model: ISUZU 4HK1X
  
• Engine Power: 119 kW (160 hp)
  
• Operating Weight: 21,600 kg
  
• Boom Length: 3,470 mm
  
• Bucket Capacity: 1.0 m³
  
• Max Digging Depth: 6,700 mm
  
• Max Reach: 9,800 mm
  
• Max Dump Height: 6,760 mm
  
• Track Width: 600 mm
  
• Fuel Tank Capacity: 350 L
  
• Hydraulic Tank Capacity: 240 L
  
• Max Drawbar Pull: 216 kN
  
• Max Lifting Force: 17.5 kN
  

• Powerful Engine: The Kobelco SK210LC is equipped with the ISUZU 4HK1X engine, delivering excellent power output and fuel efficiency. It is designed to handle high-load conditions while ensuring stable performance.
  
• Efficient Hydraulic System: The excavator features an advanced hydraulic system that allows for rapid response and increased operational efficiency, making quick work of excavation and loading tasks.
  
• Operator Comfort: The spacious cabin is designed with ergonomic seats and hydraulic joysticks, reducing operator fatigue and enhancing comfort, even during long hours of operation.
  
• Exceptional Stability: The reinforced undercarriage and high-strength tracks provide superior stability, ensuring precise operations even on challenging terrains and in harsh working conditions.
  
• Environmental Performance: The SK210LC meets international emission standards, using advanced engine and eco-friendly technologies to reduce emissions and support green operations.
  

The Komatsu PC220 is a powerful and versatile medium-sized crawler excavator, widely used in construction, mining, demolition, road construction, and other industries. Equipped with an efficient engine and hydraulic system, the PC220 delivers robust performance under various working conditions. It offers excellent stability, fuel economy, and operator comfort, making it an ideal choice for large-scale earthworks and heavy-duty tasks.
Key Specifications

• Engine Model: SAA6D107E-1
  
• Engine Power: 129 kW (173 hp)
  
• Operating Weight: 22,400 kg
  
• Boom Length: 3,440 mm
  
• Bucket Capacity: 1.0 m³
  
• Max Digging Depth: 7,100 mm
  
• Max Reach: 10,210 mm
  
• Max Dump Height: 7,010 mm
  
• Track Width: 600 mm
  
• Fuel Tank Capacity: 360 L
  
• Hydraulic Tank Capacity: 230 L
  
• Max Drawbar Pull: 198 kN
  
• Max Lifting Force: 18.0 kN
  

• Efficient Power System: The PC220 is powered by the highly efficient SAA6D107E-1 engine, providing exceptional power output and fuel efficiency, ensuring stable performance even under heavy load conditions.
  
• High-Quality Hydraulic System: The advanced hydraulic technology in the PC220 allows for fast and efficient completion of large-scale earthworks, excavation, and loading tasks, while minimizing energy consumption and improving work efficiency.
  
• Operator Comfort: The spacious cabin is equipped with air conditioning, an adjustable seat, and hydraulic joysticks, ensuring a comfortable and precise working environment for operators, even during long working hours.
  
• Superior Stability: With its reinforced undercarriage and high-strength tracks, the PC220 provides exceptional stability, ensuring precise operation even in challenging terrains and harsh working conditions.
  
• Environmental Performance: The PC220 meets international emission standards, using advanced engine and environmental technologies to reduce emissions, supporting eco-friendly operations.
  

The SANY SY215C-9 is a medium-sized crawler excavator that integrates advanced technology and high-performance design, widely used in construction, mining, road construction, demolition, and other industries. With its powerful engine system, optimized hydraulic performance, and excellent fuel economy, the SY215C-9 offers stable and efficient operational capabilities. Its versatility and operator comfort make it an ideal choice for heavy-duty tasks, capable of handling a variety of complex working conditions.
Key Specifications

• Engine Model: Isuzu 4JJ1X
  
• Engine Power: 129 kW (173 hp)
  
• Operating Weight: 21,800 kg
  
• Boom Length: 3,360 mm
  
• Bucket Capacity: 1.0 m³
  
• Max Digging Depth: 6,410 mm
  
• Max Reach: 9,710 mm
  
• Max Dump Height: 6,800 mm
  
• Track Width: 600 mm
  
• Fuel Tank Capacity: 320 L
  
• Hydraulic Tank Capacity: 200 L
  
• Max Drawbar Pull: 183 kN
  
• Max Lifting Force: 16.0 kN
  

• Powerful Engine System: The SY215C-9 is equipped with an efficient Isuzu 4JJ1X engine, providing robust power output and excellent fuel efficiency, ensuring stable performance even under heavy load operations.
  
• Efficient Hydraulic System: The optimized hydraulic system enhances operational efficiency, allowing quick execution of tasks such as excavation, loading, and earthworks while reducing energy consumption.
  
• Operator Comfort: The spacious cab is equipped with air conditioning, an adjustable seat, and adjustable control levers, ensuring operator comfort during long working hours.
  
• Superior Stability: The reinforced undercarriage design enhances the overall stability of the machine, making it suitable for various complex terrains and harsh working environments, ensuring safe and precise operations.
  
• Environmental Performance: The SY215C-9 meets the latest global emission standards, using eco-friendly technology to reduce emissions, supporting green operations.
  

The Komatsu PC200 excavator is a highly efficient, medium-sized crawler excavator widely used in construction, mining, demolition, and roadworks. With its powerful engine, reliable hydraulic system, and superior fuel economy, the PC200 performs steadily in various complex working environments and can efficiently complete a variety of digging tasks. Whether for large-scale earthworks or precision operations, this excavator provides robust support.
Key Specifications

• Engine Model: SAA6D107E-1
  
• Engine Power: 115 kW (154 hp)
  
• Operating Weight: 20,600 kg
  
• Boom Length: 3,220 mm
  
• Bucket Capacity: 0.8 m³
  
• Max Digging Depth: 6,700 mm
  
• Max Reach: 9,680 mm
  
• Max Dump Height: 6,550 mm
  
• Track Width: 600 mm
  
• Fuel Tank Capacity: 330 L
  
• Hydraulic Tank Capacity: 190 L
  
• Max Drawbar Pull: 198 kN
  
• Max Lifting Force: 14.0 kN
  

• Powerful Engine: The Komatsu PC200 is equipped with the advanced SAA6D107E-1 engine, providing high output power and excellent fuel efficiency, delivering sustained power even under heavy load conditions.
  
• Efficient Hydraulic System: The PC200 features Komatsu’s innovative hydraulic system, which enables quick completion of large-scale excavation tasks while maintaining low energy consumption, improving overall work efficiency.
  
• Comfortable Operator Environment: The spacious cabin is equipped with an air-conditioning system and hydraulic joysticks, ensuring operator comfort during long working hours.
  
• Superior Stability: With a reinforced undercarriage design and high-strength tracks, the PC200 maintains excellent stability in challenging terrains and harsh working conditions, ensuring safe operations.
  
• Environmental Performance: The PC200 meets international emission standards, using advanced engine technology to reduce pollutant emissions and support eco-friendly operations.
  

The Caterpillar Cat 349D is a high-performance large crawler excavator, widely used in construction, mining, oil extraction, heavy demolition, and other large-scale engineering projects. With its powerful engine and advanced hydraulic technology, the Cat 349D offers outstanding digging force, lifting power, and operational efficiency, making it reliable even in complex and harsh working conditions. Its superior fuel economy and operator comfort make it an ideal choice for high-load tasks.
Key Specifications

• Engine Model: C9 ACERT
  
• Engine Power: 257 kW (345 hp)
  
• Operating Weight: 45,000 kg
  
• Boom Length: 5,230 mm
  
• Bucket Capacity: 1.8 m³
  
• Max Digging Depth: 7,880 mm
  
• Max Reach: 11,180 mm
  
• Max Dump Height: 8,160 mm
  
• Track Width: 700 mm
  
• Fuel Tank Capacity: 540 L
  
• Hydraulic Tank Capacity: 290 L
  
• Max Drawbar Pull: 313 kN
  
• Max Lifting Force: 22.5 kN
  

• Efficient Power System: The Cat 349D is equipped with a powerful C9 ACERT engine that delivers excellent power output and fuel efficiency, enabling stable performance in high-load conditions.
  
• Superior Hydraulic Performance: The advanced hydraulic system enhances the machine's operational efficiency, allowing for quick execution of tasks such as digging, loading, and pushing.
  
• Operator Comfort: The cab is designed for comfort, featuring an air-suspended seat, adjustable control levers, an LCD display, and an air conditioning system, ensuring a better working environment for operators.
  
• Outstanding Stability: The enhanced undercarriage and high-strength track design provide excellent stability on challenging terrain, ensuring safe and precise operations.
  
• Environmental Performance: The Cat 349D meets global emission standards, using environmentally friendly technologies to reduce emissions and minimize environmental impact.
  

The Komatsu PC130 excavator is a high-performance, medium-sized crawler excavator widely used in construction, roadwork, mining, and demolition projects. Equipped with a powerful engine and excellent hydraulic performance, it provides stable and robust working capabilities. The PC130 offers great fuel efficiency, durability, and operator comfort, making it highly suitable for medium to small-scale projects.
Key Specifications

• Engine Model: SAA4D95LE-5
  
• Engine Power: 75 kW (100 hp)
  
• Operating Weight: 13,200 kg
  
• Boom Length: 3,300 mm
  
• Bucket Capacity: 0.5 m³
  
• Max Digging Depth: 6,510 mm
  
• Max Reach: 9,220 mm
  
• Max Dump Height: 6,330 mm
  
• Track Width: 500 mm
  
• Fuel Tank Capacity: 180 L
  
• Hydraulic Tank Capacity: 140 L
  
• Max Drawbar Pull: 125 kN
  
• Max Lifting Force: 10.3 kN
  

• Efficient Power System: The Komatsu PC130 is equipped with a high-efficiency engine and hydraulic system, providing powerful digging and lifting capacity to ensure optimal performance in a variety of tasks.
  
• Fuel Economy: Thanks to the optimized engine and hydraulic technology, the PC130 is highly fuel-efficient, significantly reducing operating costs and enhancing overall efficiency.
  
• Operator Comfort: The spacious cabin is designed for operator comfort, with an air-suspended seat, adjustable control levers, and an LCD display, ensuring a pleasant and productive working environment.
  
• Excellent Stability: The PC130 features an enhanced undercarriage design that improves the machine’s stability, making it ideal for working in challenging terrains and varying conditions.
  
• Environmental Performance: It meets the latest emission standards, ensuring reduced environmental impact and compliance with green and eco-friendly requirements.
  

The Caterpillar Cat 320D excavator is a high-performance, medium-sized crawler excavator widely used in construction, mining, demolition, and roadworks. It features advanced hydraulic technology and an efficient engine, providing excellent fuel economy and powerful working capacity. The Cat 320D is designed to enhance operator comfort and work efficiency, making it ideal for jobs requiring high precision and substantial digging force.
Key Specifications

• Engine Model: C6.4 ACERT
  
• Engine Power: 127 kW (170 hp)
  
• Operating Weight: 21,400 kg
  
• Boom Length: 3,070 mm
  
• Bucket Capacity: 1.0 m³
  
• Max Digging Depth: 6,580 mm
  
• Max Reach: 9,570 mm
  
• Max Dump Height: 6,380 mm
  
• Track Width: 600 mm
  
• Fuel Tank Capacity: 400 L
  
• Hydraulic Tank Capacity: 210 L
  
• Max Drawbar Pull: 171 kN
  
• Max Lifting Force: 14.5 kN
  

• Fuel Efficiency: The Cat 320D features advanced engine and hydraulic system technologies that optimize fuel consumption, achieving a 10% improvement in fuel efficiency over its predecessors.
  
• Powerful Digging Force: With its high-powered engine and efficient hydraulic system, the Cat 320D delivers superior digging force, capable of handling various tough working conditions.
  
• Comfortable Operator Experience: The spacious cab is equipped with an air-suspended seat, adjustable control levers, and an LCD display, providing a more comfortable operating environment for the operator.
  
• Durability and Reliability: Built with durable components and high-quality materials, the Cat 320D is designed to perform reliably in harsh environments for long periods.
  
• Environmental Technology: It meets global emission standards, reducing environmental impact.
  

Today, we bring you an interview with Mr. Liang, a long-time user of the Case CX55B mini excavator. Mr. Liang is from Jixian, Tianjin, and entered the excavator industry in 2002, initially using a tractor-converted farm excavator. He recalls that the machine frequently broke down, but over time, he became familiar with the equipment's working principles, which helped him gain valuable experience for managing and operating excavators in the future. Gradually, his entire family entered the excavator rental business. Since 2004, they have purchased a variety of machines, including one Kubota, one Komatsu, and 17 Case excavators. Today, they are a significant player in the excavator rental industry.
Purchase Information
In 2004, after accumulating his first "bucket of gold" from the farm excavator, Mr. Liang and his relatives purchased a 5-ton excavator from an international brand. During use, they faced issues with the track slipping off, and when dealing with the local dealer, they felt the service was inadequate. This led them to look for an alternative, which is when they turned to the Case CX55B mini excavator. The machine’s high-quality construction and its status as an imported product caught Mr. Liang’s attention, along with the excellent service provided by the Case dealer in Beijing, who worked hard to negotiate favorable policies and discounts for them. For Mr. Liang, purchasing a machine isn’t just about the quality of the product but also the level of service provided by the dealer. After considering all factors, he chose the Case CX55B.
Operating Conditions
Mr. Liang does not have any large, fixed projects. Instead, most of his work is small-scale, including monthly contracts for municipal, telecommunications, gas, and water projects. The primary tasks involve trenching, leveling, and some occasional breaking work.
Work Efficiency
Regarding the work efficiency of the Case CX55B, Mr. Liang has received positive feedback from his clients. This performance can be attributed to three key features of the machine:

1. Zero Tail Swing
   The zero-tail swing feature of the Case CX55B has been a game-changer, especially for city jobs with limited space. While other machines with tails struggle in tight spaces, the Case CX55B excels and can work in places where others can't.
   
2. Rubber Tracks
   Mr. Liang chose rubber tracks for his machine, which helped him secure several jobs in residential areas. Steel tracks are noisy and can damage lawns and curbs, but rubber tracks minimize these issues, making the CX55B ideal for work in such environments.
   
3. Boom Offset Function
   The boom offset feature of the Case CX55B has proven very useful for trenching along walls. This feature significantly improves efficiency for municipal and telecommunications projects, which often require working in narrow or restricted spaces. This capability has given Mr. Liang a competitive edge in securing new jobs.
   

1. Air Conditioning Issues
   After 1000+ hours of use, the air conditioning system failed and could no longer cool effectively. This was problematic, especially in hot weather, as working without air conditioning in dusty environments felt unbearable. The lack of effective cooling not only reduced work efficiency but also created a safety concern for the operator.
   
2. Bucket Issues
   When Mr. Liang first purchased the Case CX55B, the bucket performed well without any issues. However, after less than 200 hours of use, cracks began to appear on the bucket. This led to some speculation about whether the bucket was made domestically. Eventually, Mr. Liang had to reinforce the bucket himself to prevent further damage.