As demand for excavators increases among homeowners and small-scale projects, many beginners are exploring the possibility of purchasing mini or compact excavators. These machines are ideal for tasks such as land grading, gardening, pond digging, and other similar projects. This article combines user experiences to share insights on buying mini excavators and offers practical tips for beginners.
Key Considerations When Choosing a Mini Excavator
For first-time buyers, selecting the right mini excavator is essential. The key factors to consider include the machine's size, power, suitability for the work environment, and budget. User feedback indicates that many beginners initially don’t fully understand the machine’s capabilities and later realize that the choice of equipment directly affects both work efficiency and results.
For beginners, the ideal mini excavator should be able to handle daily tasks without being overly complicated to operate. Excavators in the 1-2 ton range are often suited for residential projects or landscaping, while larger machines are designed for heavy-duty industrial tasks.
Key Features of Mini Excavators

1. Ease of Operation: Beginners often prioritize ease of operation. Modern mini excavators are typically equipped with advanced control systems that allow users to quickly familiarize themselves with the equipment. By adjusting levers, operators can easily perform various tasks such as digging, lifting, and pushing.
   
2. Versatility: Many mini excavators are designed to be compact, making them ideal for working in confined spaces. For example, zero tail swing designs allow the excavator to rotate more freely in tight areas without hitting surrounding objects. For landscaping, garden work, and small construction projects, a compact and agile machine is preferable.
   
3. Power and Efficiency: Despite their small size, many mini excavators offer excellent power and fuel efficiency. Choosing a machine with the right horsepower ensures it can perform well in various working conditions. For example, 1-2 ton mini excavators are typically powerful enough to handle light to medium digging tasks while maintaining low fuel consumption.
   
4. Maintenance and Care: Regular maintenance is crucial for the long-term use of any excavator. New users often overlook this aspect, but proper maintenance can greatly extend the machine's lifespan and reduce the frequency of breakdowns. Regularly checking the hydraulic system, cleaning filters, and inspecting tracks are all essential tasks.
   

• Land Grading and Digging: Excavators are perfect for land excavation, especially for landscaping, garden design, or infrastructure construction. Mini excavators are often used to dig small ponds or clear land for roadways.
  
• Earthmoving: Tasks like soil filling, moving dirt, and pushing earth are ideal for mini excavators. Their excellent digging depth and stability make them a top choice for small-scale earthmoving projects.
  
• Landscaping and Garden Modification: Mini excavators are commonly used in gardening and landscape modifications. They can easily navigate complex terrain, completing tasks like soil excavation, leveling, and clean-up, making them ideal for residential gardens or small landscaping projects.
  

When it comes to purchasing a mini excavator, especially for those new to the industry, the process can be overwhelming due to the wide variety of options available. A common dilemma for first-time buyers is choosing between the Kubota KX and U Series mini excavators. Both are popular in the industry, but understanding the key differences and considerations will help you make an informed decision.
Understanding Mini Excavators: KX vs U Series
Kubota’s mini excavators are highly regarded for their reliability, performance, and ease of use. The KX and U Series are the two primary categories of Kubota’s mini excavators. Each series is designed for different kinds of jobs and work environments, so understanding the differences is crucial before making a purchase.
Kubota KX Series
The Kubota KX Series is well-known for its impressive power and lifting capabilities. These excavators are often preferred for more heavy-duty operations, especially when lifting and digging are the primary tasks. Key features include:

• Power and Performance: The KX Series is equipped with larger engines, making it more powerful compared to the U Series. It’s ideal for demanding tasks such as lifting heavy materials and deeper digging.
  
• Longer Reach: With longer arms and more extensive reach, the KX Series offers a higher level of versatility for digging in tight or confined spaces.
  
• Greater Stability: These excavators are designed with a wider stance, providing better stability when lifting heavy materials or working on uneven terrain.
  

• Compact Design: The U Series is more compact, making it perfect for urban or residential construction sites where space is tight. They are easier to maneuver in confined spaces and provide excellent control when working in restricted areas.
  
• Zero Tail Swing: One of the defining features of the U Series is the zero tail swing design. This allows the excavator to rotate within its own width, making it ideal for working in tight spaces without risking damage to nearby objects.
  
• Versatility: Despite its smaller size, the U Series offers a good balance of performance and maneuverability, making it a versatile option for a variety of tasks, including landscaping and utility work.
  

1. Job Requirements: Think about the type of work you'll be doing. If you primarily need an excavator for heavy lifting and deep digging, the KX Series might be a better fit. However, if you're dealing with more compact jobs and need to navigate tight spaces, the U Series could be the ideal choice.
   
2. Size and Maneuverability: Consider the size of the machine and how easily it can move around the worksite. Smaller jobs with restricted space benefit from the compact design of the U Series, while larger projects can take advantage of the power and reach of the KX Series.
   
3. Comfort and Ease of Use: For first-time users, the ease of operation is a critical factor. Kubota's machines are known for their user-friendly controls, but some people may prefer the feel of one series over the other. If possible, test both models to see which one offers the most comfortable operation for your needs.
   
4. Maintenance and Longevity: Both Kubota series are built to last, but regular maintenance is key to maximizing the lifespan of any equipment. Research the maintenance schedules for both series and consider how easily parts are accessible for servicing.
   
5. Cost and Budget: Price is always an important consideration. Generally, the KX Series will be more expensive due to its greater capabilities, while the U Series will be more affordable for those on a budget. Factor in not just the initial cost, but also the long-term maintenance and fuel efficiency of the machine.
   

Nissan excavators have gained widespread use in many construction sites due to their reliability and efficiency. However, like any heavy machinery, they may experience some issues over time, especially with prolonged use. Timely maintenance and understanding common problems can ensure the equipment performs optimally and lasts longer.
Common Issues with Nissan Excavators

1. Engine Starting Problems
   Engine starting issues are common in many excavators. Typically, problems arise due to a weak battery, starter motor failure, or fuel system issues. In colder climates, low temperatures can also affect engine start-up. Therefore, it's crucial to inspect the fuel system and battery regularly, especially in cold weather.
   
2. Hydraulic System Failures
   The hydraulic system is vital for the operation of the excavator. Hydraulic system failures, such as oil leaks, low oil levels, or damaged hoses, can severely affect the performance. Symptoms of hydraulic issues include slow or erratic arm movements. Regular checks of hydraulic oil levels and quality are essential to ensure the system runs smoothly.
   
3. Electrical Failures
   Electrical system failures are another common problem with Nissan excavators. Issues such as abnormal dashboard readings, circuit failures, or faulty sensors often occur due to aging wires, poor connections, or battery problems. Regular electrical system checks and cleaning of electrical components can help prevent such failures.
   
4. Overheating of Cooling System
   Excavators, particularly in hot environments, can suffer from cooling system overheating. This is often caused by insufficient coolant, blocked radiators, or faulty fans. Overheating not only affects performance but can also lead to engine damage. Periodic inspection of the cooling system and ensuring adequate coolant levels is crucial, especially in hot climates.
   
5. Wear and Tear of Undercarriage
   The undercarriage and tracks of the excavator are prone to wear, especially in rough, muddy, or rocky terrains. If not cleaned regularly, mud and debris can cause excessive wear on the tracks, affecting mobility. Keeping the undercarriage clean and inspecting the tracks for wear is essential for maintaining optimal performance.
   

1. Regular Oil and Filter Changes
   Regularly changing the oil and filters is vital for maintaining engine and hydraulic system performance. Poor oil quality can cause system malfunctions. It is recommended to replace the oil and filters at regular intervals or after a certain number of working hours.
   
2. Monitor Hydraulic System Health
   Hydraulic oil quality is directly linked to the performance of the hydraulic system. Check the oil levels regularly, and ensure that there is no water or contamination. If the oil appears emulsified (milky), it indicates water ingress, and the oil and filters should be changed immediately.
   
3. Keep the Electrical System Clean
   Regularly inspect the electrical system, including checking the battery levels and the condition of the wiring. Clean connections and avoid poor contact to reduce the risk of electrical failures.
   
4. Check the Cooling System
   To prevent engine overheating, regularly check the coolant level and clean the radiator and fan. Especially in hot weather, the cooling system plays a crucial role in ensuring the excavator’s proper functioning.
   
5. Inspect Undercarriage and Tracks
   Periodically inspect the undercarriage, tracks, and related components such as idlers and rollers. Look for signs of excessive wear or damage. Clean the undercarriage frequently, and lubricate moving parts to avoid premature wear.
   

Nissan excavators, though not as well-known globally as some other brands, have built a solid reputation, particularly in certain regions. Known for their reliability and efficient performance, these excavators are commonly used in construction and mining operations. However, like any machinery, they can encounter certain issues during their lifespan, particularly if they are not maintained properly.
Common Problems with Nissan Excavators

1. Engine Starting Issues
   A common issue faced by operators is difficulty starting the engine, especially in colder climates. This can be attributed to several factors, including poor fuel quality, clogged fuel filters, or issues with the battery or starter motor.
   
2. Hydraulic System Failures
   The hydraulic system, which powers most of the functions of the excavator, can sometimes fail due to leaks, worn-out seals, or a loss of hydraulic fluid. This can cause a significant decrease in the performance of the machine, especially in tasks requiring high lifting power.
   
3. Electrical Problems
   Electrical issues are also prevalent, with operators experiencing problems such as faulty sensors, malfunctioning gauges, or the machine failing to respond to controls. These issues are often linked to wiring problems or issues with the control panels.
   
4. Undercarriage Wear
   Like many construction machines, Nissan excavators can suffer from undercarriage wear due to constant movement over rough terrain. Tracks, rollers, and sprockets need to be regularly inspected and maintained to avoid costly repairs.
   
5. Overheating
   Overheating is another issue that can arise, especially in machines that have been working in high-temperature environments for extended periods. This can be caused by coolant leaks, clogged radiators, or malfunctioning cooling fans.
   

1. Regular Oil and Filter Changes
   Regular oil changes and replacing the engine filters is essential for keeping the engine running smoothly. Ensuring that the hydraulic oil and filter are also checked and replaced at regular intervals will prevent many common hydraulic system failures.
   
2. Monitor Fluid Levels
   Always check the hydraulic fluid, engine oil, and coolant levels before use. Low fluid levels can lead to overheating or damage to vital engine and hydraulic components.
   
3. Inspect the Tracks
   The undercarriage should be checked regularly for wear, and any components showing signs of wear or damage should be replaced. Keeping the tracks properly tensioned will extend their lifespan.
   
4. Electrical System Checks
   Periodic checks on the battery, wiring, and sensors are important to avoid electrical issues. It's recommended to keep the machine clean and free from dust and dirt, which can interfere with electrical connections.
   
5. Address Small Problems Early
   A small issue with the excavator can quickly escalate into a more significant problem if not addressed promptly. Ensure that any unusual sounds or poor performance are investigated immediately to prevent costly repairs later on.
   

The Nissan N-45 excavator is known for its reliable performance, but like all heavy machinery, it requires maintenance and occasional repairs to ensure it runs smoothly. One of the most common repair tasks involves the cylinder, which is crucial for the excavator’s hydraulic system. Replacing or repairing the cylinder seals is a necessary maintenance step to avoid leaks and improve efficiency. Here’s a detailed look into the cylinder repair kit for the Nissan N-45 excavator.
Cylinder Seal Kit for Nissan N-45 Excavator
The cylinder repair kit for the Nissan N-45 excavator includes a set of essential components designed to restore the hydraulic cylinders to optimal performance. This kit typically contains:

• Seals: The kit includes various seals such as o-rings, backup rings, and wipers. These seals are necessary for ensuring that the hydraulic fluid remains within the cylinder and that there are no leaks that could lead to a drop in pressure or inefficient operation.
  
• Piston Rings: These rings ensure that the piston inside the cylinder maintains a proper seal and allows for smooth movement within the bore.
  
• Gaskets: Gaskets prevent hydraulic fluid from leaking at the points where parts meet, providing a secure and efficient seal for the system.
  
• Wiper Seals: These seals are crucial for keeping dirt and debris from entering the cylinder and damaging the internal components.
  

Dazhou, located in Sichuan Province, is surrounded by mountains and has a population of less than 7 million. Despite its relatively small size, Dazhou is a hub for natural resource extraction, being home to the largest sulfur production base in Asia, as well as China’s biggest marine gas field and natural gas chemical park. Due to the rich mineral resources, many companies have flocked to Dazhou, and the need for urban infrastructure projects, such as housing, road construction, and land leveling, has been rapidly increasing. This, in turn, has led to a growing demand for large machinery.
Zhao Xuechun: A Veteran Excavator Operator
Zhao Xuechun, a native of Dazhou, is a seasoned professional with over 10 years of experience in the construction machinery industry. In 2001, he entered the business by purchasing a few second-hand mini excavators and offering rental services. By 2004, he was introduced to Doosan machinery, and he has since been a loyal customer, praising the efficiency, ease of operation, fuel savings, and affordable parts of Doosan products. He also appreciates their active after-sales service.
Over the years, Zhao’s business expanded, and his equipment transitioned from smaller machines to larger ones. His business now includes not only equipment rental but also independent contracting services. Zhao provides his operators with in-depth training to ensure the machines are used efficiently and with minimal downtime. His business has undertaken major projects such as the construction of the Dazhou hockey stadium, the land preparation for the Dazhou Mine Bureau office building, and the cleanup of land for PetroChina and Sinopec factories.
Why Zhao Chose the Doosan DX500LC Excavator
As Dazhou continues to develop, the demand for large-scale machinery to flatten mountains and excavate land has increased. With this in mind, when Doosan launched the DX500LC excavator, Zhao immediately decided to purchase one. This new addition was essential for his latest project, which involves land clearing for a factory site, requiring the removal of a hillside. The region's complex geology—composed mainly of limestone, dolomite, metamorphic rocks, and sandstone—calls for an excavator with high digging power and rock-breaking capabilities.
The Doosan DX500LC has exceeded Zhao’s expectations, successfully handling the mountainous terrain and tough rock excavation tasks. The excavator’s improved hydraulic system allows the machine to perform more coordinated and flexible movements, which is essential for large-scale earthworks. Additionally, the machine has been equipped with a soil breaker for optimal performance on Zhao’s project. Since its purchase, the DX500LC has been in use for over three months, significantly boosting the progress of the project.
SANY DX500LC Excavator Features & Performance
The DX500LC is an upgraded version of the DH500LC-7, designed to meet the demands of extreme mining environments in China. It combines the durability of the DH500LC-7 series with enhancements that make it more suitable for the diverse and challenging terrain of the Sichuan Basin. With its strong power, high productivity, and improved walking stability, the DX500LC is built to handle tough and fluctuating terrain conditions. It also performs well in wet conditions, minimizing the risk of landslides and other weather-related disruptions during operations.
Some key features of the Doosan DX500LC include:

• Hydraulic System: The advanced system ensures smooth operation, with better control over arm movements and optimized fuel efficiency.
  
• Fuel Efficiency: The DX500LC is more fuel-efficient than the DH500LC-7, making it suitable for areas with varying fuel quality. The machine operates effectively on domestic diesel that complies with China’s third-tier emission standards.
  
• Stability and Durability: The undercarriage has been improved for better walking stability and durability, allowing the machine to endure the rough terrain of mountainous areas and the constant rains of Sichuan.
  

As an editor in the construction machinery industry, I haven’t had extensive experience with concrete pump trucks. Most of the time, I would only see them from a distance, observing their graceful arcs on construction sites. However, I had the opportunity to learn more about the SANY SY5418THB 56E pump truck through an insightful discussion with driver Tian Liang. His expertise and passion for the equipment helped me understand pump trucks in a whole new way.
Tian Liang and the SANY SY5418THB 56E Concrete Pump Truck
Tian Liang, a 38-year-old native of Beijing, has been working with construction machinery for many years. He started as a driver for mobile cranes and later switched to concrete pumps. Currently, Tian is the dedicated driver for the SANY SY5418THB 56E concrete pump truck at Beijing Tianzhu Concrete Co., Ltd. He has been using this machine for over a year, with the pump time reaching 1,274 hours, a total pump volume of 73,483 cubic meters, and 740,132 pumping cycles.
Key Specifications of the SANY SY5418THB 56E Concrete Pump Truck

• Operational Parameters
  • Pumping Capacity: 170 m³/h
    
  • Maximum Pumping Height: 56 meters
    
  • Vehicle Weight: 41,460 kg
    
  • Maximum Speed: 80 km/h
    
  • Hydraulic System Pressure: 32 MPa
    
  • Theoretical Pumping Pressure: High Pressure 12 MPa, Low Pressure 8.3 MPa
    
• Boom System
  • Vertical Reach: 56 meters
    
  • Horizontal Reach: 51 meters
    
  • First Boom: Length 11,400 mm, Angle 90°
    
  • Second Boom: Length 9,230 mm, Angle 180°
    
  • Third Boom: Length 8,750 mm, Angle 180°
    
• Chassis
  • Chassis Model: Isuzu CYZ51Y
    
  • Axles: 4
    
  • Engine Model: 6WF1D
    
  • Engine Power: 287 kW
    
  • Maximum Speed: 80 km/h
    

• Efficient Performance: Tian mentions that the truck, when operating at full capacity, pumps 12 cubic meters of concrete every 7-8 minutes. The fuel consumption is relatively low, using only 0.7 liters of fuel per cubic meter of concrete.
  
• Comfortable Operation: The pump truck’s cabin is spacious, clean, and well-organized. Tian appreciates the seat's comfort, which is especially important for long shifts. The seat’s vibration-damping design makes it easier on his back and joints.
  
• Maintenance and After-Sales Service: Although the maintenance cost of a SANY pump truck is relatively high, Tian sees this as an investment in the machine's long-term performance. The after-sales service is highly responsive, and the staff are quick to resolve any issues, sometimes even working overnight to meet urgent needs.
  

1. Piston Head Design: Tian recommends changing the piston head from a straight mouth to a bell-mouth design to improve efficiency.
   
2. Boom and Distribution Valve Adjustment: He feels that the boom system and the electronic distribution valve need to be more precise. Inexperienced drivers might struggle with the initial setup. More detailed training should be provided to help new drivers get accustomed to the truck faster.
   
3. Transmission Noise: The noise from the transmission box is quite loud, which can be distracting during pumping operations. A reduction in noise would improve comfort.
   
4. Grease Injection System: The automatic grease injection system could use some improvement, especially in the delivery cylinders, which require more lubrication.
   
5. Remote Control Weight: Tian finds the remote control for the pump truck to be too heavy. After a few hours of use, the weight becomes a strain on the shoulder, making it uncomfortable.
   
6. Reduction Gearbox: Tian suggests using a double reduction gearbox for better control, especially for less experienced operators, as the current single reduction gearbox can be damaged easily.
   

When the name "Komatsu" is mentioned, many might think of it as a renowned brand in the construction machinery industry. In the world of construction equipment, Komatsu holds a significant position, comparable to a leading figure in a group, if not the top boss. Today, we explore the real-world experience of a seasoned operator with the Komatsu PC160LC-7, a popular model in Komatsu’s lineup.
Introduction and User Profile

• Excavator Model: Komatsu PC160LC-7
  
• Operating Hours: 500 hours
  
• Operator: Li Mingwei (pseudonym), 28 years old with 6 years of excavator experience
  
• Previous Machines: Hitachi large excavators; Komatsu small and medium-sized machines
  

• Fast Working Speed
  The most notable feature of the Komatsu PC160LC-7 for Li Mingwei is its fast working speed and high efficiency. Whether it's earthwork, stone handling, or demolition tasks, the machine handles them all with ease. Li Mingwei appreciates the machine's performance, especially in comparison to other models. The Komatsu CLSS hydraulic system makes operation smooth and responsive, and features like idle alert and automatic deceleration help optimize fuel consumption during routine operations.
  
• Fuel Consumption
  When it comes to fuel efficiency, Komatsu excavators are often praised for being fuel-efficient. Li Mingwei explains that fuel consumption depends on the work type and the quality of the fuel. For earthmoving tasks, the PC160LC-7 consumes about 120-130 liters of fuel for an 8-hour shift. For demolition work that involves heavy attachments like hydraulic shears and breakers, the fuel consumption increases to 140-150 liters per shift.
  
• Hydraulic and Engine Efficiency
  The Komatsu PC160LC-7 is equipped with the SAA4D102E-2 engine, delivering 82.4 kW (112 PS) at 2200 rpm/min, with a high fuel efficiency. The engine meets the EPA (Environmental Protection Agency) EU and Japan’s Stage II emissions standards, ensuring that the excavator is environmentally friendly. Furthermore, the machine offers four working modes to optimize performance and fuel consumption:
  
  1. A Mode (Fast Mode)
     
  2. E Mode (Economy Mode)
     
  3. B Mode (Breaker Mode)
     
  4. L Mode (Fine Operation Mode)
     
  In E Mode, the machine automatically adjusts engine speed, controlling fuel consumption and ensuring efficient operation. A feature worth noting is the idle alarm: if the engine idles for more than 5 minutes, the system prompts the operator to turn off the engine to avoid unnecessary fuel consumption. The automatic deceleration feature reduces engine speed when the control lever is in the neutral position, minimizing fuel waste.
  

• Build Quality and Stability
  Li Mingwei considers the overall build of the Komatsu PC160LC-7 to be sturdy. The machine's cabin is reinforced, offering protection in case of a rollover. For additional stability, especially during demolition tasks, the tracks on this machine have been widened, preventing the excavator from getting stuck on rooftops or other unstable surfaces.
  
• Cabin Comfort
  The cabin of the PC160LC-7 is significantly more spacious than the previous PC150-5, with a 30% increase in size. The operator refers to the cabin as “luxury class,” likening it to a business-class seat in an airplane. The cabin is fully sealed, providing excellent sound insulation, similar to that of a passenger car.
  
• Seat Comfort
  The seat features advanced vibration damping, making it highly comfortable for long hours of operation. The seat uses a high-damping spring and long-stroke design, which helps alleviate pressure on the operator's spine, reducing the risk of back problems. The seat also reclines, allowing the operator to rest during breaks.
  
• Air Conditioning and Controls
  Li Mingwei is satisfied with the air conditioning system, noting that it cools quickly and efficiently, with multiple adjustable air vents. The cabin also features a hydraulic lock lever with a smooth and user-friendly design. He also appreciates the machine’s sound system, which provides high-quality audio, making the workday more enjoyable.
  
• Maintenance and Accessibility
  The maintenance design of the Komatsu PC160LC-7 is also well thought out. The machine’s radiator, intercooler, and oil cooler are arranged in parallel for easy access. Daily maintenance tasks, such as cleaning and removing filters, are simple and do not require special tools. The machine also comes with a large tool compartment, allowing the operator to store essential tools, including the grease gun.
  

The Komatsu 220-8 excavator, a flagship model in Komatsu's product line, is well-known for its reliability and performance. Today, we'll hear from a seasoned user who shares their real-world experience with this machine, providing valuable insights into its strengths and weaknesses.
Purchase Background and Initial Use
In 2009, the user’s company took on a slope treatment project in Gansu. To meet the project’s needs, in addition to an existing Komatsu 240 excavator, they decided to purchase a Komatsu 220-8 directly from Xi’an. The machine weighs 23 tons and comes with a 1.3m³ bucket. Now, with 6278 operating hours on the clock, the machine still runs well, showing no signs of oil leakage. It’s worth mentioning that, in the first 5500 hours of operation, the machine was used exclusively for light tasks, with no stone work, thanks to a highly skilled operator who was meticulous with maintenance and care.
Advantages: High Efficiency and Adaptability

• Bucket and Work Efficiency
  Despite being labeled as the 220 model, the machine was fitted with a 1.3m³ bucket, 0.3m³ larger than the standard. The larger bucket did not affect its speed at all. In fact, the user found that the 220-8 was consistently faster than the Komatsu 240 with the same-sized bucket, making it highly efficient for loading tasks.
  
• Excellent Environmental Adaptability
  One notable example of the 220-8's adaptability came during the winter when the site was unable to source #10 diesel and had to use #0 diesel instead. While five excavators were in operation—two Komatsu machines and three domestic brands—the 220-8 was the only one that could consistently perform, even in cold temperatures. Despite using the same diesel, the 220-8 started up quickly and continued to operate, showcasing its excellent performance in extreme conditions.
  
• Cost-Effectiveness
  From a cost perspective, the Komatsu 220-8 is not only more affordable than the 240, but it also holds better resale value in the second-hand market. The fuel consumption is lower than the 240, yet the 220-8’s work performance is equally impressive, making it a great choice for users seeking efficiency and economy.
  

• Water Reservoir Problem
  One issue the user noted was the quick depletion of water in the machine's water reservoir. Every four to five days, it needed to be refilled with a bottle of mineral water. Despite multiple repairs, this issue persisted, making it a recurring problem.
  
• Air Conditioning and Door Seal Issues
  The air conditioning in the cab is not very effective, with low airflow and poor cooling performance. Even after recharging the refrigerant, the issue persisted. Additionally, after a rollover incident, the door seals no longer functioned properly, causing dirt to accumulate in the cab at the end of each workday. While this did not impact the machine’s ability to function, it did reduce overall comfort.
  

While tracked excavators are more common and well-known, wheeled excavators offer unique advantages, particularly when it comes to mobility. Unlike tracked models, wheeled excavators can easily relocate across different sites, saving on transportation costs and time. Among the wheeled excavator market, those in the 15-20 ton range are the most popular. Recently, we spoke to a 24-year-old operator from Liaocheng, Shandong, who has six years of driving experience and currently operates a Doosan DH150W-7. He shared his insights on this machine's performance on a construction site in Beijing.
Background: Diverse Experience
Despite his young age, the operator has extensive experience with various types of machinery. He started with a Kubota mini excavator, progressed to a 20-ton Hitachi tracked excavator, and now works with the Doosan DH150W-7 wheeled excavator. His experience with different brands and machine types gives him a well-rounded perspective on the unique characteristics of wheeled excavators.
Key Features of the Doosan DH150W-7
According to Doosan's official information, the DH150W-7 is designed for high mobility without damaging road surfaces. It combines the powerful, stable features of tracked excavators while being well-suited for navigating narrow roads. This makes it ideal for use in rugged terrain with low earth-moving requirements.
Best Hydraulic System
One of the standout features of the DH150W-7 is its flexible hydraulic system. The joystick controls are divided into two sections, allowing operators to balance oil flow according to the job at hand. This enables the boom, arm, and bucket to operate smoothly, quickly, and efficiently, offering true ease of control.
Low-Noise, High-Power Engine
The Doosan DH150W-7 is powered by a 200-horsepower engine, featuring an Air-to-Air Intercooler. It meets domestic emissions standards and is equipped with a new cooling fan and large muffler, making it fully compliant with European noise standards. This ensures that the engine is both powerful and environmentally friendly.
Comfortable Operating Environment
The DH150W-7 is designed for operator comfort with low noise, minimal vibration, a comfortable seat, and a spacious cabin. It also includes a climate control system suitable for year-round operations, a multi-function LCD dashboard, and ergonomically arranged buttons, all contributing to an excellent working environment.
Bucket Design
The bucket is equipped with hardened connection holes and wear-resistant materials on the lip and side plates, improving durability and performance.
Operator's Review
The operator shared his experiences after using the Doosan DH150W-7 for over three months, primarily on backfilling tasks on the construction site. The machine's hourly operating cost is around 1600 RMB per day.
Advantages

• Mobility: The wheeled excavator is much easier to move compared to tracked models, especially on large sites. The low fuel consumption is another key benefit, with the machine consuming approximately 500 RMB in fuel per shift.
  
• Efficiency: The DH150W-7 outperforms other brands on the site, with faster operation and more efficient movement.
  
• Reliability: The machine has not experienced any significant breakdowns during its use, which is a major advantage in ensuring continuous work on-site.
  

• Lower Efficiency Compared to Tracked Excavators: Tracked machines can move directly onto piles of dirt and start working, whereas wheeled excavators need to create a path before accessing the material. This makes the wheeled model slightly less efficient in certain situations.
  
• Tire Wear: The wheeled excavator tends to wear out tires faster, especially on rough roads. This can increase maintenance costs over time.
  
• Operator Fatigue: Compared to tracked excavators, wheeled machines require more frequent movement across the site, which can lead to operator fatigue, especially during long shifts.
  

• The bucket pin showed some wear due to a gap.
  
• There was a leakage in the high-pressure hydraulic hose, which was resolved by the owner replacing six hoses without involving after-sales support.