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.
   

This article is part of our "User Interviews" series, where we interview real users of popular excavator models to provide valuable insights for prospective buyers. All information comes from actual user experiences, as the performance of the machine is closely related to the working conditions and operator habits. Therefore, the content in the interviews may not represent all the features of the model.
The first user we interviewed is Mr. Wang, a contractor from Henan, who frequently works in Beijing. He is a friend of a member of an online engineering machinery platform, and he purchased the Yuchai YC60-8 excavator. The machine is primarily stationed in the Chaoyang District of Beijing.
Basic Information
The Yuchai YC60-8 is one of the best-selling models in Yuchai Heavy Industry's excavator lineup. It is an upgraded version of the popular YC60-7, which is widely recognized by Chinese users. The YC60-8 has applied for 12 patents and has won multiple awards, including the "Guangxi Science and Technology Progress Award" and the "Third Prize of China Machinery Industry Science and Technology Award." According to industry data, it was the top-selling excavator in its category from January to May 2010.
Key Specifications:

• Operating Weight: 5800kg
  
• Engine Model: Yuchai YC
  
• Engine Power: 45kw/2200rpm
  
• Bucket Capacity: 0.22m³
  
• Bulldozer: Standard
  
• Breaker Line: Optional
  

1. Small Cab Space: While the size of the YC60-8 is considered medium in its class, the cab feels cramped. The limited space makes it less comfortable for the operator, especially during long hours of operation.
   
2. Poor Sealing: The excavator’s poor sealing leads to dust and noise inside the cab, which is a common problem for operators working in such environments. Xiao Li frequently finds himself covered in dust after a day’s work, and he hopes that Yuchai could improve the sealing in future models to enhance comfort and working efficiency.
   
3. Ineffective Air Conditioning: Since the machine was purchased, the air conditioning system has never worked properly. The cooling effect is minimal, and because of the poor sealing, the little cold air that does come out quickly escapes. Xiao Li had to resort to using a fan instead of the air conditioning.
   

When looking to purchase a mini excavator, there are several important factors to consider. A mini excavator can be a great investment for a variety of tasks, including landscaping, construction, and small demolition projects. However, choosing the right model for your needs requires careful evaluation of several aspects.
1. Understanding Your Project Needs
Before purchasing a mini excavator, you should first assess the types of tasks you'll be performing. Mini excavators are versatile, but their capabilities vary based on size, weight, and attachments. If you're working in tight spaces or need to maneuver around obstacles, a smaller model might be more suitable. Conversely, for larger or more demanding jobs, a larger mini excavator could be a better option.
Consider the following:

• Worksite Conditions: Will you be working on rough terrain or smooth surfaces? If the ground is uneven, a tracked mini excavator might be more appropriate due to better stability and traction.
  
• Lift and Digging Requirements: Evaluate the depth of digging required and the weight capacity needed for lifting. Choose a model with adequate hydraulic power and digging reach for your tasks.
  

• Easier to transport, especially if you have limited space or need to move the equipment frequently.
  
• Better for jobs requiring precision or working in tight spaces.
  
• Generally, they are lighter and can be used in locations where heavier machinery might cause damage.
  

• Greater lifting and digging capacities.
  
• More powerful engines and hydraulics.
  
• Can handle tougher tasks and larger attachments, like breakers or augers, more efficiently.
  

• Bucket Size and Shape: Ensure the excavator comes with or can accommodate a variety of bucket sizes to handle different materials.
  
• Hydraulic Options: Some mini excavators offer auxiliary hydraulics, which allows you to connect and power a wide range of attachments.
  
• Other Tools: You might also need tools like breakers, compactors, or grapples depending on your tasks. Make sure the excavator you’re considering can handle these tools.
  

• Flow and Pressure Ratings: Make sure the excavator's hydraulics are powerful enough for the types of tasks you will be doing.
  
• Hydraulic System Features: Some models feature adjustable flow controls or high-flow hydraulics for added versatility in attaching different tools.
  

• Control Layout: Look for a layout that feels intuitive and comfortable to you.
  
• Operator’s Seat: Check for comfort and adjustability, as this can impact your performance over long hours.
  
• Visibility: Make sure you have good visibility from the operator’s seat, especially when working in tight areas.
  

• Kubota: Known for their reliability and strong customer support.
  
• Bobcat: Offers a wide range of models and attachments, with a reputation for power and versatility.
  
• Caterpillar: Well-known for their robust, long-lasting equipment suitable for larger jobs.
  
• Takeuchi: Offers durable mini excavators with excellent hydraulics and innovative designs.
  

• New Equipment: Comes with the latest technology, warranties, and is in pristine condition.
  
• Used Equipment: Can save money but may require more maintenance or repairs. Always check the machine’s history, usage, and condition before purchasing.
  

This report shares my experience with various models of excavators, including Komatsu PC200-3, Komatsu PC220-6, PC220-7, PC240LC-8, and Doosan DH220LC-V. The report highlights the advantages and disadvantages of these machines and compares their performance in different scenarios.
First Machine: Komatsu PC200-3
14 years ago, I purchased my first Komatsu excavator, the PC200-3, as a second-hand machine for 450,000 RMB. It had around 3000 hours of usage. Although I later discovered that it had been refurbished, the machine performed flawlessly. However, an issue arose when the fan belt was damaged, causing the engine to overheat. After replacing the belt, the machine worked fine for another week before the engine completely failed. Due to limited repair knowledge and high repair costs, the engine was deemed a total loss. The manufacturer quoted a price of 380,000 RMB for a new engine, but I found a more affordable solution by replacing it with a Yuchai engine for just 30,000 RMB, including installation. After the replacement, the machine ran smoothly, and it was hard to tell that the engine had been replaced!
Evaluation:

• Pros: The PC200-3 impressed me with its durability and high-quality Japanese engineering.
  
• Cons: Although the engine replacement solved the problem, the high maintenance costs raised concerns.
  

• Pros: Reliable and cost-effective, with low maintenance requirements.
  
• Cons: Slightly slower speed, but still performs well overall.
  

• Pros: Reliable hydraulic system, suitable for long hours of work.
  
• Cons: Undercarriage wear and arm cracks after extended use.
  

• Pros: Powerful engine and versatile performance, suitable for heavy-duty tasks.
  
• Cons: High fuel consumption, especially in P-mode. The hydraulic cylinders tend to discolor, affecting the machine's appearance, although it doesn't impact functionality. Additionally, the cooling system is complex and expensive to repair if damaged.
  

• Pros: Excellent performance and power, with great versatility for various tasks.
  
• Cons: High fuel consumption, particularly in demanding conditions. Hydraulic cylinders are prone to discoloration, and high-pressure hoses need frequent replacement.
  

I purchased the Longgong 855B Rock King wheel loader at the end of November 2009. After more than six months of use, and with just over 1000 hours of operation, I would like to share my insights on the machine’s pros and cons based on my experience.
Advantages

1. Durability and Build Quality:
   The 855B is part of the Rock King series, which gives the loader a solid, durable feel. The overall design ensures it can handle tough work conditions with ease.
   
2. Stability During Operations:
   When performing tasks such as earth loading, the machine seldom experiences “tail tipping”. The rear counterweight is well-balanced, helping maintain stability during heavy-duty operations.
   
3. Excellent Visibility:
   The driving cab features a panoramic glass design, providing outstanding visibility. This feature significantly enhances the operator’s ability to navigate and monitor surroundings, increasing safety and comfort.
   

1. Poor Interior Design and Sealing:
   The cabin interior quality is below par, with poor sealing. After only a few hours of operation, screws on the dashboard became loose and couldn’t be tightened. Additionally, the doors do not seal properly, causing them to rattle when closed.
   
2. Inefficient Bucket Design:
   The bucket's cutting edge protector is poorly designed. The teeth extend only about 10 cm beyond the protector, making it harder to cut into soil piles effectively. After a few hours of use, I removed the protector and plan to weld a new one once I have accumulated some operating hours.
   
3. Heavy Control Levers:
   I’ve tested several Longgong loaders, and the control levers tend to be heavy, which is a common issue across their range. This can make operation tiring during long hours of use.
   
4. Difficult Maintenance:
   The engine hood’s side doors open upwards, making routine maintenance and repairs somewhat inconvenient. It’s not the most practical design for easy access.
   

I have used three Longgong LG850 wheel loaders over the years, bought in 2007, 2008, and 2009. Below is a summary of my experience with these machines, covering their performance, issues, and maintenance.
General Overview

• Machine 1 (purchased in 2007): Currently has over 7000 hours of operation.
  
• Machine 2 (purchased in 2008): Has 4000 hours of use.
  
• Machine 3 (purchased in 2009): Has just over 1000 hours.
  

• Machines 1 and 2 use the WD615 engine.
  
• Machine 3 is fitted with the WD10, which complies with Euro III emissions standards. The WD10 has smaller bore and stroke dimensions, but maintains the same output of 162 kW, resulting in lower fuel consumption.
  
• Machine 1 has experienced several issues, including oil leaks around the cylinder head and corrosion at the water seals. The turbocharger is positioned very close to the cylinder head, making repairs difficult. I had to replace several water seals and the fuel injection pump, which was a cumbersome process. During cold starts, the machine requires extra throttle to avoid stalling, and it emits white smoke before stabilizing.
  
• Machine 2 has faced issues with water seal leaks and an electronic valve failure, which was converted to a manual valve. The starter motor also needed replacement at one point.
  
• Machine 3 had problems with its electronic valve and had to replace a turbocharger gasket.
  

• Machine 1's dual transmission system is still functioning well.
  
• Machine 2 required repairs after about 3000 hours of operation due to damage to the torque converter bearings. The bearings used were from ZWZ.
  
• Machine 3 felt slower to respond after shifting, especially when starting from a standstill.
  

• Machine 1 has required numerous repairs to its front axle. The latest repair may have left the axle casing bolts inadequately tightened, leading to a minor oil leak. The half-axle was once broken, and the brake system has had recurring oil leaks. The power booster pump has been replaced. The tires from Henan Fengshen lasted long but are now worn down, and I replaced them with refurbished tires.
  
• Machine 2 experienced repeated issues with the planetary gears in the front axle. The gears broke multiple times within days, necessitating removal of the tires for repair.
  
• Machine 3 has not had issues with the axles up to now.
  

• Machine 1 and 2 use Jinan Hydraulic Factory pumps, while Machine 3 uses Longgong’s own hydraulic pumps. The latter has been functioning well so far.
  
• Machine 1 had all four hydraulic cylinders wear out, and I had to replace them. The first replacement cylinders also wore out quickly. Machine 2 had the boom hydraulic seals replaced.
  
• Machine 1's hydraulic return line disconnected twice, draining all the hydraulic oil, which was a painful experience. Also, the steering system and valve block started leaking oil shortly after they were replaced.
  

• Machine 1 has an ongoing issue with the swing bucket’s top pin breaking frequently.
  
• The paint quality on the Longgong machines is quite good, and after cleaning, the old machines look nearly as good as new.