This article shares the experiences of a user who has worked with various excavators over the past 14 years, including models from Komatsu, Doosan, Daewoo, and others. The user provides insights into the strengths and weaknesses of different machines, based on real-world usage.
Komatsu PC200-3 Excavator
Purchase and Usage

• Purchase Time: Approximately 14 years ago, second-hand, purchased for 450,000 RMB with 3,000 operating hours.
  
• Issues Found: Initially, the machine appeared to be original, but over time, the user discovered that it had been refurbished. After five years, the fan belt was not replaced, which led to the belt breaking and causing the engine to overheat. After replacing the belt, the engine failed completely within a week.
  
• Solution: The user sought help from an expert who recommended replacing the engine with a customized Yuchai engine. The cost for the new engine and installation was only around 30,000 RMB, a significant saving compared to the 380,000 RMB quoted by the manufacturer for a new engine. After replacement, the machine ran like new.
  

• Reason for Purchase: After the engine replacement in the Komatsu PC200-3, the user was dissatisfied with the brand and decided to purchase a new machine. They initially considered buying a new Komatsu PC220, but due to the high price, they shifted focus to other brands. Daewoo offered a good value alternative, with the DH220LC-V priced at 670,000 RMB.
  
• Experience: The Daewoo DH220LC-V is currently at 16,000 hours of use, with a 10-year lifespan. The machine has not undergone major repairs, and 90% of the original paint remains intact. The user plans to replace the chain at 20,000 hours, as it is significantly worn. Despite the decrease in speed, the machine still operates well at 2,000 RPM under load.
  

• PC220-6: This model has been very reliable when well-maintained. At 15,000 hours, the machine’s hydraulic pump remained in excellent condition. However, there was an issue with the track system when used in a stone quarry, as the idler wheels needed replacing after 12,000 hours.
  
• PC220-7: This model has inherited most of the features of the PC220-6 but with a few minor issues. The main issue is the tendency for the boom and arm to crack, although this is not a serious problem.
  

• Power: The Komatsu PC240LC-8 features an electronically controlled engine, providing excellent power output. Among the 240-class excavators from various brands, the Komatsu model stands out for its power.
  
• Fuel Consumption: One downside is its high fuel consumption. Using the P mode with 100% throttle, fuel consumption can reach as high as 28.6 liters per hour, especially when working with difficult materials. To improve fuel efficiency, the E0-E3 modes can be used, with E0 being the closest to P mode and E3 being the slowest but most fuel-efficient.
  

• Fuel Consumption: Komatsu excavators, especially the PC-6, -7, and -8 series, tend to have higher fuel consumption compared to competitors. While the -8 series is equipped with an electronically controlled engine, it still consumes more fuel than earlier models.
  
• Hydraulic Cylinders: There is a tendency for hydraulic cylinders to burn out or get discolored over time, particularly in the -8 series. While this does not affect the machine's performance, it does impact the machine's appearance.
  
• High-Pressure Hose Issues: It is common for high-pressure hoses to fail after around 5,000 hours of use, requiring replacement.
  

• Komatsu PC240LC-8: This model offers great power and stability, but its high fuel consumption is a significant drawback. It remains an excellent all-around excavator for various tasks, but users should be mindful of the operating costs.
  
• Daewoo DH220LC-V: A reliable and cost-effective option, this excavator has performed well over 16,000 hours without major issues. The user recommends it as a strong contender for long-term use, especially when compared to more expensive models.
  
• Komatsu’s Overall Quality: While Komatsu excavators maintain a high level of performance and durability, users should be aware of the increased fuel consumption and hydraulic issues in certain models. Despite these drawbacks, Komatsu continues to be a leading brand in the excavator market.
  

I purchased the Longgong 855B loader in late November 2009, and after more than six months of use, I’ve accumulated just over 1000 operating hours. Below is a summary of my experience with this machine, including both its advantages and disadvantages.
Advantages

1. Sturdy and Durable Build
   As part of the Rock King series, this loader has a solid, heavy feel that instills confidence in its durability. It's designed to handle tough work environments effectively.
   
2. Minimal Rear Lifting During Digging
   The machine rarely exhibits rear lifting when scooping material, thanks to a well-designed counterweight in the rear that helps maintain balance during operations.
   
3. Excellent Visibility
   The loader is equipped with a panoramic glass cabin, which offers excellent visibility. This feature significantly improves the operator's awareness of their surroundings, contributing to better safety and control during work.
   

1. Poor Interior Quality and Sealing
   The interior finishes of the cabin are subpar, and the sealing performance is inadequate. After only a few dozen operating hours, screws on the dashboard loosened and could not be tightened again. Additionally, both doors do not close tightly, and there is a rattling sound when they are shut.
   
2. Poorly Designed Bucket Guard Plate
   The guard plate on the bucket is poorly designed. The cutting edge of the bucket is exposed by only about 10 centimeters, which affects the digging feel. After a few hours of use, I removed the guard plate and plan to weld a new one later.
   
3. Heavy Control Levers
   The control levers are a bit stiff, which can be tiring for the operator over long shifts. I’ve tested several Longgong loaders, and this seems to be a common issue across their models.
   
4. Difficult Engine Compartment Access
   The rear hood of the engine opens upward, making it inconvenient for routine maintenance and servicing. This design could have been more user-friendly.
   

I have used three Longgong LG850 loaders, with the following purchase timeline: the first in early 2007, the second in mid-2008, and the third in late 2009. All three machines weigh 15.8 tons, and while they all exhibit some common traits, such as occasional rear-end lifting when in use, the following report outlines my experience with this particular model, based on my usage of these three units.
1. Engine
The engines of the Longgong LG850 loaders are all from the Weichai series. The first two units use the WD615 engine, while the third one is equipped with the WD10 engine, meeting the Euro III emission standards. From the specifications, we can see that the WD10 engine has a smaller bore and stroke, but the power remains the same (162kw), and the fuel consumption per kilowatt hour is lower.

• The WD10 engine features an oil-water separator filter, and the fuel filter has been integrated into a complete assembly.
  
• The first vehicle uses a cable-operated shutdown switch, while the second and third units use an electromagnetic valve shutdown system, which unfortunately has a shorter lifespan.
  

• The first vehicle's double gearbox remains in good condition.
  
• The second vehicle needed a gearbox repair after 3,000 hours, primarily due to bearing failure in the torque converter. The bearings used in the system were from ZWZ.
  
• The third vehicle felt slightly slower to respond when shifting gears after the vehicle was new.
  

• The first vehicle has required repairs to the front axle numerous times. After the most recent repair, it was suspected that the axle housing bolts were not tightened correctly, causing oil leaks. The half-axle also broke once, and the braking system often leaks oil. The hydraulic pump was replaced, and the original Henan Fengshen tires, which were heavily worn, were replaced with remanufactured tires.
  
• The second vehicle had an issue with the planetary gears in the front axle, which repeatedly failed within a short period. The gears were damaged and got stuck inside, requiring the tires to be removed for repairs.
  

• The first vehicle has had an ongoing issue with the upper pin of the bucket constantly breaking.
  
• Despite these mechanical challenges, Longgong’s paintwork is notable. The older machines maintain a new appearance even after being washed.
  

I’ve been using the Doosan DH55 for about half a month now, and it has accumulated around 150 hours of work. Here’s a summary of my impressions and comparisons with the Komatsu PC55:
Engine Performance
The engine in the Doosan DH55 is noticeably louder than that of the Komatsu PC55. Even when I push the throttle to the maximum on the older Komatsu PC55 (which has been in use for 4 years), it doesn’t generate as much noise as the DH55.
Fuel Consumption
I find the fuel consumption of the Doosan DH55 to be higher compared to the Komatsu PC55.
Hydraulic System
Since the DH55 is still new, I haven’t had the chance to mount a hammer on it yet, so I can’t make a definitive judgment. However, during operation, when lifting the boom, it generates a relatively loud noise. In comparison, the Komatsu PC55 with a hammer installed operates without any unusual noise.
Fuel Tank Capacity
Both excavators have a fuel tank capacity of 64 liters, but the Doosan DH55 struggles to fill up even with 500 RMB worth of fuel, while the Komatsu PC55 reaches almost full with just 400 RMB worth of fuel.
Cabin and Build Quality
The Doosan DH55’s cabin has rougher build quality. On the first day of use, I scratched my hand on the sunroof, and later during work, I noticed more scratches on the interior. The overall craftsmanship feels unfinished.
On the other hand, the Komatsu PC55 has a more refined finish. However, the build quality of the door locks is questionable. In our area, there were once 12 Komatsu PC55 excavators, but now only four remain. One has the door removed, another has a self-made internal latch, and mine still has a working door lock, although I have to close it from the inside and climb out of the front window to lock it. I’ve had to repair the lock more than 20 times, but I’ve just been living with it. I’ll wait and see how the Doosan DH55 performs in this regard.
Undercarriage and Tracks
Komatsu's undercarriage has been troublesome. Between 3000 and 5000 hours, the tracks would frequently come off, often twice a day. After replacing the guide wheels and four support rollers, the problem was resolved.
The Doosan DH55, however, looks sturdier. The track plates are thicker, and it has protective guards. I expect fewer issues with the undercarriage in the future.
Bucket Durability
At 6000 hours, I had to replace the bucket on the Komatsu PC55 due to intermittent tearing at the front. In comparison, the Doosan DH55’s bucket feels very thin. After just 50 hours of use, I accidentally touched a steel rail, and the bucket hit a pit.
Speed
The Doosan DH55 is noticeably slower, especially in rotation speed. Everything else also feels slower compared to the Komatsu PC55. Even though my Komatsu is now a bit slower than before, I still feel it’s faster than the DH55. (After checking with after-sales, I found that the hydraulic system is working fine, but the flow rate is slightly lower. Any experts out there who can advise how to increase the flow rate without replacing the main pump?)
Lighting
The lighting design on the Doosan DH55 isn’t ideal. The headlights are located below the cabin, and after working a few nights, I found it a bit uncomfortable. I personally prefer the lighting setup on the Komatsu.
Power
In terms of power, I feel the Doosan DH55 is stronger, as it doesn’t tend to lift its tail as much. However, my father thinks the Komatsu PC55 has more power.
Size and Tail Swing
No surprises here—the Komatsu PC55 is better in this category, thanks to its zero-tail swing design. The Doosan DH55, however, is a bit larger, and during the first 100 hours of use, the tail got scraped. When we were short on drivers, I let a driver try it, but after that incident, I decided to operate it myself.
After-Sales Service
One of the standout aspects of Doosan is its after-sales service. It’s been excellent compared to Komatsu. Doosan provides attentive support and calls back after each inquiry. The staff is more customer-oriented and doesn’t have the attitude that some of Komatsu's after-sales personnel have. This level of service is much appreciated.

After the year 2000, a new piece of equipment started turning heads on the roads of Shenyang — the Case 580L backhoe loader (commonly referred to as a “two-in-one” machine). When people first saw it, the rate of turning heads was almost 100%. This caught the attention of the leadership at the Shenyang Water Supply Company (the predecessor of Shenyang Water Group). A year later, they made the decision to purchase one. By November 2001, the Case 580L was delivered. At that time, there were only three Case 580Ls in Shenyang—one owned by our company and two by the Shenyang Gas Company.
The arrival of the Case 580L marked the beginning of a new era for us. First, its speed of 40 kilometers per hour allowed us to quickly transfer between repair sites, significantly shortening the travel time. Secondly, the machine’s excavating and loading control levers are fewer than most other machines, making it easy to operate and further reducing the time needed for repairs. Lastly, the low failure rate meant that the Case 580L was able to maintain reliable performance, day after day.
Initially, some people doubted the decision to purchase the machine for 580,000 yuan, but over time, the Case 580L proved its worth. The performance of the equipment won over the team, and everyone gave a thumbs up to the decision.
Maintenance and Issues
Over the nine years of working with the Case 580L, many stories have unfolded. One of the first issues I encountered was related to the gearbox oil. At first, we didn’t realize that a special torque fluid was required for the gearbox, rather than regular transmission oil. This led to the machine’s performance degrading after two years, especially in summer when its movement became sluggish. After sending it to the repair center, we found out that the gearbox had become clogged with the wrong oil, and we had to spend more than 30,000 yuan to repair it. Apart from this major repair, most of the maintenance involved replacing wear-and-tear parts, such as the central control switch for the tracks, which wore down due to prolonged use, and the gear shift lever, which broke after frequent shifting. The engine, however, continued to perform admirably without any major repairs. Overall, the Cummins 4BT3.9 engine has shown excellent durability.
Annually, we also had to replace the excavator’s bucket teeth as part of regular maintenance.
Handling and Driving Experience
The handling of the Case 580L is very smooth and user-friendly. It comes equipped with a three-spoke steering wheel. Thanks to its fully hydraulic system, the steering is very light and precise, allowing the driver to turn the wheel with just two full rotations. The loader’s control lever is single, which makes operation comfortable and quick, while the excavator’s controls are dual, allowing for efficient and quick combination movements. The gearshift lever is conveniently placed on the right side, and shifting is smooth. Additionally, the handbrake and loader controls have a break-away button, which makes operation more convenient.
The seat is equipped with a shock-absorbing design, enhancing comfort during long hours of work.
Modifications and Customization
In terms of modifications, not many changes have been made to the vehicle itself, apart from upgrades to the entertainment system. The original radio was replaced with a DVD system with visual capability. The number of speakers was increased from two to four, and although I considered adding a subwoofer, the limited space in the cabin prevented me from doing so. I also added a police-style roof light.
Drawbacks
While the Case 580L performs well overall, there are several areas in the cabin design that could use improvement. First, the engine is relatively old and lacks electronic control, which puts it at a disadvantage compared to more modern competitors like JCB. Secondly, the steering wheel cannot be adjusted, unlike JCB models, which provide adjustable steering columns for better comfort. The seat cannot recline, which makes long hours of operation tiring. Additionally, the maintenance costs are relatively high because all parts must be sourced from the manufacturer, and there is no aftermarket option. This makes maintenance expensive, especially for parts like filters and lubricants.
About Case
Case Construction Equipment has a history of over 160 years, founded by J.I. Case and initially producing steam rollers and graders in the late 19th century. Over the years, Case has expanded its product line and by 1912 had become a full-line construction equipment manufacturer. The company has been known for its industry "firsts" and continues to lead in innovation in construction machinery and solutions. Today, Case offers 15 product lines and 90 models of machinery designed to meet the challenges of tough work environments. With a global presence in over 160 countries, Case provides extensive support and service to its customers worldwide.
Conclusion
Overall, the Case 580L backhoe loader has proven itself to be a reliable and versatile machine, ideal for rapid transitions between repair sites and various tasks. Although it does have some room for improvement in terms of cabin design and parts availability, it has delivered consistent, high-performance results. For teams engaged in urban infrastructure projects or emergency repairs, the Case 580L has certainly proven to be a valuable investment. We hope Case will continue to improve on details and make spare parts more accessible for the Chinese market in the future.

Backhoe loaders, also known as "two-way busy" machines, are highly valued for their versatility and quick transition capabilities. These machines find applications in urban and rural road construction, cable laying, electrical works, airport projects, municipal construction, agricultural irrigation, rural residential construction, stone extraction, and various small construction projects. In China, backhoe loaders are primarily used in municipal construction, water and gas pipeline emergency repairs, and small-scale road maintenance. Below is a user review of the JCB 3CX-2T backhoe loader, written by a municipal unit employee from Linyi, Shandong province. The opinions expressed in this report are personal and do not represent any official stance.
Machine Overview
The JCB 3CX-2T is the second backhoe loader in Shandong Province, purchased in October 2004 for 870,000 RMB through a trade-in. When the machine arrived, it had just 5 hours of operation. At the time, no one in the unit knew how to operate it, so I relied on my experience with wheel loaders and excavators, as well as trial and error, to gradually get the hang of it. Over time, 8 operators in total have trained on this machine, with most of the work being carried out by me.
Machine Specifications
The JCB 3CX-2T is equipped with a 4-cylinder, turbocharged 95-horsepower Perkins engine. It comes with vacuum tires (Goodyear for the front tires and another imported brand for the rear), and all 8 work lights are high-brightness “Hella” brand from Germany. The backhoe section has a side-shift feature (not a powered side-shift) and includes a 360-degree hydraulic breaker.
A downside to this model is that the tool kit only includes a grease gun, a pressure gauge, and a tire-changing tool, with no wrenches included. I hope the manufacturer can improve this in the future, as even a basic toolset would make a big difference in user satisfaction.
Key Features and Usage
The machine has been primarily used for large projects, with occasional smaller tasks for other units. The operation is smooth when using the loader function, but the backhoe section lacks pilot controls, making it tiring to operate for long periods. The backhoe loader’s ability to transition between tasks quickly is convenient for urban operations, especially for small jobs like road repairs. However, the operator has no time to rest while others or other machinery take breaks.
Advantages

1. Air Conditioning and Comfort
   The two-wheel drive model comes with air conditioning, which is effective with multiple air vents. The air compressor is made by Shanghai Yichu General.
   
2. Good Sound Insulation
   The cabin provides excellent sound insulation. Even while using the breaker, the noise inside the cabin is not overwhelming.
   
3. Comfortable Seat
   Initially, the seat didn’t have a headrest, but I added a Steyr headrest for extra comfort.
   
4. Great Shock Absorption
   The shock absorption is very good, though the backrest cannot fully recline due to limitations with the rear control levers.
   
5. Adjustable Steering Wheel and Storage
   The steering wheel is adjustable, and there’s an air-conditioned storage compartment for drinks during the summer.
   
6. Handbrake and Loader Controls
   The handbrake and loader control handles have a detent button, making them practical and user-friendly. The electronic shifting is smooth and comfortable.
   
7. Spacious Cabin
   The cabin is spacious; I once managed to fit 7 people inside.
   
8. Sound System and Radio
   Although it doesn’t come with a radio, I purchased and installed a cassette player, and the sound system works well with standard connectors.
   

1. Loose Front Axle Bearing Cover
   Shortly after receiving the machine, the front axle bearing cover on the right side came off. The arm cylinder oil pipe started leaking, and the rear axle bolts loosened.
   
2. Hydraulic Oil Cooler and Oil Leaks
   Using the breaker caused significant vibrations, which led to the hydraulic oil cooler’s inlet hose wearing out. The repair was done locally but still experienced some oil leakage.
   
3. Transmission Oil Leaks
   The transmission has had consistent oil leakage. Initially, poor diesel quality caused the diesel pump to fail, requiring a hammer to restart it. A foreign technician confirmed the pump issue, and a replacement was flown in from Singapore.
   
4. Water Infiltration in Engine
   Since the machine has no indoor garage and is stored outside, rainwater often enters through the exhaust pipe, causing starting difficulties. After starting, black liquid would pour from the exhaust, making it hard to clean.
   
5. Exhaust Muffler Rust and Leaks
   Rainwater accumulated at the top of the muffler, causing it to rust and shake. After a short time, the exhaust pipe would come loose, resulting in further damage. I had to replace it for 1,600 RMB.
   
6. Damaged Door from Vehicle Collision
   In 2006, a colleague accidentally damaged the left-side door while operating another vehicle. The door’s hinge was made of cast iron and could not be repaired. The cost for a replacement door was quoted at 16,000 RMB, but I temporarily used a plastic covering until it was replaced after over a year.
   
7. Heavy Tire Wear Due to Large Steering Angle
   The front tires suffer from rapid wear due to the large steering angle. Tires need to be replaced every two years, and removing tires is a challenge due to the vacuum seal. I eventually replaced them with steel-wire tires and had to repair the rear tires at a local shop.
   
8. Electrical Failures
   Since the cabin is well-sealed, the air conditioning was always on when entering. After three years, the fan motor failed, and I replaced it with a cheaper aftermarket model. The new fan works fine but with less airflow and more noise than the original.
   
9. Frequent Issues with Lights and Electrical Components
   The rear lights were damaged during work and had to be replaced. After installation, they still faced issues, such as bulbs melting. I also had to replace the front light switch and brake light switch, modifying them with cheaper parts from the market.
   

I purchased the LiuGong 220L excavator in May 2006 for 620,000 RMB, and it has now accumulated nearly 8,000 working hours. Most of its work has been in earthmoving tasks, and I’ve followed the recommended operation and maintenance protocols. Below is a summary of its performance, which may serve as a reference for those considering purchasing this model.
Advantages

1. Powerful Engine, Reliable Performance
   The excavator is equipped with a Cummins engine that produces 147 horsepower. Even when the throttle is fully opened, fuel consumption does not exceed 20 liters. While I stopped using original engine oil a long time ago, the engine has remained trouble-free.
   
2. Stable Hydraulic System with Minimal Issues
   The rotary pump is from Japan's Kawasaki brand, and I’ve only replaced the gear oil once. The hydraulic main pump is also from Kawasaki, and I regularly replace the pilot and hydraulic filters. The hydraulic system has performed reliably without any major issues.
   
3. Impressive Digging Power, Surpassing Imported Brands
   In terms of digging power, the LiuGong 220L is unbeatable within the 220-series excavators. Even when compared to the Caterpillar 320C, the LiuGong 220L has superior digging force.
   
4. Fast Rotation Speed, Engaging to Operate
   The LiuGong 220L offers exceptional rotation speed, providing a thrilling experience for operators. However, due to the lack of hydraulic cushioning, operators who are not familiar with the machine might find it challenging to control at first.
   
5. Excellent Climbing Ability
   When working alongside other brand excavators on construction sites, the LiuGong 220L consistently demonstrates remarkable climbing ability. It easily ascends areas where European and Japanese brand excavators struggle, especially on steep slopes and rugged terrain.
   

1. Low Quality of Original Bucket
   After 4,000 hours, the original bucket had been patched up multiple times and was no longer usable. I had to replace it with a new 1.1-cubic-meter bucket, which cost me 12,000 RMB.
   
2. Insufficient Track Hardness
   Although the tracks are imported, they lack the necessary hardness. After 2,000 hours of use, the tracks started dragging frequently, and by 4,000 hours, the gear had worn down significantly. Therefore, not all imported parts are of high quality.
   
3. Unreasonable Toolbox Design
   The toolbox is too small, making it difficult to store an 18-liter grease bucket. The real toolbox is only large enough to fit inside the cabin, which makes it inconvenient to access and often causes damage to the seats and interior.
   
4. Rotation Bearing Prone to Cracks (Related to Operator Error)
   After 3,000 hours of use, the rotation bearing developed a significant crack, which had to be welded. The high rotation speed of the LiuGong excavator, combined with inexperienced operators frequently over-rotating and hitting obstacles like tree stumps or working on steep slopes, contributed to the damage.
   
5. Frequent Fuse Failures
   Fuses burn out regularly, requiring frequent replacements. However, operators often don't keep track of the correct number of fuses, leading to further damage to the machine.
   
6. Limited Cabin Space and Poor Comfort
   The cabin is relatively cramped, making it uncomfortable when carrying a helper. After sitting for a while, it becomes tiring. Additionally, the side windows, modeled after Japanese brands, have steel bars that obstruct the operator’s view, creating a safety hazard.
   
7. Poor Sealing, Radio Becomes Useless
   The cabin has poor sealing, allowing dust to easily enter. With operators neglecting cabin upkeep, the result is a dusty and uncomfortable environment. The radio, which was supposed to provide some comfort, didn’t work at all when I first received the machine.
   
8. Simplistic Control Panel with Limited Information
   The control display is very basic, with no audible alarms. It only shows a red light indicator with minimal information, making it easy to overlook important alerts.
   
9. Need for Improvement in Details
   Small issues, such as the air conditioning control and windshield wiper switch breaking due to poor quality buttons, are frequent. Some parts, like the iron wire used to secure the control box, are temporary fixes that should not be necessary in a machine of this caliber.
   

I have been using two Volvo EC210BLC excavators, with the first one purchased in April 2007 and the second in July 2007. Since both excavators are of the same model and started working around the same time, the gap of just three months between their purchases reduces any accidental factors, making their usage experiences quite comparable. Here's a summary of their performance and issues after extensive use.
Issues Encountered During Use:
1. Water Pump Issues
Excavator 1 (Machine #1):

• After 200 hours of operation, the water tank was found to be low, and the problem was traced back to the water pump.
  
• At 1100 hours, the water pump failed and was replaced under warranty. However, after just three months of use, the pump broke again at 1900 hours. Since it was still under warranty, Volvo covered the cost of the replacement.
  
• The water pump failed again at 5300 hours, and this time I had to pay for a new one out of pocket.
  

• At 300 hours, the water pump failed and was replaced under warranty.
  
• The pump failed again at 1600 hours, but Volvo covered the replacement cost.
  
• By 3100 hours, the water pump failed a third time, and I had to purchase a new one from a Volvo dealer.
  
• After replacing the water pump, the machine has run smoothly up to 6100 hours.
  

• The water pump's average lifespan seems to be around 3000 hours, which I find too short for such a critical component. The cost and inconvenience of frequent replacements are significant for users.
  

• At 1200 hours, the small arm cylinder started leaking oil. It was replaced free of charge under warranty.
  
• At 4600 hours, the large arm cylinder began leaking oil, and by 5100 hours, the right-side cylinder had significant leakage, requiring a full replacement.
  
• At 5200 hours, the small arm cylinder started leaking again.
  
• The bucket cylinder began leaking at 5000 hours. While it has not been replaced yet, it's due for replacement soon.
  

• Up until 4500 hours, the excavator had no major issues. However, at 5000 hours, all cylinders started leaking.
  
• The large arm cylinder was completely replaced at 5500 hours due to severe leakage.
  
• At 6000 hours, the small arm and bucket cylinders also experienced significant leakage, necessitating replacement.
  

• Based on my experience, Volvo's piston seals seem to have an average lifespan of around 5000 hours, which is shorter than expected for heavy-duty equipment.
  

• At 800 hours, a small oil line on the distributor leaked significantly, and Volvo replaced it under warranty.
  
• At 2000 hours, the hydraulic system developed multiple oil leaks.
  
• At 3800 hours, the small arm cylinder's oil intake pipe burst.
  
• At 4200 hours, the main oil supply line to the swing motor burst.
  
• At 4600 hours, one of the large pumps had a major oil leak, and I had to pay for a replacement.
  

• From 2000 hours, the hydraulic system began leaking at multiple points.
  
• At 3600 hours, the large arm oil supply pipe burst.
  
• At 3800 hours, the small arm cylinder's oil intake pipe burst, and I had to purchase a new pipe myself.
  

• Both excavators experienced multiple issues with the hydraulic system, including oil leaks and burst pipes, which required several replacements. The cost of repairs for these components is a concern.
  

• The track roller continues to leak oil, even at this stage.
  

• At 6000 hours, the excavator stopped responding during operation, and the electronic valve had to be replaced. The cost of the part was 1500 RMB.
  

In June 2007, my family purchased a second-hand Kobelco SK200-1 excavator. The machine had a rather complicated history, as it was bought from a local user who had imported it from Hong Kong—making it a third-hand machine. At the time, my father was in the truck business, and due to the phasing out of Dongfeng trucks, he decided to switch to excavators. When I heard about the purchase, I was incredibly excited, as I have always had a deep interest in construction machinery, especially excavators and dump trucks.

At the time, the SK200-1 was priced at 420,000 RMB. Many people thought it was a bit expensive, but after nearly three years of use, the machine has never disappointed. In fact, on the construction site, it has earned me a lot of respect. On one occasion, I was working alongside a newer Kobelco SK200-5, and by the end of the day, my excavator had moved more loads. The owner of the SK200-5 couldn’t believe it and asked to see a demonstration. After seeing the results, he admitted that my older machine was indeed faster, which made me feel incredibly proud.

Maintenance and Repairs
I have always been diligent about maintaining this excavator. I change the engine oil every 300 hours, while the hydraulic oil hasn’t been replaced since the purchase. After consulting a professional, I was told that the hydraulic oil was in good condition and didn’t need changing. As for repairs, in the more than two years that I've owned the machine, I’ve replaced the following: the middle pump oil seals twice, the boom pump oil seals once, and one hydraulic line due to corrosion from mud and moisture. The hydraulic line for the operation lever also needed replacing. Other than that, no major parts have been replaced. The original hydraulic pipes and air conditioning system are still intact, and both hot and cold air work perfectly.

Performance and Pros & Cons
Overall, the Kobelco SK200-1 has performed exceptionally well. It is fuel-efficient, powerful, and has a fast swing and travel speed. The electrical system is straightforward and simple, making it more reliable compared to the newer SK200-3 and SK200-5 models. The only downside is that the operation levers feel a bit heavy, but aside from that, everything else works perfectly.

Conclusion
This Kobelco SK200-1 excavator has truly proven the saying “A machine is like its operator; treat it well, and it will treat you well.” Despite being a second-hand machine, it has delivered powerful performance and excellent fuel efficiency. It has become an invaluable asset for our family’s business, consistently delivering great results and saving on operational costs. Even when competing against newer models, the SK200-1 still holds its ground, making it a dependable and worthwhile investment.

Sumitomo Excavators are not just focused on surface-level performance and design; they aim to reflect the real needs of operators and construction sites. Every detail of their machines is carefully crafted to deliver a seamless, intuitive experience with an emphasis on operator comfort, environmental friendliness, and economic efficiency. This focus has resulted in Sumitomo machines consistently excelling in three main areas: exceptional mobility performance, excellent economic efficiency, and outstanding comfort. In this review, we will take a closer look at the Sumitomo SH210-5 excavator to understand what makes it stand out.
Key Specifications of the Sumitomo SH210-5 Excavator:

• Maximum Operating Weight: 19,900 kg
  
• Engine Power: 117.3 kW
  
• Standard Bucket Capacity: 0.5–1.1 m³
  
• Boom/Bucket Arm Length: 5,700 mm / 2,900 mm
  
• Maximum Arm Digging Force: 103 kN
  
• Maximum Bucket Digging Force: 142 kN
  
• Track Width: 600 mm
  

• Responsive Operation: The optimized oil pressure circuit and the sensitivity to operational signals enable smooth transmission of minute force changes, achieving high-level operability.
  
• Increased Stability in Complex Operations: The travel speed adjusts with the amount of upper body input, ensuring stability and efficiency even in rugged or elevated work environments.
  
• Increased Work Output with SP Mode: The integrated SP mode allows for increased work capacity, providing up to 5% more output compared to the previous SH200-3 model.
  
• Automatic Excavation Boost: In heavy digging situations, the machine automatically enhances its digging ability without needing to press additional buttons.
  
• Improved Excavation Speed in Heavy Duty: Hydraulic flow rate reduction is minimized by 7%, ensuring more consistent power during heavy-duty tasks.
  
• Customizable Hydraulic Flow: The addition of extra valve options allows for easy switching between various hydraulic attachment modes, including crushers and dismantling machines.
  

• 20% Reduced Fuel Consumption: The "SIH:S" hydraulic system and the "SPACE5" engine system significantly lower fuel consumption in both SH and H modes.
  
• Automatic and One-Touch Idle Function: The one-touch idle feature automatically enters idle mode, preventing fuel wastage.
  
• Durable Frame Construction: The closed-section frame is highly resistant to external impacts, contributing to the machine’s durability.
  
• Reinforced Arm/Stick: The strength of all connecting parts is improved, ensuring the excavator can withstand harsh work environments and heavy workloads.
  
• M-type Sealed Tracks: The use of high-quality M-type oil seals helps retain grease, reducing wear and tear on the tracks and extending their lifespan.
  
• Large Fuel Tank Capacity: The 410L fuel tank allows for long periods of operation without frequent refueling.
  
• Enhanced Bucket Durability: The bucket is reinforced with thicker, larger bottom plates to improve its durability.
  
• Strengthened Upper Rotating Frame: The upper rotating frame has been reinforced for better rigidity and durability in all types of operations.
  
• New Track Protection Device: The improved track protection system prevents the tracks from detaching and protects the rollers.
  

• Enhanced Visibility: The operator enjoys a clear view not only in front but also in the lower right area, improving safety during operation.
  
• ISO-Compliant Sealed and Pressurized Cabin: The cabin is sealed and pressurized to prevent dust from entering, ensuring a clean environment for the operator.
  
• Ergonomic Cabin Design: The base control box can be tilted for easier entry and exit, while the cabin’s high-strength design increases safety in the event of a rollover.
  
• Anti-Theft and Emergency Features: The excavator is equipped with an anti-theft system, identification device (optional), and an emergency stop button.
  
• Adjustable Horn Sound: The horn volume can be adjusted according to the working environment, such as urban or mountainous areas.
  
• User-Friendly LCD Display & Switch Control Panel: The LCD display features a white backlight for easy visibility, and the control panel is designed for ease of use.
  
• Convenient Cabin Access: Large handrails and anti-slip plates make it easier for the operator to enter and exit the cabin safely.
  
• Comfortable Operator Seat: The seat is fully adjustable with 4-level adjustments, and the operator’s chair is designed for comfort and fatigue reduction.
  
• Floating Suspension Seat (Optional): The optional air-suspended seat further enhances comfort by absorbing shocks and vibrations.
  
• Noise Reduction: The machine is equipped with a low-noise engine, muffler, and soundproofing materials to minimize noise levels and protect the surrounding environment.
  
• Automatic Climate Control: The large round air-conditioning vents allow for better air circulation, and the sealed cabin improves the effectiveness of the air-conditioning system.
  
• AM/FM Radio with One-Touch Mute: The radio comes standard, and the one-touch mute function can be easily activated using the left control lever.
  
• Convenient Storage: The excavator features a variety of storage compartments, including a luggage box, cup holder, and small storage bins.