Troubleshooting the Kobelco SK200SR: Tracks and Swing Issues

[MikePhua]

The Kobelco SK200SR, a popular model in the compact excavator range, is known for its power, precision, and versatility. However, like all machines, it’s not immune to mechanical issues. One common concern among operators is problems related to the tracks and swing mechanisms, which are crucial for the machine's movement and stability. In this article, we’ll delve into these issues, explore potential causes, and provide tips for troubleshooting the Kobelco SK200SR, drawing on real-world examples and expert advice from the field.
Understanding the Kobelco SK200SR and Its Key Components
The Kobelco SK200SR is designed for a wide range of tasks, including construction, demolition, and heavy lifting. It features a robust hydraulic system, advanced control technology, and a powerful engine, making it a preferred choice for those seeking efficiency in compact spaces. The machine is equipped with a tracked undercarriage for stability, combined with a swing mechanism that allows it to rotate the upper structure.
The tracks provide essential mobility on rough terrains, while the swing function enables the machine to move its arm and bucket across a large arc without repositioning the entire excavator. Problems with either of these components can severely hinder the machine’s performance and productivity.
Track Issues: Common Causes and Fixes
When the tracks of the Kobelco SK200SR start to show problems, they can cause significant disruptions to operation. Track issues can manifest in several ways, including uneven wear, jerky movement, or even the tracks coming off the rollers.

1. Track Tension Problems
   The most common track issue is improper tension. If the tracks are too tight, it can cause excess wear on the undercarriage components, leading to overheating and premature failure. Conversely, loose tracks can slip off the rollers or cause inefficient power transfer from the engine.
   Fix: Regularly check track tension according to the manufacturer’s recommendations. In most cases, Kobelco excavators use an adjustable hydraulic tensioning system, which makes it easy to adjust the track tension on-site. Keeping the tracks within the optimal tension range will extend the life of the undercarriage and improve operational efficiency.
   Real-World Example: A contractor working on a demolition project in California encountered frequent track derailment issues with his Kobelco SK200SR. Upon inspection, it was found that the tension was too loose, causing the tracks to slip off during sharp turns. After adjusting the tension, the problem was resolved, and the excavator continued to perform without further disruptions.
   
2. Track Alignment Issues
   Track misalignment can result from worn sprockets, damaged rollers, or debris buildup around the undercarriage. Misaligned tracks can cause uneven wear and a reduction in overall machine stability, which is particularly problematic when working on steep or uneven ground.
   Fix: Regularly inspect the sprockets, rollers, and track components for damage. Clear any debris or dirt that may be causing misalignment. If the rollers or sprockets show signs of wear, they should be replaced promptly to avoid further damage.
   Example: In a mining operation in Nevada, operators found that the tracks of a Kobelco SK200SR were misaligned due to buildup of dirt and debris around the rollers. After a thorough cleaning and adjustment, the machine returned to normal operation without further track issues.
   

Swing Problems: Causes and Solutions
The swing mechanism of the Kobelco SK200SR allows the upper structure of the excavator to rotate, providing flexibility in positioning the arm and bucket. Swing problems are often associated with hydraulic issues, mechanical wear, or electrical malfunctions.

1. Slow or Sticking Swing
   A common complaint from operators is that the swing function either becomes too slow or gets stuck at certain points. This can be caused by issues in the hydraulic system, such as low fluid levels, air in the lines, or a failing swing motor.
   Fix: Start by checking the hydraulic fluid levels. If low, top it up with the recommended fluid. If the fluid is contaminated or appears burnt, it’s a sign that the hydraulic system may need a full flush and refill. Additionally, inspect the swing motor for signs of wear or damage. If needed, the motor should be replaced or repaired.
   Example: On a construction site in Texas, an operator noticed that the swing movement was sluggish, making it difficult to position the bucket accurately. A quick inspection revealed that the hydraulic fluid was low and had a burnt smell. After topping up the fluid, the swing returned to normal operation.
   
2. Swing Cylinder Leaks
   Hydraulic leaks are another common cause of swing problems. Leaks in the swing cylinder can result in a loss of hydraulic pressure, which directly affects the swing speed and smoothness.
   Fix: Inspect the swing cylinder and associated hydraulic lines for any visible leaks. If a leak is found, the cylinder or seals may need to be replaced. Additionally, check the hydraulic filter and valve for signs of wear.
   Real-World Scenario: An excavation company in Florida faced intermittent swing issues with their Kobelco SK200SR. The problem was traced to a small hydraulic leak in the swing cylinder. Once the cylinder was resealed, the swing function returned to full strength.
   

Diagnosing and Preventing Future Problems
Proper maintenance is the key to diagnosing and preventing track and swing issues. Here are a few tips for ensuring that your Kobelco SK200SR remains in top working condition:

1. Regular Inspections
   Schedule regular inspections for both the tracks and the swing mechanism. For tracks, pay close attention to tension, alignment, and wear. For the swing mechanism, check hydraulic fluid levels, inspect the swing motor, and monitor for any signs of leaks or performance issues.
   
2. Proper Lubrication
   Keeping the undercarriage well-lubricated is essential for preventing excessive wear. Apply lubricant to the rollers, idlers, and sprockets regularly to ensure smooth movement.
   
3. Routine Hydraulic System Maintenance
   The hydraulic system is at the heart of many of the SK200SR’s functions, including the swing. Regularly check and replace hydraulic fluid, and replace filters according to the manufacturer’s guidelines.
   
4. Load Management
   Overloading the excavator can cause excessive strain on the tracks and swing mechanism, leading to premature wear. Make sure to follow the machine’s rated load capacity and avoid pushing the machine beyond its limits.
   

Conclusion: Keeping the Kobelco SK200SR Running Smoothly
The Kobelco SK200SR is a powerful and efficient machine that can handle a wide variety of tasks. However, as with any heavy equipment, it’s susceptible to issues with its tracks and swing mechanism. By understanding the potential causes of these problems and performing regular maintenance, operators can keep their machines running smoothly and avoid costly downtime.
In the field, the ability to troubleshoot and resolve issues quickly is essential to maintaining productivity. Whether it’s adjusting track tension or addressing hydraulic issues with the swing, understanding the underlying causes and solutions can help keep your Kobelco SK200SR operating at peak performance for years to come.