Common Issues with the Kobelco SK75UR and How to Address Them

[MikePhua]

The Kobelco SK75UR is a popular mini excavator known for its efficiency and reliability, particularly suited for tight spaces and urban construction projects. However, like any machine, it may encounter some common issues over time. This article will outline some of the typical problems with the Kobelco SK75UR and suggest possible solutions.
1. Hydraulic System Failures
Hydraulic system issues are one of the most common problems reported with the Kobelco SK75UR. These can manifest as slow or jerky movements, or the hydraulic arm not operating smoothly. Hydraulic pump performance can decrease due to air in the system or insufficient oil. To resolve hydraulic issues:

• Check Hydraulic Oil Levels: Ensure the oil level is within the manufacturer’s recommended range. If it’s low, top it up with the correct type of hydraulic fluid.
  
• Inspect Seals: Regularly inspect and replace any worn or damaged seals to prevent oil leaks and maintain system pressure.
  
• Clean or Replace Filters: Ensure the hydraulic oil filter is clean and not clogged. Regularly replace filters to avoid system contamination.
  

2. Engine Starting Issues
Some users have reported difficulty starting the Kobelco SK75UR or experiencing a non-starting engine. This is typically related to low battery charge, loose electrical connections, or fuel system issues. Suggested solutions include:

• Check the Battery: Ensure the battery is fully charged and inspect battery terminals for corrosion or loose connections.
  
• Inspect the Fuel System: Check the fuel pump and fuel filters to ensure fuel is flowing smoothly without blockages.
  
• Examine Electrical Connections: Inspect the starter circuit and electrical connections to ensure all components are properly connected and functioning.
  

3. Cabin Noise Problems
Some users have noticed that the cabin of the Kobelco SK75UR can become noisy, especially at higher engine speeds. This noise may originate from engine vibrations or hydraulic system resonance. To reduce noise:

• Check the Engine Cover Seal: Make sure the engine cover is properly sealed to prevent noise from escaping.
  
• Inspect Hydraulic Lines: Loose or damaged hydraulic hoses can cause vibrations and noise. Tighten or replace any damaged hoses.
  
• Perform Regular Maintenance: Ensure the engine and hydraulic systems are properly maintained, and check for potential noise sources during regular servicing.
  

4. Track and Suspension Issues
Loose or worn tracks, or issues with the suspension system, can be common in the Kobelco SK75UR. Loose tracks can affect the machine’s stability and limit its ability to perform efficiently. To address these problems:

• Check Track Tensioning Device: Ensure the track tension is properly adjusted to avoid slack.
  
• Inspect Track Wear: Regularly inspect the tracks for excessive wear. Replace tracks that have worn down significantly.
  
• Examine Suspension Components: If there are issues with the suspension system, it can affect track stability. Inspect and replace any damaged parts of the suspension system.
  

5. Electronic Fault Diagnostic System
The Kobelco SK75UR is equipped with an electronic fault diagnostic system that helps monitor the health of the machine. Sometimes, the system will display error codes that indicate specific issues needing attention. To troubleshoot these codes:

• Refer to the Operator’s Manual: Cross-reference the error code with the operator’s manual to understand the nature of the problem.
  
• Perform Diagnostic Checks: Use a specialized diagnostic tool to conduct a deeper check of the system and identify the issue.
  
• Contact Professional Service: If the issue cannot be resolved independently, contact a qualified technician for further inspection and repair.
  

Conclusion
While the Kobelco SK75UR is a highly efficient mini excavator, it may experience some common issues like any other piece of machinery. Regular maintenance and inspection are essential to keeping the machine running smoothly. By addressing hydraulic system issues, electrical problems, cabin noise, track wear, and diagnosing error codes promptly, operators can ensure the longevity of the equipment and maintain its productivity.