Kobelco SK160 Bi-Directional Auxiliary Hydraulics Issues and Solutions

[MikePhua]

The Kobelco SK160 is a widely used small crawler excavator that offers powerful performance and high maneuverability, especially on construction sites. One of its key features is the bi-directional auxiliary hydraulics system, which improves operational efficiency for specialized tasks. However, some users have reported issues with the bi-directional auxiliary hydraulics system, which affects the machine's ability to perform certain functions. This article will discuss common causes of these issues and provide solutions to help users restore the hydraulic system's optimal performance.
Causes of Bi-Directional Auxiliary Hydraulics System Issues

1. Insufficient Hydraulic Oil Flow
   The bi-directional auxiliary hydraulics system requires a stable and sufficient hydraulic oil flow. If the system is low on oil or there is a leak, hydraulic pressure may become unstable, leading to suboptimal performance.
   Solution
   • Check the hydraulic oil level regularly to ensure it is within the recommended range. Top up with the appropriate hydraulic fluid if necessary.
     
   • Inspect all hydraulic lines and connections to ensure there are no leaks.
     
2. Hydraulic Pump Failure
   The hydraulic pump is the heart of the hydraulic system, responsible for generating the required flow of oil. If the pump fails or develops a fault, the system will not generate enough pressure, causing the auxiliary hydraulics to malfunction.
   Solution
   • Regularly inspect the hydraulic pump for unusual noises or overheating, which may indicate potential issues.
     
   • If the pump is malfunctioning, it should be replaced or repaired to avoid further disruption to the hydraulic system.
     
3. Hydraulic Control Valve Malfunction
   The control valve in the hydraulic system regulates oil flow and pressure. A malfunction, such as sticking or leakage, can prevent the system from accurately controlling the oil flow, affecting the auxiliary hydraulics' performance.
   Solution
   • Periodically check the hydraulic control valve to ensure it is functioning properly.
     
   • If the valve is clogged or leaking, clean or replace the control valve as needed.
     
4. Electrical Control System Issues
   Modern hydraulic systems often feature electronic controls to precisely manage hydraulic movements. Faults in the electrical control system—such as loose wiring, sensor failures, or circuit problems—can lead to issues with activating or adjusting the hydraulic system.
   Solution
   • Inspect electrical connections and wiring to ensure they are secure and not damaged.
     
   • If electrical issues are detected, check the sensors and control unit, repairing or replacing any faulty components.
     
5. Improper Operation
   Sometimes, issues with the bi-directional auxiliary hydraulics can be caused by improper operation. For example, frequent abrupt mode changes or aggressive operation can place undue stress on the hydraulic system, leading to damage.
   Solution
   • Operate the machine smoothly and avoid sudden movements that may put excessive strain on the hydraulic system.
     
   • Follow the equipment’s user manual when switching between modes to ensure it is done correctly.
     

Conclusion
Issues with the Kobelco SK160’s bi-directional auxiliary hydraulics system can stem from various causes, including insufficient hydraulic oil, pump failure, control valve malfunctions, electrical issues, or improper operation. Regular maintenance, including checking hydraulic oil levels, inspecting system components, and ensuring proper electrical connections, is essential to prevent these issues. By addressing these problems promptly and performing necessary repairs, operators can ensure that the machine continues to function at its best, improving efficiency and extending the lifespan of the equipment.