CX160B Low Track Power and Whiny Pump Noise Issue Solution

[MikePhua]

The CX160B is a widely used mid-sized tracked excavator for construction and engineering projects. Many operators may experience issues such as low track power and whiny pump noise during operation. Addressing these issues is critical for restoring normal functionality and extending the life of the equipment. This article explores the common causes of these issues and the solutions to resolve them.
Common Causes of Low Track Power

1. Hydraulic System Pressure Issues
   • Cause: The hydraulic system is responsible for driving the track system. If the hydraulic system fails to generate sufficient pressure, the track power output will be affected, leading to slow movement or a lack of power.
     
   • Solution: Check the hydraulic system pressure to ensure the hydraulic pump is delivering adequate pressure to drive the tracks. If pressure is insufficient, repair or replace the hydraulic pump as necessary.
     
2. Hydraulic Fluid Quality Problems
   • Cause: The quality of hydraulic fluid directly affects the hydraulic system’s performance. If the fluid is old or contaminated, it can cause a reduction in system efficiency, affecting track power.
     
   • Solution: Regularly inspect the hydraulic fluid for cleanliness and quality. If the fluid is degraded, replace it and clean the filters to maintain the optimal operation of the hydraulic system.
     
3. Clogged or Leaking Hydraulic Lines
   • Cause: Blockages or leaks in the hydraulic lines can impede the flow of hydraulic fluid, which in turn reduces the available power to drive the tracks.
     
   • Solution: Inspect the hydraulic lines for any blockages or leaks. Repair or replace damaged lines and ensure proper seals to prevent any further fluid loss.
     
4. Drive Motor Issues
   • Cause: A malfunction in the track drive motor can also cause insufficient power. Wear and tear inside the motor may reduce the efficiency of the drive.
     
   • Solution: Inspect the track drive motor for performance issues. If necessary, replace or repair the motor to restore optimal functionality.
     

Common Causes of Whiny Pump Noise

1. Worn Pump Bearings
   • Cause: Over time, the bearings in the pump can wear out, leading to unusual noises. Worn bearings can also impact the overall performance of the pump.
     
   • Solution: Check the pump bearings for wear. If found damaged, replace them and inspect the entire pump for any further issues.
     
2. Contaminated Hydraulic Fluid
   • Cause: Contaminants or moisture in the hydraulic fluid can adversely affect the pump’s performance, causing it to make whiny or squealing noises.
     
   • Solution: Regularly check the hydraulic fluid’s cleanliness. Replace contaminated fluid and clean the hydraulic system to prevent further damage.
     
3. Damaged Internal Pump Components
   • Cause: The internal components of the pump, such as gears and vanes, may wear out or become damaged, leading to abnormal sounds and reduced pump efficiency.
     
   • Solution: Inspect the internal parts of the pump, especially gears and vanes, for wear or damage. Replace any defective components or the entire pump if necessary.
     
4. Faulty Pump Control Valve
   • Cause: A malfunction in the pump’s control valve can lead to inconsistent pressure, causing the pump to operate noisily.
     
   • Solution: Inspect the pump’s control valve for proper operation. If there are any signs of malfunction, adjust or replace the valve.
     

Steps to Resolve the Issues

1. Check Hydraulic System Pressure
   • Use a pressure gauge to check the hydraulic system’s operating pressure. Ensure the hydraulic pump is capable of providing sufficient pressure to operate the tracks. If pressure is low, inspect the pump and pressure relief valve, and perform necessary repairs.
     
2. Replace Hydraulic Fluid
   • Regularly check the quality of the hydraulic fluid and replace it if it’s contaminated or aged. Ensure that new fluid meets the specifications for the machine, and clean the filters to prevent contamination in the system.
     
3. Inspect and Replace Pump Components
   • Perform a thorough inspection of the pump system, especially the bearings, gears, vanes, and control valve. Replace any worn or damaged components to restore the pump’s normal function.
     
4. Inspect Track Drive Motor and Lines
   • Examine the track drive motor for issues and ensure the hydraulic lines are free of leaks or blockages. Repair or replace any faulty components to improve track power.
     

Conclusion
Low track power and whiny pump noise on the CX160B excavator are often caused by issues such as hydraulic pressure loss, poor fluid quality, pump component wear, or drive motor malfunction. By performing regular maintenance, checking the hydraulic system’s pressure, replacing contaminated fluid, and repairing or replacing faulty pump components, these issues can be effectively resolved. Prompt maintenance not only restores the machine’s efficiency but also extends its lifespan, ensuring reliable performance on the job site.