Troubleshooting: One Side Track Will Not Move on My Kobelco Excavator

[MikePhua]

Introduction to the Problem
In the world of construction and heavy equipment, an issue with one side of a track not moving on an excavator can be a serious problem. The Kobelco excavators, known for their reliability and performance, can sometimes experience issues that hinder their operation. One common problem that some operators have faced is when one side of the track does not move, causing the excavator to become imbalanced and difficult to control.
Identifying the Cause of the Issue
The first step in resolving the issue is understanding the potential causes behind why one side of the track is not moving. There are several possible factors at play:

1. Hydraulic System Problems:
   • The most likely cause of the problem is an issue with the hydraulic system. Excavators rely on hydraulics to power the tracks, and any malfunction in the hydraulic system can cause one side to stop moving. This could be due to low hydraulic fluid, a faulty pump, or an issue with the hydraulic valve that controls the track movement.
     
2. Drive Motor or Final Drive Failure:
   • Another potential cause could be a failure in the drive motor or the final drive mechanism on the side that is not moving. If the drive motor is damaged or the final drive has worn out or failed, the track will be unable to receive power and will remain stationary.
     
3. Track Tension Issues:
   • Track tension is another area to check. If one side of the track is too tight or too loose, it could affect the movement. Ensure that both tracks are properly tensioned according to the manufacturer’s specifications.
     
4. Damaged Track or Idler:
   • A damaged track, idler, or any components that affect the movement of the track can also cause this issue. A broken or severely worn track could be unable to engage with the sprocket or gears, rendering it immobile.
     

Steps to Diagnose the Problem
To properly diagnose why one side of the track isn’t moving, follow these steps:

1. Check Hydraulic Fluid Levels:
   • First, check the hydraulic fluid levels to ensure they are within the correct range. Low hydraulic fluid can cause insufficient pressure to the track drive motor. If the fluid is low, top it off and observe if the track starts moving after starting the machine.
     
2. Inspect the Hydraulic Hoses and Valves:
   • Look for any visible leaks or damage to the hydraulic hoses leading to the track motor. Leaks can cause a loss of pressure, preventing the track from moving. Check the hydraulic valves for proper functioning as well.
     
3. Inspect the Drive Motor:
   • If the hydraulic fluid levels are fine and there are no leaks, the next step is to inspect the drive motor and final drive assembly. Check for any unusual noises, signs of overheating, or damage to these components. A malfunction here could prevent the track from being powered.
     
4. Examine Track Tension:
   • Check both tracks to make sure they are properly tensioned. If one track is too loose or tight, it may cause operational problems. Adjust the tension if necessary and see if the track begins to move.
     
5. Check for Mechanical Damage:
   • Examine the track, idler wheels, and sprockets for any visible signs of wear or damage. A worn or damaged track may not mesh properly with the sprockets, causing it to stop moving. Similarly, inspect the idler wheel and any parts that could be impeding the movement.
     

Possible Solutions
Once the issue has been identified, here are some possible solutions:

1. Add Hydraulic Fluid:
   • If the problem was caused by low hydraulic fluid, simply topping it off could resolve the issue. However, if the fluid continues to run low, there may be a leak that needs to be fixed.
     
2. Replace or Repair the Hydraulic Components:
   • If a hydraulic component such as the pump, valve, or track motor is malfunctioning, you may need to replace or repair it. Consult the manufacturer or a professional mechanic for guidance on replacing these parts.
     
3. Replace the Drive Motor or Final Drive:
   • If the drive motor or final drive is damaged, these parts may need to be replaced. This can be a more expensive fix, but it is necessary for the proper functioning of the excavator.
     
4. Adjust the Track Tension:
   • Adjusting the track tension is a simple fix, but it requires careful attention to ensure that both tracks are evenly tensioned according to the manufacturer’s specifications.
     
5. Replace Damaged Track or Idler:
   • If the track or idler wheel is damaged, replacing the worn parts will be necessary. This could involve a cost but will ensure that both tracks are functioning properly.
     

Conclusion
When one side of a track isn’t moving on a Kobelco excavator, it’s important to identify the root cause quickly to minimize downtime and ensure that your machine continues to perform at its best. Start by checking the hydraulic system, drive motor, track tension, and any mechanical damage to components like the track, idler, and sprockets. By systematically inspecting these areas and taking corrective actions, you can restore your machine to full working condition. If the issue is complex, consulting a professional mechanic or technician may be necessary for repairs.