Troubleshooting Final Drive Problems in the TL-26 Track Loader

[MikePhua]

The TL-26 track loader, manufactured by Terex (now part of Volvo), is a versatile and compact piece of heavy equipment commonly used for material handling, digging, and grading in various industries. One of the most critical components of the TL-26 is the final drive, which plays a crucial role in transferring power from the engine to the tracks, enabling the machine to move. Like many other tracked machines, the TL-26 can experience final drive issues that impact its mobility and performance. Identifying, diagnosing, and repairing these problems promptly is essential for maintaining machine efficiency and avoiding costly repairs.
In this article, we will explore common issues related to the final drive on the TL-26, the symptoms that indicate failure, possible causes, and solutions to get your track loader back to optimal performance.
Overview of the TL-26 Track Loader
The TL-26 is a mid-sized, rubber-tracked loader, well-known for its maneuverability and powerful hydraulic system, making it ideal for tight spaces and demanding tasks. The machine is powered by a diesel engine that provides enough power to handle various attachments like buckets, forks, and grapples. The tracks on the TL-26 are driven by the final drive, a mechanical system that transmits the engine’s power to the sprockets, which in turn drive the tracks.
The final drive assembly is made up of several components, including the motor, gearbox, and gears, which work together to provide the necessary torque and movement. Problems with any part of this system can result in poor machine performance, including difficulty moving or loss of power to the tracks.
Key Features of the TL-26:

• Engine: Powered by a diesel engine providing sufficient horsepower for a wide range of tasks.
  
• Operating Weight: Approximately 6,000 to 8,000 pounds, depending on configuration.
  
• Tracks: The tracks are powered by the final drive system, which uses hydraulic and mechanical components.
  
• Hydraulic System: Equipped with a high-flow hydraulic system that powers various attachments.
  

Common Final Drive Issues in the TL-26 Track Loader
The final drive is a critical component, and several issues can arise over time that affect its ability to transfer power to the tracks effectively. Common problems can range from simple wear and tear to more complex mechanical failures.
1. Final Drive Leaks
Leaks in the final drive are a common issue that can lead to the loss of hydraulic fluid, which in turn affects the performance of the drive system.

• Symptoms:
  • Visible oil or hydraulic fluid puddles under the machine.
    
  • Reduced performance, such as sluggish movement or difficulty turning the machine.
    
  • Whining noise or increased friction when the machine is in motion.
    
• Possible Causes:
  • Worn Seals: Over time, the seals on the final drive can wear out or become damaged, allowing fluid to escape.
    
  • Cracked or Damaged Housing: A crack or break in the housing of the final drive can lead to leaks and loss of fluid.
    
  • Loose or Damaged Fittings: Loose bolts or fittings in the system can cause hydraulic fluid to leak.
    
• Solutions:
  • Inspect Seals and Replace if Necessary: If the seals are damaged, they should be replaced to prevent further fluid loss.
    
  • Check for Cracks: Inspect the final drive housing for any cracks or damage. If found, the housing may need to be replaced or repaired.
    
  • Tighten Fittings: Ensure that all fittings, bolts, and connections are tight to prevent hydraulic fluid from leaking.
    

2. Slipping or Loss of Track Power
If the final drive is not properly engaging or transmitting power to the tracks, the TL-26 may experience difficulty moving, resulting in sluggish or erratic behavior.

• Symptoms:
  • Tracks fail to move or move slower than normal despite full throttle.
    
  • Loss of power when trying to climb inclines or perform heavy tasks.
    
  • Unusual noise or vibration coming from the final drive when attempting to move the tracks.
    
• Possible Causes:
  • Low Hydraulic Fluid: Insufficient hydraulic fluid can reduce the effectiveness of the final drive, causing slipping or loss of power.
    
  • Internal Gear Damage: If the gears inside the final drive become worn or damaged, they may not transfer power effectively.
    
  • Worn Hydraulic Motor: A worn or faulty hydraulic motor may not provide enough torque to the final drive, leading to power loss.
    
• Solutions:
  • Check Hydraulic Fluid Levels: Ensure that hydraulic fluid is at the correct level and top off if necessary. If fluid is low, check for leaks.
    
  • Inspect the Gears: Check for any signs of wear, cracks, or damage in the gears inside the final drive. If damaged, the gears will need to be replaced.
    
  • Inspect the Hydraulic Motor: If the hydraulic motor is suspected to be faulty, it may need to be rebuilt or replaced to restore full power.
    

3. Noisy Final Drive
Excessive noise coming from the final drive during operation is a sign that something is wrong with the system. This could indicate internal damage or lack of lubrication.

• Symptoms:
  • A grinding, whining, or clunking noise coming from the final drive during operation.
    
  • Vibration or jerky movements when driving the machine.
    
  • Inconsistent or rough motion of the tracks.
    
• Possible Causes:
  • Worn Bearings or Gears: Bearings and gears inside the final drive can wear out due to age, lack of lubrication, or excessive use.
    
  • Lack of Lubrication: Insufficient lubrication can cause friction between moving parts, leading to noise and wear.
    
  • Contaminated Fluid: Dirty or contaminated hydraulic fluid can cause internal components to grind against each other, producing excessive noise.
    
• Solutions:
  • Lubricate Moving Parts: Ensure that all moving parts in the final drive are properly lubricated. Use the correct type of fluid and top off as necessary.
    
  • Inspect Bearings and Gears: If you hear unusual noise, inspect the bearings and gears for wear. If necessary, replace the damaged components.
    
  • Flush and Replace Hydraulic Fluid: Contaminated fluid should be flushed from the system, and fresh fluid should be added to ensure smooth operation.
    

4. Overheating of the Final Drive
Overheating in the final drive is a critical issue that can lead to damage to the system and even complete failure of the drive.

• Symptoms:
  • Excessive heat coming from the final drive housing.
    
  • Smoke or a burning smell from the drive assembly.
    
  • Erratic or sluggish performance when operating the tracks.
    
• Possible Causes:
  • Overworked or Overloaded: The final drive may be subjected to excessive stress or weight, causing it to overheat.
    
  • Insufficient Cooling: If the machine lacks proper cooling, the final drive may overheat due to poor heat dissipation.
    
  • Contaminated Hydraulic Fluid: Dirty fluid can reduce the ability of the system to cool and lubricate the final drive components effectively.
    
• Solutions:
  • Avoid Overloading the Machine: Ensure that the loader is not being asked to perform tasks beyond its rated capacity.
    
  • Check the Cooling System: Ensure that the machine’s cooling system is functioning properly and that it is effectively dissipating heat from the final drive.
    
  • Change Hydraulic Fluid: If fluid contamination is suspected, flush the system and replace the fluid to restore proper lubrication and cooling.
    

Routine Maintenance Tips for the TL-26 Final Drive
Regular maintenance of the final drive is essential for preventing breakdowns and prolonging the life of the system. Below are some tips to keep the final drive operating smoothly:

1. Inspect for Leaks Regularly: Check the final drive and hydraulic system for leaks, especially around seals and fittings.
   
2. Change Hydraulic Fluid: Perform routine changes to hydraulic fluid and replace filters to ensure the system runs clean and efficiently.
   
3. Monitor Track Tension: Maintain the proper tension on the tracks to prevent undue stress on the final drive system.
   
4. Lubricate Components: Ensure that all moving parts in the final drive are regularly lubricated to minimize friction and wear.
   
5. Conduct Regular Inspections: Periodically inspect the final drive, gears, bearings, and hydraulic motor for any signs of damage or wear.
   

Conclusion
The TL-26 track loader is a reliable and powerful machine, but like all heavy equipment, it requires proper care and attention to maintain its performance. The final drive is a critical component, and common issues such as leaks, loss of power, excessive noise, and overheating can severely affect the loader’s ability to operate efficiently. By following proper troubleshooting techniques, performing regular maintenance, and addressing issues promptly, operators can keep their TL-26 running smoothly and avoid costly repairs.