Mitsubishi MS140-2 Excavator: Track Rollers and Maintenance Insights

[MikePhua]

The Mitsubishi MS140-2 excavator is a versatile and reliable machine commonly used in construction and excavation projects. As with any piece of heavy machinery, maintaining its components is crucial to ensure longevity and performance. One such vital part of the MS140-2 excavator’s undercarriage system is the track rollers. These components are essential for providing smooth movement and supporting the weight of the machine as it moves over various surfaces. Understanding their function, common issues, and how to maintain them properly is key to keeping your Mitsubishi MS140-2 excavator in top condition.
The Role of Track Rollers in Excavators
Track rollers are part of the undercarriage system of an excavator and are designed to support the weight of the machine while ensuring smooth movement over different terrains. In the case of the Mitsubishi MS140-2, the track rollers serve several functions:

1. Weight Distribution: The rollers help distribute the weight of the excavator evenly across the tracks. This is important for preventing uneven wear and tear, ensuring that the machine maintains balance during operation.
   
2. Track Movement: They facilitate the movement of the tracks, enabling the excavator to travel over rough and uneven terrain. The rollers are crucial for minimizing friction and ensuring efficient movement, especially in challenging environments.
   
3. Reducing Stress: By absorbing shock and reducing stress on other undercarriage components like sprockets and idlers, track rollers help increase the overall lifespan of the excavator.
   
4. Stability: The rollers help maintain the stability of the excavator by providing consistent support as the tracks move. They prevent the tracks from sagging or becoming misaligned during operation.
   

Common Issues with Track Rollers on the Mitsubishi MS140-2
While track rollers are durable, they are subjected to constant wear and tear due to the demands of excavation and construction work. Over time, they can develop various issues that may impact the performance and efficiency of the Mitsubishi MS140-2 excavator.

1. Excessive Wear
   One of the most common issues with track rollers is excessive wear. This can happen due to prolonged use, poor maintenance, or operating the excavator in harsh conditions. As the rollers wear down, they may not function as effectively, leading to increased friction and inefficient track movement.
   Solution: Regularly inspect the track rollers for signs of wear, especially when operating on rough or abrasive surfaces. If the rollers show significant wear, it is advisable to replace them before they cause damage to other undercarriage components.
   
2. Misalignment or Tracking Issues
   Misalignment of the track rollers can cause tracking issues, where the excavator’s tracks are not running straight. This can result in uneven wear of the tracks and poor performance.
   Solution: Regularly check the alignment of the track rollers to ensure they are properly positioned. If you notice the tracks are not aligned correctly, it may be necessary to adjust the tension or alignment of the rollers. Consult the machine’s manual for proper adjustment procedures.
   
3. Seal Failures and Leaks
   Track rollers are sealed units designed to keep dirt, debris, and moisture out of the bearings. Over time, seals may fail, leading to leaks of lubricant and contamination of the bearings, which can cause the rollers to seize up or wear out prematurely.
   Solution: Inspect the track rollers regularly for leaks or signs of damaged seals. If the seals are compromised, replacing them promptly can prevent further damage to the roller system.
   
4. Damage from External Forces
   Track rollers can be damaged by external forces such as impacts from rocks or debris, especially in construction environments with heavy material handling. If the rollers become bent or cracked, it can cause uneven movement or failure.
   Solution: Avoid working in areas with large debris or rocks that could damage the track rollers. If the rollers sustain visible damage, replace them immediately to maintain the stability and performance of the excavator.
   

Maintaining Track Rollers on the Mitsubishi MS140-2
Proper maintenance is essential to ensure the longevity and functionality of the track rollers on your Mitsubishi MS140-2 excavator. Here are a few key maintenance practices to keep in mind:

1. Regular Lubrication
   Proper lubrication is essential for the smooth operation of track rollers. Ensure that the rollers are regularly greased to reduce friction and wear on the bearings. Check the grease levels and apply lubrication according to the manufacturer's recommendations, typically after every 50 to 100 hours of operation, depending on usage.
   
2. Track Tension Adjustment
   Maintaining the correct track tension is critical for preventing undue stress on the track rollers. Over-tightening the tracks can cause excessive pressure on the rollers, while loose tracks can lead to misalignment and inefficient movement. Regularly check the track tension and adjust it as needed to maintain optimal performance.
   
3. Inspect for Debris
   Tracks and rollers can accumulate dirt, mud, and debris, which can cause premature wear. Regularly clean the tracks and inspect the rollers for any signs of blockages or debris buildup. A simple wash after a day of work can go a long way in preventing long-term damage.
   
4. Check for Oil Leaks
   Oil leaks from the track rollers are a sign that the seals may be failing. Regularly check for signs of oil around the rollers. If oil leakage is detected, the seals should be replaced as soon as possible to avoid further damage to the roller system.
   
5. Monitor Roller Condition
   Periodically check the track rollers for any signs of wear, cracks, or bent components. Keeping an eye on the condition of the rollers can help identify problems early and avoid expensive repairs down the line. Replace any rollers that show signs of significant damage.
   
6. Proper Storage
   If the Mitsubishi MS140-2 excavator is not in use for extended periods, store it in a sheltered area to protect it from the elements. Prolonged exposure to moisture and dirt can accelerate wear on the track rollers, so keeping the machine clean and dry during downtime can help maintain the longevity of the rollers.
   

Conclusion
The Mitsubishi MS140-2 excavator is a highly capable machine, and its track rollers are vital for ensuring smooth and efficient operation. While they are subjected to significant stress during regular use, with proper maintenance, these components can last a long time. By performing regular inspections, lubricating the rollers, and keeping the undercarriage clean, operators can prevent many of the common issues associated with track rollers.
In addition to ensuring the longevity of the track rollers, maintaining the overall undercarriage system of the excavator helps avoid costly repairs and downtime. By following these maintenance tips, operators can keep their Mitsubishi MS140-2 excavator performing at its best, whether on construction sites, digging projects, or in harsh environments.