New Track Chain for Komatsu D37EX-21: Considerations and Tips

[MikePhua]

Introduction
The Komatsu D37EX-21 is a reliable and powerful crawler dozer, widely used in various construction and excavation projects. One of the critical components for maintaining its performance is the track system, which includes the track chain. Over time, the track chain can wear down due to heavy usage, harsh terrain, and other operational factors, leading to the need for replacement. This article explores the considerations and steps involved in replacing the track chain on a Komatsu D37EX-21, offering guidance to help operators and fleet managers make informed decisions.
Why Replace the Track Chain?
Track chains are subject to wear and tear because they are constantly in contact with the ground, supporting the machine's weight and enabling mobility across rough surfaces. Over time, components such as the links, pins, bushings, and rollers experience wear, which can result in:

• Reduced traction and stability.
  
• Increased fuel consumption.
  
• Slower operation and potential equipment failure.
  
• Irregular wear patterns that lead to further mechanical issues.
  

Replacing the track chain ensures that the dozer remains operational and efficient, preventing further damage to the undercarriage and other critical components.
Selecting the Right Track Chain for the Komatsu D37EX-21
When replacing the track chain on the Komatsu D37EX-21, it is essential to choose the right parts that are compatible with the machine's specifications. Here are some key factors to consider:

1. Track Chain Quality
   • It's crucial to choose high-quality replacement track chains that meet Komatsu's standards. The quality of the chain can significantly affect the machine's performance and longevity. Opting for OEM (Original Equipment Manufacturer) parts ensures compatibility and durability, but aftermarket parts can also be a cost-effective alternative if they meet or exceed OEM standards.
     
2. Track Width and Length
   • Make sure the track chain's width and length are suitable for the Komatsu D37EX-21. The track chain needs to match the specifications for the undercarriage, as mismatched parts can lead to improper installation and performance issues.
     
3. Track Type
   • The Komatsu D37EX-21 can be fitted with different types of tracks depending on the terrain and working conditions. For example, there are rubber tracks, steel tracks, and heavy-duty tracks for aggressive environments. Ensure that the track type matches the machine's intended use and operational environment.
     
4. Pins and Bushings
   • Over time, pins and bushings can wear out, which can affect the overall performance of the track chain. When replacing the track chain, it's essential to inspect and replace the pins and bushings to ensure smooth movement and minimize wear on the new chain.
     
5. Track Tension
   • Proper track tension is essential for optimal performance. When replacing the track chain, ensure that the tension is adjusted according to the manufacturer's guidelines. Incorrect tension can cause premature wear or damage to the undercarriage.
     

Steps for Replacing the Track Chain on the Komatsu D37EX-21
Replacing the track chain on the Komatsu D37EX-21 is a complex task that requires careful planning and precision. Here’s a step-by-step guide to help with the replacement process:

1. Prepare the Equipment
   • Ensure that the dozer is on a level surface and that all safety precautions are in place. The engine should be turned off, and the machine should be securely blocked to prevent any movement during the process.
     
2. Lift the Dozer
   • Use an appropriate lifting mechanism (such as a jack or hydraulic lift) to raise the dozer off the ground, providing enough clearance to remove the old track chain and install the new one.
     
3. Remove the Old Track Chain
   • Use the proper tools, such as a hydraulic track adjuster, to loosen the track tension. Then, use a track removal tool to detach the track from the sprockets and rollers. Take care to keep track components organized for proper disposal or potential re-use.
     
4. Inspect the Undercarriage
   • Before installing the new track chain, inspect the undercarriage components such as the rollers, sprockets, and idlers for any signs of wear or damage. Replace any worn-out components to ensure proper performance and to prevent future issues.
     
5. Install the New Track Chain
   • Carefully install the new track chain, ensuring that the pins and bushings are aligned correctly. Use the hydraulic track adjuster to tension the track properly, ensuring it is neither too loose nor too tight.
     
6. Test the Installation
   • Once the new track chain is installed, lower the dozer back onto the ground. Test the movement of the tracks by operating the machine at low speeds to ensure proper functionality. Check for any unusual noises or resistance.
     
7. Adjust Tension and Monitor Performance
   • After a few hours of operation, recheck the track tension and adjust if necessary. Regularly monitor the performance of the new track chain to ensure it is wearing evenly and efficiently.
     

Costs of Replacing Track Chains
The cost of replacing the track chain can vary significantly based on several factors, including the brand and quality of the replacement parts, labor costs, and any additional repairs needed for the undercarriage. Typically, replacing the track chain can be a significant investment, but it is necessary for the long-term health of the dozer.

• Track Chain Costs: OEM track chains tend to be more expensive than aftermarket options. Depending on the brand and quality, replacement chains can range from a few thousand dollars to over $10,000.
  
• Labor Costs: Depending on the complexity of the installation and labor rates in your area, labor costs can range from $500 to $2,000 or more.
  
• Additional Parts: If other undercarriage components like sprockets, rollers, or idlers need to be replaced, the overall cost will increase.
  

Conclusion
Replacing the track chain on a Komatsu D37EX-21 is a significant maintenance task that requires attention to detail, proper tools, and the right replacement parts. By selecting high-quality chains and properly installing them, operators can ensure the dozer remains in peak operating condition, minimizing downtime and maximizing productivity. Regular inspections of the undercarriage and timely track chain replacements will help extend the life of the machine and reduce costly repairs in the future.