Removing Plugs from Track Rollers on Deere 450B

[MikePhua]

The John Deere 450B is a compact and versatile crawler dozer used in various construction, mining, and forestry applications. One essential maintenance task for maintaining the track system of this equipment is the proper removal of plugs from the track rollers. This task is crucial for ensuring that the rollers operate efficiently, allowing for smooth and consistent movement of the machine. Over time, dirt, debris, and moisture can accumulate in these plugs, which can affect the performance of the tracks and rollers, leading to premature wear and tear.
In this article, we will explore the purpose of the plugs in track rollers, why their removal is necessary, and step-by-step instructions on how to safely and effectively remove them on a Deere 450B.
Understanding the Purpose of Track Rollers and Plugs
Track rollers are vital components in a crawler dozer’s track system. They support the weight of the machine and help distribute the load across the tracks. These rollers are mounted on the undercarriage and allow the tracks to move smoothly over rough terrain, ensuring that the dozer operates effectively.
The plugs in track rollers are designed to protect the internal components of the roller and prevent dirt, water, and other contaminants from entering. However, these plugs can also become a source of trouble if they are not removed and cleaned regularly. If dirt and moisture are allowed to build up inside the rollers, it can cause the bearings to seize, leading to reduced performance, damage, and expensive repairs.
Removing the plugs from the track rollers is a preventive maintenance procedure that allows the internal components to be cleaned and lubricated, which is critical to extending the lifespan of the rollers and maintaining the overall performance of the dozer.
Why Remove the Plugs?

1. Prevent Contamination: Over time, dirt, mud, and other contaminants can accumulate inside the track rollers. This buildup can lead to excessive wear on the bearings and other internal parts, which can result in a loss of functionality or premature failure of the rollers.
   
2. Extend Roller Life: Regularly removing and cleaning the plugs helps to keep the rollers in top condition. By removing debris and applying fresh lubrication, you reduce friction, minimize wear, and improve the overall performance of the rollers.
   
3. Improve Track Performance: Clean, well-maintained rollers ensure smoother operation of the tracks. This results in more efficient movement, better traction, and a reduced risk of breakdowns during operation.
   
4. Lubrication Access: Removing the plugs provides direct access to the roller bearings, allowing for proper lubrication and ensuring that they operate smoothly under heavy loads. Proper lubrication prevents overheating and reduces friction, leading to better performance.
   

Steps for Removing Plugs from Track Rollers on Deere 450B
Before starting the process of removing the plugs, it’s important to have the right tools and materials. You’ll need basic hand tools, including wrenches, screwdrivers, and possibly a rubber mallet or hydraulic jacks for dislodging stubborn plugs. Additionally, be sure to have new seals and lubricants on hand for reassembly.
Here are the general steps for removing the plugs from track rollers on the Deere 450B:

1. Ensure the Machine is Stable
   • Before performing any maintenance, ensure that the dozer is on a flat, stable surface. If necessary, use a hydraulic jack to lift the machine or secure it with blocks to ensure stability during the process.
     
2. Locate the Plugs on the Track Rollers
   • The plugs are typically located at the ends of the track rollers. These plugs are designed to be removable and will often be positioned at the axle or bearing housing. On the Deere 450B, you will find the plugs that cover the bearings, which need to be removed for cleaning and lubrication.
     
3. Remove the Fasteners
   • The plugs are generally held in place by bolts, screws, or other fasteners. Use the appropriate tools to remove these fasteners carefully. Take note of the fastener sizes and types so you can properly reinstall them later.
     
4. Carefully Remove the Plugs
   • Once the fasteners are removed, gently pull the plugs from the rollers. Depending on how long the plugs have been in place, they may be stuck due to dirt buildup or rust. If needed, use a rubber mallet to tap around the edges of the plugs to loosen them without damaging the surrounding components.
     
5. Clean the Interior of the Rollers
   • After removing the plugs, inspect the interior of the track rollers for dirt, mud, and other contaminants. Use a clean rag or brush to remove any debris, and if necessary, apply compressed air to blow out any remaining dirt.
     
6. Lubricate the Bearings
   • Once the rollers are cleaned, apply fresh grease or lubrication to the bearings inside the rollers. This ensures that the internal components are properly lubricated and will function smoothly during operation.
     
7. Inspect for Wear or Damage
   • While the plugs are removed, take the opportunity to inspect the track rollers and bearings for any signs of excessive wear or damage. If you notice any issues, such as cracks or pitting, it may be necessary to replace the rollers or bearings before continuing operation.
     
8. Reinstall the Plugs
   • Once the rollers have been cleaned and lubricated, reassemble the plugs by aligning them back into position. Secure them with the fasteners that were removed earlier. Make sure the plugs are seated properly and tightly to avoid any leaks or issues during operation.
     
9. Test the Track Rollers
   • After reassembling the rollers, perform a test run of the dozer to ensure that the rollers are functioning smoothly and that there are no issues with the track movement. Listen for any unusual noises or vibrations, which may indicate that the rollers need further attention.
     

Preventive Maintenance Tips for Track Rollers
To keep the track rollers in optimal condition, follow these preventive maintenance practices:

1. Regular Inspections: Check the track rollers for signs of wear or damage regularly. Pay close attention to the plugs and ensure they are not cracked, worn, or damaged.
   
2. Keep Rollers Clean: During routine maintenance, remove debris from the rollers and inspect the internal components. Cleaning the rollers regularly will help prevent build-up and ensure smooth operation.
   
3. Use the Right Lubricant: Always use the manufacturer-recommended lubricant for the track rollers. The right type of grease or oil will help reduce friction and prevent excessive wear on the bearings.
   
4. Check Track Tension: Ensure that the tracks are properly tensioned, as over-tightening or loosening the tracks can cause excessive stress on the rollers.
   
5. Monitor for Leaks: If you notice any hydraulic fluid leaking from the plugs or track rollers, take immediate action to fix the issue. Leaks can cause loss of fluid pressure, leading to inefficient operation and potential damage.
   

Conclusion
Removing the plugs from track rollers on a Deere 450B is a straightforward but essential maintenance task that helps extend the life of the machine’s undercarriage components. By regularly cleaning and lubricating the track rollers, you can ensure smooth operation, prevent costly repairs, and improve the overall performance of the machine. With proper care and attention, the Deere 450B can continue to perform reliably on demanding job sites, providing excellent value for contractors and operators alike.