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CAT 931 Track Tension Grease Fitting Removal: Solutions and Tips
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The CAT 931 track loader is a well-known, versatile piece of equipment widely used in construction, landscaping, and agriculture. Like all heavy machinery, regular maintenance is essential to ensure longevity and optimal performance. One of the routine maintenance tasks for the CAT 931 involves the track tension system, which requires regular lubrication. However, over time, the grease fittings (also known as zerks) can become clogged or damaged, causing difficulties during the grease application process.
This article provides a detailed look at how to handle issues related to the track tension grease fittings on the CAT 931, with a focus on removing and replacing the fittings when necessary.
Understanding the Track Tension System in the CAT 931
The track tension system on the CAT 931 is crucial for maintaining the proper tension on the tracks, which is essential for efficient operation and to prevent premature wear of the tracks and undercarriage. The system consists of hydraulic cylinders that adjust the tension of the track, and grease fittings (zerks) are used to inject grease into the system to keep it functioning smoothly.
Lubricating these fittings ensures that the track tension remains consistent, preventing issues like slipping or stretching of the tracks. Proper lubrication also helps protect the system’s components from corrosion and wear. However, over time, dirt, debris, or corrosion can cause these grease fittings to become blocked, which hampers their ability to function correctly.
Common Issues with Grease Fittings on the CAT 931
  1. Blocked or Clogged Grease Fittings
    The most common issue with grease fittings on the CAT 931 is blockages caused by dirt, old grease, or corrosion. If the grease cannot flow properly, it may lead to inadequate lubrication, resulting in track tension problems and increased wear on the undercarriage.
  2. Damaged or Stripped Threads
    Over time, grease fittings can wear down or become damaged due to repeated use or improper handling. If the fitting threads are stripped or damaged, it can make the fitting difficult to remove or replace.
  3. Leaking Fittings
    In some cases, the grease fitting might develop a leak, causing grease to escape during the lubrication process. Leaking fittings can lead to grease loss, increased maintenance costs, and inefficient lubrication.
  4. Corroded Fittings
    Exposure to dirt, moisture, and harsh operating conditions can cause grease fittings to corrode. Corrosion makes the fittings difficult to remove or replace and can also damage the surrounding components.
Steps for Removing and Replacing Grease Fittings on the CAT 931
If you're facing issues with blocked, damaged, or corroded grease fittings on your CAT 931, here’s a step-by-step guide to help you remove and replace them:
  1. Preparation
    • Ensure Safety: Before performing any maintenance, make sure the track loader is securely parked and the engine is off. Engage the parking brake to prevent any unintended movement during the repair.
    • Gather Tools: You will need a few basic tools to remove and replace the grease fittings. These include a grease gun, grease fitting wrench, penetrating oil, needle or pick tool, and a new grease fitting (zerc).
  2. Inspect the Grease Fitting
    • Begin by inspecting the grease fitting that you need to remove. Check for signs of damage, corrosion, or blockage. If the fitting is simply blocked, you may be able to clear it using a pick tool or a needle to break through the blockage.
    • If the fitting is corroded or stripped, it may require removal and replacement.
  3. Apply Penetrating Oil
    • If the grease fitting is corroded or stuck, apply a penetrating oil such as WD-40 to loosen the fitting. Allow it to sit for a few minutes to break down the rust and corrosion.
  4. Remove the Old Fitting
    • Use a grease fitting wrench or socket to remove the damaged or blocked grease fitting. If the fitting is stripped or stubborn, you may need to use a small pair of pliers or vice grips to remove it carefully. Make sure not to damage the threads of the fitting hole.
  5. Clean the Fitting Hole
    • Once the old fitting is removed, clean the fitting hole thoroughly using a wire brush or a small cleaning tool. This ensures that the new grease fitting will have a clean, corrosion-free surface to seat into, preventing future leaks or blockages.
  6. Install the New Grease Fitting
    • Apply a small amount of anti-seize lubricant to the threads of the new grease fitting to prevent it from seizing in the future. Carefully screw the new fitting into place, tightening it with the grease fitting wrench or socket. Be sure not to over-tighten, as this could damage the fitting or the surrounding area.
  7. Test the New Grease Fitting
    • Once the new fitting is installed, use a grease gun to check for leaks. Apply grease slowly and check for any escaping grease around the fitting. If there are no leaks, the fitting is correctly installed and ready for use.
Tips for Preventing Grease Fitting Issues
  1. Regular Maintenance
    • One of the best ways to prevent grease fitting issues is to regularly inspect and maintain the fittings. Lubricating the tracks frequently and ensuring that the fittings are free of dirt and debris can prevent clogs and ensure that the track tension remains optimal.
  2. Keep the Area Clean
    • Keep the area around the grease fittings clean to avoid dirt and debris from entering the fittings during operation. Dirt is one of the leading causes of blocked fittings, so cleaning the area regularly is essential.
  3. Use High-Quality Grease
    • The type of grease you use can affect the performance of the fittings. Always use the manufacturer’s recommended high-quality grease for your CAT 931 to ensure smooth operation and to reduce the chances of clogging or damage.
  4. Monitor for Leaks
    • After each lubrication session, check for any grease leaks around the fittings. If you notice any leaks, it’s a sign that the fitting may need to be replaced or that the surrounding area is damaged.
Real-World Example: Resolving Track Tension Issues
One operator shared their experience with a CAT 931 where the grease fittings had become blocked, leading to uneven track tension and premature wear on the tracks. The operator initially struggled with lubricating the tracks, but after cleaning and replacing the blocked fittings, the track tension returned to normal, and the machine operated more smoothly. This repair not only saved the operator money by preventing further damage but also ensured that the equipment was in top condition for the long haul.
Conclusion: Keeping Your CAT 931 in Top Shape
Proper lubrication and maintenance of the grease fittings are essential for the CAT 931 to perform at its best. By regularly checking the fittings and addressing any issues such as clogs, leaks, or corrosion, you can extend the life of the track loader, improve its performance, and reduce the risk of costly repairs. Whether you're replacing a damaged fitting or simply clearing a blockage, staying on top of maintenance will ensure your CAT 931 operates smoothly and efficiently for years to come.
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CAT 931 Track Tension Grease Fitting Removal: Solutions and Tips - by MikePhua - Yesterday, 06:21 PM

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