Using ThreeBond 1102 for Bedding Hitachi Swing Bearing: A Complete Guide

[MikePhua]

When working on heavy equipment, specifically with machinery like Hitachi excavators, ensuring that parts are securely fastened and maintained is essential for optimal performance. One critical component in this regard is the swing bearing, which plays a key role in the rotation of the upper structure of the machine. To ensure the longevity and proper functioning of the swing bearing, using the right bedding compound is crucial. ThreeBond 1102, a well-known product, is often used for this purpose. This article provides a comprehensive guide on using ThreeBond 1102 to properly bed the swing bearing on Hitachi equipment.
What is ThreeBond 1102?
ThreeBond 1102 is a high-performance, fast-curing sealant and adhesive used in the automotive and machinery industries. It is designed for high-strength applications where components need to be firmly bonded. The product is often used for sealing and bedding tasks, making it a popular choice for applications like securing bearings, flanges, and other mechanical parts. Its ability to form a strong, durable seal makes it ideal for heavy equipment applications like the bedding of swing bearings on excavators.
Why Use ThreeBond 1102 for Bedding the Swing Bearing?
The swing bearing on a Hitachi excavator is a critical part of the machine's structure. It allows the upper portion of the excavator to rotate smoothly while supporting heavy loads. To maintain the stability and integrity of this bearing, it is essential to ensure that it is properly bedded in place.
ThreeBond 1102 is well-suited for this task for several reasons:

1. Strong Bonding – ThreeBond 1102 provides a high-strength adhesive that securely bonds the bearing to its housing, ensuring that the bearing stays in place under heavy loads and high stresses.
   
2. Sealant Properties – In addition to bonding, ThreeBond 1102 offers excellent sealing properties, preventing contaminants like dust, dirt, and moisture from entering the bearing area and causing wear or corrosion.
   
3. Durability – The product is known for its durability, making it ideal for outdoor, heavy-duty applications where it will be exposed to high temperatures and physical stresses over long periods.
   
4. Resistance to Vibration and Shock – Hitachi excavators often work in environments with significant vibration and shock loads. ThreeBond 1102 can absorb these stresses and ensure that the swing bearing remains securely in place even in the harshest operating conditions.
   

Steps to Use ThreeBond 1102 for Bedding the Swing Bearing
Here’s a step-by-step guide to using ThreeBond 1102 for bedding the swing bearing on a Hitachi excavator:

1. Prepare the Surface
   • Before applying ThreeBond 1102, make sure that the surfaces to which the swing bearing will be bedded are clean and free from dirt, grease, oil, and other contaminants. Use a solvent or cleaning agent to thoroughly clean both the bearing housing and the bearing itself.
     
2. Apply the ThreeBond 1102 Sealant
   • Once the surfaces are clean and dry, apply an even layer of ThreeBond 1102 to the mating surface of the bearing housing. You don’t need to use excessive amounts; just a thin, even layer will suffice. Ensure that the sealant covers the entire surface to create a uniform bond.
     
3. Position the Bearing
   • Carefully position the swing bearing onto the housing. It is important to ensure that the bearing is aligned properly. The sealant will begin to set quickly, so make sure the bearing is correctly placed before it starts curing.
     
4. Torque the Bolts
   • Once the bearing is in place, secure it with the appropriate bolts or fasteners. Follow the manufacturer’s recommended torque settings to ensure that the bearing is properly fastened without over-tightening, which could lead to damage.
     
5. Allow the Sealant to Cure
   • ThreeBond 1102 is a fast-curing product, but it is important to allow enough time for the sealant to fully cure. The curing time may vary depending on the temperature and humidity, but generally, it will take 24-48 hours to achieve maximum bond strength.
     
6. Check for Leaks
   • After the sealant has cured, check the bearing area for any signs of leaks or seepage. If there are any issues, you may need to reapply the sealant or check the installation for errors.
     

Tips for a Successful Bedding Process

1. Work in Clean Conditions – Cleanliness is crucial when bedding a bearing. Any dirt or debris between the bearing and housing can compromise the bond and lead to premature failure.
   
2. Follow Manufacturer Guidelines – Always refer to the specific guidelines provided by Hitachi or the swing bearing manufacturer. These will ensure that you follow the correct procedure and avoid mistakes during installation.
   
3. Use the Right Tools – Proper tools, such as torque wrenches and alignment jigs, can make the bedding process easier and more accurate. Ensuring that the bearing is aligned correctly is key to its long-term performance.
   
4. Store the Sealant Correctly – ThreeBond 1102 should be stored in a cool, dry place to maintain its effectiveness. Before use, make sure the product is within its shelf life and hasn’t been exposed to extreme conditions.
   

Benefits of Proper Swing Bearing Bedding
Properly bedding the swing bearing with ThreeBond 1102 can provide several long-term benefits:

• Extended Bearing Life – Proper bedding prevents premature wear caused by improper alignment or exposure to contaminants.
  
• Increased Machine Efficiency – A well-bedded swing bearing reduces friction and wear, leading to smoother operation and less energy loss.
  
• Enhanced Durability – The use of ThreeBond 1102 ensures that the bearing remains securely in place, even under extreme loads and vibrations.
  
• Reduced Maintenance Costs – A properly installed bearing requires fewer repairs and replacements, lowering overall maintenance costs for the equipment.
  

Conclusion
Using ThreeBond 1102 to bed the swing bearing on a Hitachi excavator is an effective way to ensure that the bearing stays securely in place while also providing a reliable seal against dirt, moisture, and contaminants. By following the proper procedure, you can enhance the durability and efficiency of your machine, reducing maintenance costs and improving performance. Always follow the recommended guidelines for both the sealant and the bearing to achieve the best results.