The Cane Creek DB Kitsuma Trunnion [paid link] rear shock is a highly regarded component, known for its high-performance capabilities in both trail and enduro riding. Rebuilding your shock at home is a cost-effective and rewarding task, but it requires precise attention to detail and the proper tools. This guide provides a step-by-step breakdown of how to rebuild the DB Kitsuma Trunnion [paid link] rear shock, ensuring its longevity and performance.

Tools Required

• Cane Creek DB Kitsuma Trunnion rebuild kit
• 5mm and 8mm hex wrenches
• 10mm socket wrench
• Torque wrench [paid link]
• Suspension fluid (specific to Cane Creek)
• Clean lint-free rags
• Small flathead screwdriver
• Snap-ring pliers
• Air pump for suspension tuning

Disassembly of the DB Kitsuma Trunnion Rear Shock

Before beginning the rebuild process, ensure the shock is removed from the bike and cleaned thoroughly to avoid contaminants entering the internal components.

1. Remove the shock from the bike: Use the 5mm hex wrench to remove the mounting bolts holding the shock in place. Carefully detach the shock from the frame.
2. Release the air pressure: Using the air valve, release any air pressure within the shock to ensure safety during disassembly.
3. Remove the trunnion mount: Use an 8mm hex wrench to unscrew the trunnion mount from the shock body. Keep these components in a safe place for later.
4. Take off the spring and damper body: Carefully unscrew the spring preload collar (if applicable) and slide the spring off. Then, using your 10mm socket wrench, remove the damper body from the shock.
5. Take apart the shock: Use snap-ring pliers to remove any retaining clips and disassemble the shock’s main components. This step includes removing the damper piston and any seals within the shock assembly.

Cleaning and Inspection

Once the shock is disassembled, you can begin the cleaning and inspection process.

1. Clean the shock body and damper: Use a lint-free rag to wipe down the shock body, damper, and other components. Ensure all dirt, oil, and debris are removed from the internal and external surfaces.
2. Inspect the seals: Carefully inspect all seals for signs of wear or damage. If any seals are compromised, replace them with new ones from the rebuild kit. Worn seals can lead to air or oil leakage, affecting performance.
3. Check the shock piston: Examine the piston for any cracks or signs of wear. If there is significant damage to the piston, it will need to be replaced.

Rebuilding the DB Kitsuma Trunnion Rear Shock

Rebuilding your shock involves reassembling the components with new seals and oil, ensuring smooth operation once the shock is back on the bike.

1. Lubricate the seals: Before installing new seals, apply a small amount of suspension oil to lubricate them. This helps to reduce friction and extends the life of the seals.
2. Reassemble the shock: Start by installing the new seals and O-rings. Use the snap-ring pliers to securely install any retaining clips. Follow the reverse order of disassembly, making sure all parts are properly aligned.
3. Reinstall the damper piston: Carefully slide the damper piston back into the shock body. Ensure that it moves freely within the shock. Tighten it according to the manufacturer’s specifications using a torque wrench [paid link].
4. Add the suspension oil: Pour the specified amount of suspension oil into the shock body. Make sure to fill the chamber to the recommended level, as insufficient oil can affect the shock’s damping performance.
5. Install the trunnion mount: Reattach the trunnion mount to the shock body, ensuring it is aligned properly. Tighten the bolts using a torque wrench to the specified settings.
6. Reattach the spring: Slide the spring back onto the shock and secure the preload collar. Adjust the preload to your desired setting, ensuring that it is tight and secure.

Recharging and Testing the Shock

With the shock now rebuilt, it’s time to recharge the air chamber and test its performance.

1. Set the air pressure: Use an air pump designed for suspension to add the recommended air pressure to the shock. This pressure depends on your rider weight, preferred sag, and the shock’s specifications.
2. Test the shock’s movement: Before reinstalling the shock onto your bike, test the rebound and compression by pushing and pulling on the shock shaft. Check for smooth movement and ensure the shock responds to adjustments correctly.
3. Fine-tune settings: Once installed on the bike, adjust the rebound and compression settings as needed. These adjustments will help optimize the shock’s performance for your riding style and terrain.

Common Issues and Troubleshooting

While rebuilding the DB Kitsuma Trunnion rear shock is a relatively straightforward process, some issues may arise. Here are a few common problems and their solutions:

• Shock not holding air pressure: This can be caused by a damaged seal or O-ring. Inspect the seals thoroughly and replace any worn or damaged components.
• Unresponsive damping: If the shock feels unresponsive or performs poorly, it may be due to insufficient oil or air pressure. Double-check the oil levels and ensure the correct air pressure is applied.
• Excessive rebound or compression: If the shock rebounds too quickly or slowly, adjust the rebound and compression settings. If the problem persists, it may indicate a more significant internal issue that requires professional servicing.

Conclusion

Rebuilding your Cane Creek DB Kitsuma Trunnion rear shock at home can be a rewarding and satisfying task. With the right tools, a clear understanding of the steps involved, and attention to detail, you can restore your shock to its optimal performance level. Always take the time to inspect and clean your shock thoroughly during the rebuild process, as this can prevent future issues and enhance your riding experience.