Step-by-Step Rear Shock Oil Change for DB Kitsuma Trunnion

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The Cane Creek DB Kitsuma Trunnion [paid link] rear shock is a high-performance shock designed for aggressive riders who demand top-tier suspension performance. Like all suspension components, the DB Kitsuma Trunnion [paid link] requires regular maintenance to keep it functioning optimally. A key maintenance task is changing the oil, which ensures smooth operation and prolongs the life of the shock.

In this detailed guide, we’ll walk you through the entire process of changing the oil on your DB Kitsuma Trunnion rear shock, from gathering the necessary tools to troubleshooting common issues. Whether you’re a beginner or an experienced mechanic, this step-by-step guide will help you complete the job efficiently.

Tools Required

  • Cane Creek DB Kitsuma Trunnion Service Kit
  • Torque wrench [paid link] (specific to the shock hardware)
  • 2.5mm, 5mm, and 6mm hex keys [paid link]
  • 15mm spanner wrench
  • Shock pump
  • Small container or draining tray for oil
  • Plastic syringe (for oil transfer)
  • Oil (Cane Creek recommended suspension fluid)
  • Clean rags or paper towels
  • Rubber gloves

Preparing for the Oil Change

Before starting the oil change, ensure that your bike is securely mounted on a stand. This will provide stability and make the task much easier. It’s also a good idea to wear gloves to keep the shock and components free from contaminants.

Step 1: Remove the Rear Shock from the Frame

  1. Using the appropriate hex keys [paid link] (typically 5mm and 6mm), remove the bolts that secure the DB Kitsuma Trunnion rear shock to the bike frame.
  2. Carefully slide the shock off the frame. Keep track of the hardware and set it aside in a safe place.

Step 2: Clean the Shock Exterior

Once the shock is removed, it’s essential to clean the exterior before proceeding with the oil change. Use a clean rag or paper towel to wipe down any dirt or debris from the shock’s body, especially around the seals. This will prevent dirt from entering the shock when you open it.

Step 3: Set Up for Oil Drainage

Position the shock in a clean container or tray to catch any used oil that will drain out. This ensures that the oil change is tidy and helps avoid contaminating your work area. Additionally, ensure the shock is placed with the trunnion mount facing up for easier oil drainage.

Draining the Old Oil

Step 4: Remove the Air Canister and Open the Oil Reservoir

  1. Start by removing the air canister using a 15mm spanner wrench. This will expose the internal components of the shock.
  2. Once the air canister is removed, use the appropriate tools to unscrew and open the oil reservoir cap. Be prepared for some residual oil to drain out at this stage.

Step 5: Drain the Old Oil

After opening the reservoir, tilt the shock to allow all the old oil to drain completely into the container. Let it sit for several minutes to ensure that all the oil has drained from the shock. Dispose of the old oil properly according to local disposal regulations.

Reassembling the Shock

Step 6: Clean the Shock Internals

Before adding new oil, take the opportunity to inspect and clean the shock internals. Use a clean, lint-free cloth to wipe away any dirt or oil residue. Pay special attention to the piston and seals, as these components are critical to the shock’s performance.

Step 7: Add Fresh Oil

  1. Once the internals are cleaned, use a plastic syringe to transfer the recommended amount of suspension oil into the reservoir. Ensure that you are using the exact oil specified by Cane Creek for the DB Kitsuma Trunnion.
  2. Carefully fill the oil to the correct level, as specified in the service manual. Overfilling or underfilling can lead to performance issues, so accuracy is essential.

Step 8: Reassemble the Shock

  1. After adding the oil, carefully replace the oil reservoir cap and tighten it to the correct torque specification using a torque wrench [paid link].
  2. Reinstall the air canister, ensuring it is threaded properly and tightened securely.
  3. Once everything is back in place, double-check that all bolts and fasteners are properly tightened.

Finalizing the Installation

Step 9: Reinstall the Shock onto the Frame

  1. Now that the oil change is complete, it’s time to reinstall the shock onto your bike frame. Slide the shock back into position, aligning the trunnion mount with the corresponding frame mounts.
  2. Reinstall the bolts, tightening them to the proper torque specification using a torque wrench. This ensures that the shock is securely attached and will function correctly.

Step 10: Set Up the Air Pressure

Use a shock pump to set the appropriate air pressure in the shock. Refer to Cane Creek’s recommended pressure settings for your weight and riding style. Proper air pressure is crucial for maintaining optimal shock performance.

Step 11: Test the Shock

Once the shock is reinstalled, perform a few compressions to ensure everything is functioning smoothly. Check for any abnormal sounds, leaks, or stiffness. If you notice anything unusual, double-check the assembly to ensure the oil was filled properly and that the shock is fully reassembled.

Troubleshooting Common Issues

Leaking Oil

If you notice oil leaking from the shock after an oil change, it could be due to improper sealing or over-tightening of the reservoir cap. Make sure the cap is correctly aligned and tightened to the manufacturer’s torque specifications.

Poor Shock Performance After Oil Change

If the shock feels underperforming after the oil change, ensure that the air pressure is properly set. Incorrect oil levels or insufficient oil in the shock can also lead to poor performance. Review the oil level and recheck the installation.

Noisy Shock

If the shock is making unusual noises, such as knocking or creaking, this could be a sign of air trapped in the system. Bleed the air from the shock and ensure that the oil reservoir is properly sealed to eliminate air pockets.

Conclusion

Changing the oil in your Cane Creek DB Kitsuma Trunnion rear shock is an essential maintenance task to ensure the longevity and optimal performance of the shock. By following this step-by-step guide, you can confidently perform the oil change yourself, avoiding costly shop visits. Regular maintenance and proper oil changes are vital for keeping your rear shock in top condition, allowing you to enjoy a smooth and responsive ride on any terrain.