Step-by-Step Rear Shock Oil Change for TTX22M Trunnion

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The Öhlins TTX22M Trunnion [paid link] rear shock is a high-performance suspension component designed for riders who demand precision and reliability. Over time, the oil inside the shock can degrade, which can affect performance. Regular oil changes are crucial to maintaining optimal function, smooth operation, and prolonged lifespan of the shock. This guide provides a detailed, step-by-step approach to changing the oil in the TTX22M Trunnion [paid link] rear shock.

Tools Required

  • Öhlins TTX22M oil change kit
  • 3mm, 5mm, and 8mm hex wrenches
  • Torque wrench [paid link] (up to 25 Nm)
  • Small flathead screwdriver
  • 10mm open-end wrench
  • Oil drain pan
  • Latex gloves
  • Isopropyl alcohol
  • Cleaning rags
  • Fresh Öhlins shock oil (specific to the TTX22M model)
  • Grease (Öhlins recommended type)
  • Sealant (Öhlins recommended type)
  • Oil syringe
  • 1-liter measuring jug

Preparation

Before starting the oil change, ensure the bike is secure and stable. It’s best to remove the rear shock from the bike to perform the oil change. This ensures better access and reduces the risk of contaminating other components. Make sure to have a clean workspace to prevent contaminants from entering the shock during the process.

Step 1: Remove the Rear Shock

  1. Use a 5mm hex wrench to remove the bolts securing the shock to the frame. Keep these bolts in a safe place as they will be reused.
  2. Gently remove the shock from the bike, making sure not to damage the shock body or any mounting hardware. You may need to use a 10mm open-end wrench to remove the mounting hardware depending on the frame setup.

Step 2: Clean the Shock

Before performing any work on the shock, it’s important to clean it thoroughly:

  1. Wipe down the shock with a rag to remove any dirt, grease, or oil on the exterior.
  2. Use isopropyl alcohol and a clean cloth to clean the shock’s exterior thoroughly. This helps to prevent contamination of the oil during the refill process.

Step 3: Disassemble the Shock

  1. Remove the compression knob and rebound knob using a small flathead screwdriver, taking care not to scratch or damage the knobs.
  2. Use an 8mm hex wrench to unscrew the air canister from the shock body. Be sure to have a drain pan ready to collect any oil that will spill during this process.
  3. Once the air canister is removed, inspect the internal components for any damage or wear. Clean the components as necessary.

Step 4: Drain Old Oil

  1. With the shock positioned vertically, use the oil syringe to extract the old oil from the shock body. Ensure that you remove as much old oil as possible to avoid contamination when refilling.
  2. Allow the shock to drain for several minutes to ensure no residual oil remains inside. Dispose of the old oil in an environmentally friendly manner.

Step 5: Clean the Internals

  1. Use isopropyl alcohol and a clean rag to wipe down the internal components. Ensure that no dirt, dust, or oil residue remains.
  2. Inspect the internal parts, including seals and o-rings, for any signs of wear. Replace any damaged components before proceeding.

Step 6: Reassemble the Shock

  1. Once the shock body is thoroughly cleaned, it’s time to begin reassembly. Begin by reinstalling the air canister onto the shock body. Use the 8mm hex wrench to tighten the canister, ensuring a firm, leak-free seal. Tighten to the recommended torque specifications (typically around 25 Nm).
  2. Reinstall the compression and rebound knobs, making sure they are seated correctly and operate smoothly.

Step 7: Fill with Fresh Oil

  1. Using the oil syringe, fill the shock with the recommended amount of fresh Öhlins shock oil. For the TTX22M, make sure to use the correct viscosity and type of oil specified in the service manual.
  2. Slowly pour the oil into the shock body, ensuring the oil is evenly distributed throughout the internals. Check the oil level as you fill to avoid overfilling.
  3. After filling, pressurize the shock by cycling the shock through its full range of motion a few times. This helps to evenly distribute the oil and remove any air bubbles from the system.

Step 8: Reinstall the Shock

  1. With the oil properly filled and the shock reassembled, reinstall the shock onto the bike’s frame.
  2. Use the 5mm hex wrench to secure the shock in place, tightening the bolts to the recommended torque specification.
  3. Double-check the shock for any signs of leakage or movement. If the shock is not seated properly, readjust the bolts.

Step 9: Test the Shock

Once the shock is back on the bike, it’s crucial to test it before heading out on a ride. Perform the following checks:

  1. Recheck the rebound and compression settings to ensure they are functioning correctly.
  2. Take a short test ride to check for any abnormal sounds or issues with the shock.
  3. If the shock feels overly stiff or too soft, adjust the air pressure or oil levels accordingly.

Troubleshooting Common Set-Up Issues

  • Leaks: If you notice oil leakage from the shock, it may indicate improper sealing during reassembly. Check the seals and o-rings, and ensure they are properly seated.
  • Unresponsive Damping: If the rebound or compression damping is unresponsive or inconsistent, it could be due to incorrect oil filling or air trapped inside the shock. Try cycling the shock again and ensure the oil is distributed properly.
  • Excessive Stiffness: If the shock feels too stiff after the oil change, you may have overfilled it with oil. Recheck the oil level and adjust as necessary.

Customization and Optimization for Better Performance

  • Adjusting Rebound and Compression: The TTX22M Trunnion allows for detailed adjustments to both rebound and compression damping. Experiment with different settings to tailor the shock’s performance to your riding style and terrain.
  • Air Pressure: Adjusting the air pressure in the shock can also affect its performance. Ensure that you are running the correct air pressure for your weight and riding conditions.
  • Fresh Oil Regularly: Changing the shock oil at regular intervals, based on usage, will help keep your shock functioning at its peak [paid link] and prevent any performance degradation over time.

Conclusion

Performing a rear shock oil change on the Öhlins TTX22M Trunnion requires patience, attention to detail, and the right tools. By following this guide, you can ensure that your rear shock is properly maintained, offering improved performance and longevity. Regular maintenance will keep your ride smooth and responsive, allowing you to focus on the trails rather than worrying about shock issues.