DIY Suspension Fork Oil Change for Bluto RCT3

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Suspension forks play a crucial role in providing a smooth and controlled ride on rough terrains. The RockShox Bluto RCT3 is a popular choice among fat bike enthusiasts due to its high-performance capabilities and adjustability. Over time, the fork’s oil can break down, leading to a decrease in performance. Changing the oil is essential for maintaining optimal performance and extending the life of your fork. This guide will walk you through the process of performing a DIY suspension fork oil change on the RockShox Bluto RCT3.

Tools Required

  • RockShox 15mm axle tool
  • 8mm Allen wrench [paid link]
  • T10 Torx wrench [paid link]
  • 10mm socket wrench
  • 2.5mm Allen wrench [paid link]
  • Suspension fork oil (appropriate weight for your riding style)
  • Cleaning rags
  • Large container for draining oil
  • Fork seal grease
  • Small brush or soft cloth for cleaning
  • Replacement oil seals (if necessary)

Preparing for the Oil Change

Before starting the oil change process, ensure you have a clean and well-lit workspace. Perform the following steps to prepare your Bluto RCT3 fork for servicing:

  1. Remove the Front Wheel: Begin by removing the front wheel of the bike. This allows easier access to the suspension fork.
  2. Remove the Fork from the Bike: Use an 8mm Allen wrench to detach the fork from the bike frame by loosening the headset bolt.
  3. Position the Fork: Once the fork is removed, place it in a secure position with the legs pointing downwards, ensuring any remaining oil drains out completely.

Disassembling the Bluto RCT3 Fork

Now that the fork is in position, it’s time to disassemble it to access the oil.

  1. Remove the Air Cap: Use a 2.5mm Allen wrench to remove the air valve cap. Set it aside for later use.
  2. Unscrew the Damper Assembly: Using a T10 Torx wrench [paid link], remove the damper assembly from the right leg of the fork. Make sure to do this slowly to prevent damaging any internal parts.
  3. Take Out the Lower Leg: With the damper removed, the next step is to remove the lower leg assembly. Use your 15mm axle tool to remove the lowers. Hold the fork securely as you gently pull off the lower leg assembly, ensuring that any residual oil flows into your container.
  4. Inspect Internal Parts: Once the lower leg is removed, inspect the oil seals for damage. If the seals appear worn or torn, it is recommended to replace them to avoid leaks.

Draining and Cleaning the Fork

  1. Drain the Oil: With the lower leg removed, allow the oil to drain completely into your container. Make sure to give it time to drain fully to avoid mixing old oil with the new.
  2. Clean the Internal Components: Use a cleaning rag or soft brush to wipe down the internal components of the fork. Focus on the stanchions and any other exposed parts to ensure all old oil and dirt are removed.
  3. Clean the Lower Leg: Clean the inside of the lower leg with a soft cloth or brush, ensuring it is free of any debris or old oil.

Refilling the Fork with Oil

  1. Apply Fork Seal Grease: Before installing the new oil, apply a light layer of fork seal grease to the inner lip of the lower leg. This will help create a smooth seal and prevent any leaks.
  2. Add New Suspension Oil: Refer to the RockShox manual for the recommended oil volume and weight for the Bluto RCT3. Generally, the fork requires around 130-140ml of suspension oil per leg. Pour the new oil into the lower leg, being careful not to overfill.
  3. Reassemble the Fork: Once the new oil is in place, carefully reattach the lower leg to the fork. Tighten it securely using your 15mm axle tool, making sure there is no gap between the lower leg and the main fork body.
  4. Reinstall the Damper Assembly: Insert the damper assembly back into the right leg of the fork. Tighten it with a T10 Torx wrench to the manufacturer’s torque specifications.
  5. Reattach the Air Cap: Use your 2.5mm Allen wrench to replace the air valve cap.

Final Steps

  1. Check for Leaks: Before reinstalling the fork onto the bike, check for any leaks around the seals and damper. If you notice any issues, it may be necessary to disassemble and recheck the oil level or seals.
  2. Reinstall the Fork onto the Bike: Place the fork back into the bike frame, securing it with the headset bolt using your 8mm Allen wrench. Reinstall the front wheel, ensuring everything is tightly secured.

Troubleshooting Common Issues

  • Fork Feels Too Soft or Too Stiff After Oil Change: If you notice that the fork feels too soft or stiff, it may be due to the wrong oil weight or incorrect air pressure. Double-check the oil weight and ensure the recommended air pressure is set for your riding style.
  • Leaking Oil Around the Seals: If you observe oil leakage, it may indicate damaged seals. Replace any worn seals to prevent further leakage.
  • Fork Making Unusual Noises: Unusual noises such as clicking or popping can be caused by air bubbles trapped in the oil or misalignment of the damper assembly. Try bleeding the damper and checking for any loose components.

Conclusion

Performing an oil change on your RockShox Bluto RCT3 fork is essential for maintaining optimal performance. By following these steps carefully, you can ensure that your suspension fork is well-maintained and ready for your next adventure. Regular oil changes, proper maintenance, and attention to detail can significantly extend the life of your fork and enhance your riding experience.