Step-by-Step Rear Shock Oil Change for DHX Performance

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When it comes to maintaining your Fox DHX Performance [paid link] rear shock, one of the most crucial tasks is regularly changing the oil. The oil inside your shock helps maintain proper damping performance and lubrication, ensuring your ride remains smooth and controlled. Over time, the oil inside the shock can degrade due to heat and usage, which can lead to reduced performance and a harsher ride. This guide will walk you through the detailed steps for changing the oil in your Fox DHX Performance [paid link] rear shock.

Tools Required

  • 8mm and 10mm Allen wrenches [paid link]
  • 5mm Allen wrench [paid link]
  • Torque wrench [paid link]
  • Suspension fluid (Fox Float Fluid or equivalent)
  • Suspension seal kit (specific to Fox DHX Performance)
  • Shock pump
  • Clean rag or towel
  • Oil drain pan
  • 2.5mm and 3mm Allen wrenches [paid link]
  • Fox suspension oil syringe (or a similar tool for accurate oil dispensing)
  • Small flathead screwdriver
  • Compressed air (optional for removing old oil)

Preparing for the Oil Change

Before you start the oil change process, it’s important to prepare the shock and your workspace properly to ensure a clean and efficient job.

Step 1: Remove the Rear Shock from the Bike

  1. Use an 8mm Allen wrench [paid link] to remove the bolts attaching the rear shock to the bike frame.
  2. Gently slide the shock out of the mount, making sure you don’t damage any seals or components during removal.
  3. Place the shock on a clean work surface to prevent contamination during the maintenance process.

Step 2: Clean the Shock

Use a clean rag or towel to wipe down the shock, focusing on the areas around the seals. This will help avoid any dirt or debris from entering the shock when you disassemble it. Make sure to clean both the body and the air sleeve, as well as any other components you plan to touch during the oil change.

Disassembling the Fox DHX Performance Shock

Step 3: Remove the Air Canister

  1. Use a 10mm Allen wrench to remove the top air canister bolt on the shock.
  2. Gently slide off the air canister from the shock body, taking care not to damage the internal components.
  3. Let the air canister fully decompress before setting it aside. This ensures that you avoid any potential pressure release during the next steps.

Step 4: Disassemble the Main Body

  1. Using a 5mm Allen wrench, remove the bottom shock mount bolt.
  2. With the mount removed, carefully slide the shock eyelet and lower mount away from the shock body.

Draining and Cleaning the Shock Internals

Step 5: Drain the Old Shock Oil

  1. Position the shock over an oil drain pan.
  2. Using a small flathead screwdriver, remove any retaining clips or seals around the shock oil port.
  3. Open the oil fill port and allow the old oil to drain completely. This can take several minutes, depending on the condition of the oil.
  4. If needed, use compressed air to help push out any residual oil from inside the shock.

Step 6: Clean the Internals

Once all the old oil is drained, take the time to clean the internal components. Use a clean towel or rag to wipe away any remaining dirt or grime. Be careful not to scratch the shock internals or damage any seals.

Refilling with Fresh Shock Oil

Step 7: Reassemble the Main Body

  1. Once the internals are clean, carefully reassemble the shock body by reversing the disassembly steps.
  2. Ensure that all seals are properly installed, and be sure to apply a small amount of suspension oil to the seals before reassembly to avoid dry seals during operation.

Step 8: Add Fresh Shock Oil

  1. Using a Fox suspension oil syringe, fill the shock body with fresh oil (Fox Float Fluid or the recommended oil for your model).
  2. Carefully pour the fluid into the shock body until it reaches the recommended oil volume specified in the Fox DHX Performance manual.
  3. Be precise with the amount of oil you use, as too much or too little can affect the shock’s performance.

Step 9: Replace the Oil Seals and Retaining Clips

After filling the shock with oil, replace any retaining clips and seals that were removed during disassembly. Make sure the seals are installed properly to prevent leaks. If needed, use suspension grease to lubricate the seals for a smoother fit and operation.

Reassembling the Shock and Final Adjustments

Step 10: Reattach the Air Canister

  1. Slide the air canister back onto the shock body.
  2. Tighten the top air canister bolt with a 10mm Allen wrench to the specified torque setting.
  3. Ensure the canister is seated correctly and that the seals are in place to avoid air leaks.

Step 11: Reattach the Lower Shock Mount

  1. Slide the lower shock mount back into place.
  2. Use a 5mm Allen wrench to tighten the bottom shock mount bolt to the recommended torque value.

Testing and Adjusting the Shock

Step 12: Reinstall the Shock on the Bike

  1. Position the shock back onto the bike frame, aligning the top mount with the frame.
  2. Use the 8mm Allen wrench to reattach the shock bolts securely.
  3. Double-check that the shock is mounted properly and that all bolts are torqued to the correct specifications.

Step 13: Add Air Pressure and Test

  1. Use a shock pump to add air to the shock, following the pressure recommendations in the Fox DHX Performance manual for your weight and riding style.
  2. Test the shock by compressing it by hand to ensure the oil is properly distributed and that the shock operates smoothly.
  3. If necessary, adjust the air pressure or damping settings to fine-tune the shock’s performance.

Troubleshooting Common Issues

If the shock feels too soft or too stiff after an oil change, check the air pressure and oil volume. If the shock is still not performing optimally, inspect the seals for damage or misalignment, and ensure that all components are properly lubricated. It may be necessary to repeat the oil change procedure if the shock continues to underperform.

Customization and Optimization Tips

To get the most out of your Fox DHX Performance shock, consider adjusting the rebound and compression settings to match your riding conditions. Fine-tuning these settings can help optimize your shock’s performance, providing a smoother and more controlled ride.

Conclusion

Performing a rear shock oil change on your Fox DHX Performance shock is a crucial part of maintaining the shock’s performance and extending its lifespan. By following the steps outlined in this guide, you can ensure that your shock remains in top working condition, offering smooth and controlled performance for your rides. Always be sure to use the correct oil and tools for the job, and take the time to carefully follow the assembly and disassembly steps to prevent damage to your shock.