How to Rebuild Your DHX Performance Rear Shock at Home

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The Fox DHX Performance [paid link] rear shock is a popular choice for mountain bikers seeking superior performance, adjustable damping, and durability. Over time, like all suspension components, the DHX Performance [paid link] can begin to show signs of wear and may require maintenance. Rebuilding the shock at home is a practical and cost-effective solution that can restore its performance and extend its lifespan. This guide will walk you through the steps for rebuilding your DHX Performance rear shock, covering everything from disassembly to reassembly, along with tips for proper maintenance.

Tools Required

  • 10mm, 15mm, and 17mm wrenches
  • 8mm hex key
  • 3mm hex key
  • Torque wrench [paid link] (with appropriate settings)
  • Shock pump
  • Cleaning supplies (rags, degreaser)
  • Suspension oil (specific to Fox rear shocks)
  • O-ring pick
  • Soft mallet
  • Fox-specific rebuild kit
  • New seals (if necessary)
  • Grease (suspension-specific)
  • Replacement air can o-rings (if needed)

Disassembling the DHX Performance Rear Shock

Before you begin, make sure you have a clean and organized workspace. A clean environment will help you avoid contamination of parts during the disassembly process. You will also need to remove the shock from the bike frame.

1. Remove the Shock from the Bike

  • Use a 10mm and 15mm wrench to remove the bolts securing the shock to the frame.
  • Gently lift the shock from its mount, taking care not to damage any surrounding components.

2. Depressurize the Shock

  • Before disassembling, release all air pressure from the shock using a shock pump.
  • Make sure the shock is fully deflated to prevent any accidents during disassembly.

3. Remove the Air Canister

  • Using a 17mm wrench, loosen and remove the nut that secures the air canister to the shock body.
  • Carefully separate the air can from the shock body, ensuring not to damage any internal parts or seals.
  • You may need a soft mallet to gently tap the air can off if it’s stuck. Always use light taps to avoid damaging the shock.

4. Remove the Damping Assembly

  • Unscrew the top cap using a 3mm hex key to access the damping assembly inside the shock body.
  • Gently remove the damping assembly, noting its orientation and order of components for reassembly.

5. Inspect the Parts

  • Inspect the components for signs of wear, such as damaged seals or excessive oil buildup. Pay attention to the piston, damper shaft, and any internal components.
  • If you notice any worn-out parts, it’s best to replace them with new components from a Fox-specific rebuild kit.

Cleaning and Replacing Seals

The next step in the rebuild process is cleaning all the parts and replacing any seals that have been worn out.

1. Clean All Components

  • Use a rag and degreaser to clean all parts thoroughly. This includes the shock body, piston, air can, and damping assembly.
  • Avoid using harsh chemicals that may damage the seals or internal components. Be sure to remove any dirt or grime that may have accumulated.

2. Replace Seals and O-Rings

  • Inspect the seals and O-rings in the air can and damping assembly for signs of damage or wear.
  • Replace any damaged seals using the appropriate replacements from your Fox rebuild kit.
  • Make sure to grease the O-rings lightly with suspension-specific grease before reinstallation to ensure proper sealing.

Reassembling the DHX Performance Rear Shock

Now that all components are cleaned and the necessary seals are replaced, it’s time to reassemble the shock.

1. Reinstall the Damping Assembly

  • Carefully reinstall the damping assembly back into the shock body. Make sure it is aligned properly.
  • Tighten the top cap using the 3mm hex key. Be cautious not to overtighten, as this can damage the internal components.

2. Reinstall the Air Canister

  • Apply a small amount of grease to the air can’s sealing surface.
  • Carefully align the air can with the shock body and press it back into place.
  • Tighten the securing nut using the 17mm wrench, ensuring it is snug but not overtightened.

3. Check for Smooth Movement

  • Once the shock is reassembled, test the movement of the shock by pushing the air can and damping assembly up and down.
  • Ensure that there is no resistance or unusual feeling. If there is, disassemble and check for any misaligned components or missing seals.

Charging the Shock with Air Pressure

Once the shock is fully reassembled, it’s time to charge it with air. Follow these steps to achieve optimal performance.

1. Set the Proper Air Pressure

  • Use a shock pump to fill the air can with the recommended air pressure for your weight and riding style.
  • The recommended pressure varies depending on your riding conditions, so refer to the Fox DHX Performance manual for the proper range.

2. Fine-Tuning

  • After filling the shock with air, make small adjustments to the pressure to achieve the desired sag and responsiveness.
  • Test the shock on the bike, adjusting the pressure as needed until you achieve optimal performance for your riding conditions.

Troubleshooting Common Issues

Sometimes, issues can arise during or after the rebuild process. Here are a few common problems and how to address them.

1. Leaking Air

  • If you notice air leaking from the shock, inspect the air can and damping seals for proper installation.
  • Ensure that the O-rings are well-greased and seated correctly.

2. Poor Damping Performance

  • If the shock doesn’t provide smooth damping, it may be due to insufficient oil or dirty internals.
  • Recheck the oil level and replace any worn-out damping components. Ensure that all components are clean and lubricated before reassembling.

3. Unusual Noises

  • If you hear unusual noises from the shock, such as clunking or popping sounds, it could be due to misalignment during reassembly or issues with the damping assembly.
  • Double-check the assembly order and ensure all parts are properly aligned and tightened.

Final Thoughts on Rebuilding Your Fox DHX Performance Rear Shock

Rebuilding your Fox DHX Performance rear shock at home can save you both time and money while ensuring your bike performs at its best. By following these detailed steps for disassembly, cleaning, and reassembly, you can restore your shock to its optimal condition. Regular maintenance, such as rebuilding your shock after a season of riding, will help extend the life of your shock and improve your riding experience.

By understanding the key components of the DHX Performance rear shock and following the proper procedures for rebuilding, you can maintain peak [paid link] performance for years to come.