How to Rebuild Your DHX2 Factory Rear Shock at Home

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The Fox DHX2 Factory Rear Shock is known for its high performance, delivering exceptional damping control for downhill and aggressive trail riding. Over time, your rear shock may begin to lose its performance due to wear and tear. Rebuilding the DHX2 Factory rear shock at home is an excellent way to restore its performance, save money, and gain a deeper understanding of your bike’s suspension system.

This detailed guide will walk you through the process of rebuilding the DHX2 Factory Rear Shock, including installation, adjustment, maintenance, troubleshooting, and tips on optimization.

Tools Required

Before you begin the rebuild, ensure you have the following tools:

  • Fox Shock Pump (for pressure adjustments)
  • 8mm, 10mm, and 15mm wrenches
  • Torque wrench [paid link] (0-60Nm range)
  • Suspension fluid (Fox recommended)
  • 3mm, 4mm, 5mm, and 6mm Allen wrenches [paid link]
  • Compression tool for removing the shock spring
  • Silicone grease
  • A clean workspace with proper lighting
  • A soft, clean cloth for wiping down parts
  • Fox Racing Shox Rear Shock Rebuild Kit (for seals and O-rings)
  • Fox DHX2 Factory Owner’s Manual (for reference)

Preparation for Rebuilding

Before beginning any work on your DHX2 Factory Rear Shock, make sure that your shock is removed from the bike and completely clean. This ensures that no dirt or debris enters the shock during the rebuild process.

  • Carefully remove the shock from the bike using appropriate tools to disconnect it from the frame and linkage.
  • Clean the shock with a soft cloth to remove any visible dirt or grime.
  • Place the shock on a stable surface, ensuring it’s well-supported throughout the rebuild process.

Disassembling the Shock

Step 1: Remove the Shock Eyelet Bolt and Spring

Start by removing the shock’s eyelet bolts from the top and bottom of the shock. Use a 10mm wrench to loosen the bolts. Make sure to place these bolts in a safe area to prevent losing them.

  • Loosen the spring preload adjuster, if applicable.
  • Use a compression tool to safely remove the shock spring from the shock body.

Step 2: Detach the Shock Damper Cartridge

With the spring removed, locate the damper cartridge assembly. Using the appropriate size Allen wrench [paid link], unscrew the damper retainer from the shock body. Gently pull the damper cartridge out, ensuring you do not damage the seals.

  • Make sure to note the position of any washers, O-rings, and seals for reassembly.
  • Carefully remove the damper shaft from the cartridge to inspect its condition. If necessary, replace any worn-out seals.

Step 3: Remove the Air Sleeve

Next, you will need to remove the air sleeve. This component houses the air pressure chamber, which requires maintenance periodically. Use your 8mm Allen wrench [paid link] to unscrew the air sleeve from the shock body.

  • Carefully slide the air sleeve off to expose the internal parts.
  • Clean the air sleeve and the shock body to remove any contaminants.

Cleaning and Inspection

Once disassembled, it’s time to thoroughly clean each component. Use suspension fluid to clean the internal parts and remove any old oil, dirt, or debris.

Step 1: Inspect Seals and O-Rings

Examine the seals, O-rings, and any other rubber components for signs of wear or damage. If any of these components are cracked, hard, or no longer pliable, replace them with new parts from the Fox DHX2 Factory Rebuild Kit.

Step 2: Check for Internal Damage

Check the shock’s internals, such as the damper shaft and piston. Ensure they are free from any noticeable damage, cracks, or excessive wear. If the damper or shock body shows significant damage, it may need professional servicing.

Rebuilding the Shock

Step 1: Reassemble the Damper Cartridge

Start by placing the damper cartridge back into the shock body. Apply a thin layer of suspension fluid to the damper’s O-rings to ensure smooth operation. Carefully thread the retainer back into the shock body, tightening it to the manufacturer’s recommended torque specification (refer to the Fox DHX2 Factory Owner’s Manual for the correct value).

  • Ensure the damper cartridge is properly seated and free from any obstruction.

Step 2: Reinstall the Air Sleeve

Before reassembling the air sleeve, apply a small amount of suspension fluid to the O-rings and seals inside the sleeve. This will help to ensure a smooth seal and prevent air leakage.

  • Carefully slide the air sleeve back onto the shock body, ensuring that the internal components align correctly.
  • Tighten the air sleeve securely to prevent any leakage during use.

Step 3: Install the Shock Spring

Reinstall the shock spring onto the shock body. Ensure the spring is properly aligned and seated into its designated groove. Use the spring compression tool to carefully compress the spring and reinstall it onto the shock.

  • Tighten the preload adjuster and check that the spring is firmly secured.

Adjustment and Tuning

Once the shock is fully rebuilt, it’s time to make necessary adjustments to suit your riding style and preferences.

  • Set the sag according to your weight by adjusting the air pressure with a shock pump. Refer to the Fox DHX2 Factory manual for recommended pressure settings based on your weight and riding style.
  • Adjust the compression and rebound settings to match your riding conditions. These controls will help optimize your shock’s performance for smooth, controlled descents or technical trails.

Troubleshooting Common Set-Up Issues

Shock Not Holding Air

If the shock is not holding air, check for possible leaks in the air sleeve seals or the damper’s O-rings. Inspect the Schrader valve and the valve core for proper seating. Rebuilding or replacing the seals may be required to restore proper functionality.

Reduced Performance After Rebuild

If the shock’s performance has degraded after rebuilding, ensure that the damper cartridge and air sleeve were properly reinstalled. Check for any missing seals, damaged components, or improper tuning settings.

Customization and Optimization

The Fox DHX2 Factory Rear Shock is designed for fine-tuned customization. To maximize its performance, consider the following options:

  • Volume Spacers: Adding or removing volume spacers can help adjust the shock’s progression. If you’re bottoming out too often, adding spacers will increase resistance as the shock compresses. Alternatively, removing spacers can provide a more linear feel if you’re seeking more responsive suspension.
  • Tuning Rebound and Compression: By adjusting the low-speed compression, you can tailor the shock to your specific riding terrain, such as downhill, aggressive trail riding, or cross-country. Rebound settings should be adjusted based on how quickly you want the shock to return after compression.

Compatibility with Other Drivetrain Components

The DHX2 Factory Rear Shock is designed to work seamlessly with a wide range of high-end mountain bike components. It’s particularly compatible with Fox forks and shocks, but it can also pair well with other premium suspension systems from brands like RockShox. Make sure to check the specifications for mounting hardware compatibility to ensure optimal fitment and performance with your bike’s frame and linkage.

Conclusion

Rebuilding your Fox DHX2 Factory Rear Shock at home is a great way to maintain its peak performance and extend its lifespan. By following this step-by-step guide, you can ensure that your shock functions like new, giving you the confidence to tackle the toughest trails. Regular maintenance, proper tuning, and timely repairs will keep your rear shock operating smoothly for years to come.