Preventative Maintenance for DHX2 Trunnion Rear Shocks

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The Fox DHX2 Trunnion [paid link] rear shock is a high-performance shock used in a variety of mountain bikes designed for aggressive trail riding, enduro, and downhill racing. To ensure its optimal performance and longevity, preventative maintenance is crucial. Regular maintenance can help avoid costly repairs, improve the shock’s responsiveness, and maintain the overall performance of your bike.

Tools Required

Before you begin your maintenance routine, make sure you have the following tools:

  • Fox shock pump (for adjusting air pressure)
  • 3mm and 5mm hex wrenches
  • Torque wrench [paid link] (for precise installation and adjustment)
  • Isopropyl alcohol (for cleaning)
  • Rag or towel (for wiping down components)
  • Suspension grease
  • Replacement seals and o-rings (if needed)

Installation of the DHX2 Trunnion Rear Shock

Step 1: Remove the Existing Shock

  • First, remove your bike’s existing rear shock by loosening the bolts that attach it to the frame. Make sure to use the appropriate size hex wrench to prevent damaging the fasteners.
  • Carefully slide the shock out of the frame, keeping in mind the positioning of the shock mounts.

Step 2: Install the New DHX2 Trunnion Shock

  • Align the trunnion mount of the DHX2 shock with the corresponding holes in the frame.
  • Insert the shock into place, making sure the mounting hardware aligns correctly with the shock’s eyelets.
  • Secure the shock by tightening the bolts. Ensure that the bolts are torqued to the manufacturer’s recommended specification. Over-tightening or under-tightening can cause damage or improper functioning.

Step 3: Air Pressure Adjustment

  • Use a Fox shock pump to set the correct air pressure in the DHX2 Trunnion [paid link] shock. The ideal pressure depends on your weight, riding style, and bike setup. Refer to the owner’s manual for specific recommendations based on your weight and preferences.
  • Make incremental adjustments and check for proper sag before riding.

Step 4: Fine-Tune Rebound and Compression Damping

  • Adjust the rebound and compression settings according to your riding style and trail conditions. The DHX2 offers multiple adjustments to fine-tune both of these settings. Start by setting them to a neutral setting and adjust from there based on feedback during your rides.
  • Rebound controls how quickly the shock returns to its original position after compression. For downhill riders, a slower rebound is generally preferred, while faster rebound is suitable for smoother terrain.

Regular Maintenance of the DHX2 Trunnion Rear Shock

To keep your Fox DHX2 shock in top condition, regular cleaning and maintenance are necessary.

Cleaning the Shock

  • After each ride, clean the shock and its surrounding area with a rag and isopropyl alcohol to remove dirt and debris. This helps prevent dirt from entering the shock’s internal components, which can lead to wear and reduced performance.
  • Be sure to wipe down the air valve and damping adjusters to keep them functioning smoothly.

Checking for Leaks and Damage

  • Inspect the shock’s seals regularly for any signs of oil leaks. If oil is leaking from the shock, it could indicate a damaged seal, which may require replacement. Look for any signs of wear or damage on the shock body and mounts, as these can also affect performance.

Lubricating the Shock

  • Apply suspension grease to the shock’s mounting hardware during reinstallation or after any major cleaning. This helps maintain smooth movement and prevents the components from seizing up due to friction.

Inspecting the Mounting Hardware

  • Check the mounting bolts for tightness. Over time, these bolts may loosen due to vibrations. Ensure they are torqued to the manufacturer’s recommended specifications to avoid any frame or shock damage.
  • If you notice any wear on the hardware, replace it immediately.

Adjusting Air Pressure and Damping Settings

  • Regularly check and adjust the air pressure in the shock, particularly if you notice any change in performance or if you switch between different riders. Changes in weight or riding style can affect the required air pressure.
  • Adjust the rebound and compression settings based on ride feedback. If you feel that the shock is either too soft or too stiff, fine-tune these settings accordingly.

Troubleshooting Common Issues with the DHX2 Trunnion Rear Shock

Problem: Lack of Response or Softness in the Shock

  • Possible Cause: Low air pressure.
    • Solution: Check the air pressure and adjust it using a Fox shock pump to the recommended setting.

Problem: Rebound or Compression Damping Not Effective

  • Possible Cause: Incorrect damping settings.
    • Solution: Adjust the rebound and compression damping settings. Start with neutral settings and make incremental adjustments to find the optimal performance.

Problem: Leaking Oil

  • Possible Cause: Damaged seals.
    • Solution: Inspect the seals for any visible signs of wear. If damaged, replace the seals with compatible Fox DHX2 Trunnion shock seals.

Problem: Noisy Shock

  • Possible Cause: Lack of lubrication or dirt in the shock mount.
    • Solution: Clean the shock and reapply suspension grease to the mounting hardware. Ensure that the shock mount is free from dirt and debris.

Customization and Optimization for Better Performance

The Fox DHX2 Trunnion rear shock offers several options for customization to enhance performance. Riders can adjust both the compression and rebound settings to match their specific riding style and terrain.

Compression Damping

  • The compression damping controls how the shock resists compression during impacts. You can adjust the low-speed and high-speed compression settings for more precise control.
  • For aggressive riders tackling technical descents, increasing the compression damping can provide more support, reducing bottoming out. Conversely, reducing compression can offer more comfort on smoother trails.

Rebound Damping

  • The rebound damping controls how quickly the shock returns to its original position after compression. Adjusting this setting is crucial for maintaining control, especially on fast and rough terrain.
  • A slower rebound is ideal for downhill riding, as it provides more stability. On smoother trails, a faster rebound may offer a more responsive feel.

Air Pressure Adjustments

  • Adjusting the air pressure based on rider weight and terrain can provide the right amount of suspension support. For example, heavier riders or those riding more aggressive trails may require higher pressure, while lighter riders or those riding smoother terrain can benefit from lower pressure for better comfort and control.

Compatibility with Other Drivetrain Components

When setting up or replacing a DHX2 Trunnion shock, it’s essential to consider its compatibility with other components in your bike’s drivetrain. This includes ensuring that the shock’s specifications match your bike’s frame and suspension geometry. The DHX2 is designed for high-performance mountain bikes, and its mounting hardware should align with the bike’s rear triangle. Additionally, make sure that your other suspension components, such as the fork, are suitable for the same type of terrain and riding style to maintain consistent performance across your bike’s suspension system.