How to Service Your Arma V3 Rear Shock Without a Mechanic

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The Arma V3 [paid link] rear shock, developed by EXT, is known for its premium performance and precision. Designed to withstand rigorous riding conditions, it provides exceptional handling and comfort. However, like any high-performance component, it requires regular maintenance to keep it functioning at its best. While servicing a rear shock might seem complex, this guide will help you service the Arma V3 [paid link] rear shock on your own without the need for a professional mechanic. By following these detailed steps, you will be able to extend the life of your shock and ensure optimal performance.

Tools Required

  • 2mm, 5mm, and 6mm Allen wrenches [paid link]
  • Torque wrench [paid link] (capable of low settings)
  • Shock pump
  • Soft cloth or microfiber towel
  • Suspension fluid (specific to EXT shocks)
  • Teflon tape
  • Small flathead screwdriver
  • Grease
  • Clean container for drained fluid
  • Small brush (for cleaning)
  • Needle or syringe (for fluid transfer)

Preparing the Shock for Service

Before you begin the maintenance process, make sure the bike is securely supported, either on a bike stand [paid link] or by resting it upside down. This ensures that the shock is accessible and stable throughout the service.

Step 1: Remove the Shock from the Frame

To begin servicing your Arma V3 rear shock, you need to detach it from the frame. Use a 5mm Allen wrench [paid link] to unscrew the bolts at the shock mounting points. Carefully remove the shock from the frame, taking note of how it’s positioned for reinstallation.

Step 2: Clean the Shock Exterior

Once the shock is removed, use a soft cloth or microfiber towel to clean the exterior. Dirt and debris can cause damage during disassembly, so it’s important to wipe down the shock thoroughly. Be gentle around sensitive components like the air valve and rebound adjuster.

Disassembling the Arma V3 Rear Shock

Now that the shock is clean and removed from the frame, you can begin disassembling it to access internal components.

Step 3: Remove the Air Sleeve

The Arma V3 rear shock uses an air-sprung system, and the air sleeve needs to be removed to access the internal components. Using a 6mm Allen wrench [paid link], loosen and remove the bolts securing the air sleeve. Once the bolts are removed, gently slide the air sleeve off the shock body. Be cautious of any internal components that may be loose.

Step 4: Drain the Old Suspension Fluid

After removing the air sleeve, it’s time to drain the old suspension fluid. Hold the shock in a vertical position with the rebound adjuster pointing downward. Gently tap or rotate the shock to allow the fluid to drain into a clean container. Be sure to discard the old fluid properly and avoid contaminating any other parts.

Step 5: Clean the Internal Components

Using a small brush, clean the internal components of the shock, including the damper rod and seals. Pay close attention to any signs of wear or damage. You may need to replace worn seals or o-rings at this point to ensure proper functionality. Be careful not to dislodge or damage any of the internal parts.

Rebuilding the Arma V3 Rear Shock

Once the shock has been thoroughly cleaned, you can begin reassembling it with fresh components and suspension fluid.

Step 6: Apply Suspension Fluid

Before reassembling the shock, it’s essential to apply fresh suspension fluid. EXT recommends using a specific fluid for their shocks to ensure proper damping and performance. Using a needle or syringe, carefully fill the shock’s internal reservoir with the recommended amount of fluid. Be sure not to overfill, as this can affect the shock’s performance.

Step 7: Install New Seals and O-Rings

Next, replace any seals and o-rings that may show signs of wear. Apply a small amount of grease to the new seals to help them slide into place smoothly. Installing new seals ensures the shock is fully sealed and can perform without leaks or air loss.

Step 8: Reassemble the Shock

After replacing the seals, carefully slide the air sleeve back onto the shock body. Secure the air sleeve by tightening the bolts with the 6mm Allen wrench. Be sure not to overtighten the bolts, as this could cause damage to the shock body or air sleeve. Use a torque wrench [paid link] set to the manufacturer’s recommended torque setting.

Step 9: Reinstall the Shock on the Bike

Once the shock is fully reassembled, it’s time to reinstall it on the bike. Reattach the shock to the frame using the same bolts and positioning as before. Tighten the bolts securely, ensuring they are at the recommended torque settings.

Adjusting the Shock for Optimal Performance

After servicing and reinstalling the Arma V3 rear shock, it’s time to adjust it to your riding style and preferences.

Step 10: Set the Sag

To ensure the shock performs optimally, you’ll need to set the sag. This is the amount of compression the shock experiences under your body weight. Use a shock pump to adjust the air pressure to the recommended level. Test the sag by sitting on the bike and checking how much the shock compresses under your weight. Adjust the pressure until you achieve the correct sag according to your rider weight and the manufacturer’s guidelines.

Step 11: Fine-Tune Rebound and Compression Settings

The Arma V3 shock features adjusters for rebound and compression damping. Begin by setting the rebound to a neutral position, typically the middle setting. Then, adjust the compression damping to suit your riding style. If you prefer a more plush ride, decrease the compression. If you want a firmer ride, increase the compression.

Test ride the bike after each adjustment to ensure the shock is performing as desired. Fine-tuning may take a few rides, as you may need to tweak the settings to match your riding conditions.

Troubleshooting Common Set-Up Issues

Issue 1: Shock Bottoming Out

If the shock is bottoming out during aggressive riding, it could be due to too little air pressure or improper compression settings. Increase the air pressure slightly and adjust the compression damping for a firmer feel. Recheck the sag and fine-tune accordingly.

Issue 2: Lack of Rebound Control

If the shock rebounds too quickly or too slowly, the rebound adjuster may not be set correctly. Adjust the rebound damping to a setting that suits your riding style. If the issue persists, check the shock for any damage or leaks.

Issue 3: Fluid Leaks

If you notice fluid leaking from the shock, this is often a sign that the seals need to be replaced. Carefully inspect the seals and o-rings for damage. Replacing the seals with high-quality parts can prevent leaks and ensure long-term reliability.

Conclusion

By following these steps, you can effectively service your Arma V3 rear shock and keep it performing at its best. Regular maintenance, including cleaning, fluid replacement, and proper adjustments, will ensure that your shock continues to provide the ride quality and performance you expect. If you encounter any issues beyond your skill level, consulting with a professional mechanic is always a good option.