How to Rebuild Your Topaz MX Rear Shock at Home

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The DVO Topaz MX [paid link] rear shock is a high-performance component designed for mountain bike enthusiasts who demand precision and reliability. Whether you’ve experienced a decrease in performance or simply want to maintain your shock at peak [paid link] efficiency, rebuilding your Topaz MX [paid link] rear shock at home can be a satisfying and cost-effective solution. This guide will walk you through the entire process, from disassembly to reassembly, with all the necessary steps to ensure the shock functions optimally.

Tools Required

  • DVO Topaz MX service kit
  • 10mm and 13mm open-end wrenches
  • Torque wrench [paid link] (with proper range for shock components)
  • T15, T20, and T25 Torx drivers
  • 5mm Allen wrench [paid link]
  • Oil drain pan
  • Soft cloth or rag
  • Safety glasses
  • Latex gloves
  • Shock fluid (specific to the Topaz MX model)
  • Suspension grease
  • Isopropyl alcohol for cleaning

Preparation

Before starting the rebuild process, it’s important to prepare your workspace and gather all necessary tools. Make sure the bike is securely positioned, ideally in a bike stand [paid link], to allow easy access to the rear shock. If you’re working on the shock after extended use, ensure that the shock is fully de-pressurized before beginning. You can release pressure by using a shock pump to deflate the air spring.

Clean Your Shock

Before you start the disassembly, clean the exterior of the shock with a soft cloth to prevent dirt or debris from entering the shock internals during the rebuild process. This will also give you a clearer view of the shock’s components.

Disassembling the Topaz MX Rear Shock

Step 1: Remove the Shock from the Bike

  • Use a 5mm Allen wrench [paid link] to remove the bolts securing the shock to the frame. It’s important to keep track of the washers, spacers, and other small parts to ensure everything is reassembled correctly.
  • If the shock is connected to a linkage or other components, remove them using the appropriate tools (usually T15 or T20 Torx wrenches). Ensure that you do not damage any bushings or hardware.

Step 2: Drain the Oil and Gas

  • Place the shock in an oil drain pan to catch the fluid when it’s released.
  • Unscrew the air valve cap (using the correct size tool, often a T25 or T20 Torx) and allow the shock to deflate completely. You may need to depressurize the shock if it’s holding any remaining air. Carefully check that the shock is completely void of pressure.
  • Once depressurized, remove the oil fill cap and drain all the oil into the pan.

Step 3: Remove the Eyelets and Other Components

  • Use a 10mm or 13mm open-end wrench to remove the eyelet bolts that secure the shock’s lower and upper mounting points.
  • Inspect the mounting hardware for any signs of wear or damage, such as corrosion or deformation. These parts should be replaced if needed to ensure secure attachment to the bike frame during reassembly.

Servicing the Internal Components

Step 4: Remove the Shock’s Internal Parts

  • With the oil drained and the shock disassembled, the next step is to remove the internal components. Using a 5mm Allen wrench, carefully unscrew the fasteners that hold the shock’s damper assembly.
  • Gently pull the damper out of the shock body. Be cautious not to damage any seals, bushings, or other small components.
  • If the shock includes a bladder or internal air spring, remove it following the manufacturer’s instructions to avoid damaging delicate parts.

Step 5: Clean and Inspect the Components

  • Thoroughly clean the internal parts with isopropyl alcohol and a clean cloth to remove any old oil, dirt, or debris.
  • Inspect each component for wear and tear. Check for any scratches, dents, or abnormal signs of degradation. Pay special attention to the shock seals, as damaged seals can lead to air or fluid leaks.
  • If any components are found to be worn out, order replacements from DVO to ensure optimal performance.

Rebuilding and Reassembling the Topaz MX Rear Shock

Step 6: Reinstall the Internal Components

  • Begin by applying a thin layer of suspension grease to the shock’s internal components. This will help with smooth movement and prevent excessive wear over time.
  • Reinstall the bladder or air spring back into the shock body, ensuring it is seated correctly and fully secured.
  • Next, carefully reassemble the damper unit, making sure all components are aligned and the shock body is free of dirt or debris. Reattach any seals or o-rings that were removed during disassembly, ensuring a tight and proper fit to prevent leaks.

Step 7: Refill with Fresh Oil

  • Once the internal components are reassembled, it’s time to refill the shock with fresh oil. Use the shock fluid recommended by DVO for the Topaz MX model. Carefully pour the oil into the shock body, ensuring it reaches the required fill level.
  • After filling the oil chamber, reinstall the oil fill cap, making sure it is tightened to the manufacturer’s torque specification.

Step 8: Reinstall the Air Pressure

  • Use a shock pump to carefully reinflate the shock to the manufacturer’s recommended air pressure for your weight and riding style. Be sure to check the recommended pressure settings in the DVO Topaz MX user manual.
  • Perform a quick check for any air leaks by checking the Schrader valve and ensuring it’s securely seated.

Step 9: Reassemble the Shock

  • Once the oil and air pressure are restored, carefully reassemble the remaining components in reverse order of disassembly.
  • Reattach the shock eyelets, ensuring all washers and spacers are placed correctly. Tighten the bolts to the specified torque using a torque wrench [paid link].
  • Double-check all mounting hardware to ensure everything is secured and aligned properly.

Troubleshooting Common Setup Issues

Issue 1: Leaking Air Pressure

  • If your shock loses air pressure quickly after the rebuild, it could be due to a damaged Schrader valve or improper sealing during the reassembly process. Recheck the valve and seals, and replace any damaged parts.

Issue 2: Inconsistent Compression or Rebound

  • If you notice that your shock is not responding as expected, it may be an issue with the oil level or contamination in the damper. Recheck the oil fill and ensure all internal components are clean and properly assembled.

Issue 3: Unusual Noises During Use

  • Unusual noises, such as knocking or squeaking, may indicate that the shock’s mounting hardware is loose or that there is a lack of lubrication on the shock’s eyelets. Inspect all mounting points and reapply suspension grease where needed.

Final Adjustments and Performance Testing

After reassembling the shock, perform a full suspension setup on your bike. Adjust the compression and rebound settings to match your riding style, and check for any abnormalities during a test ride. This final testing phase is essential to ensure that your Topaz MX rear shock is performing at its best.

Customization for Improved Performance

For riders looking to fine-tune their suspension for specific riding conditions, consider adjusting the air pressure, rebound, and compression settings to suit different terrains. Riders who frequent technical descents may prefer a softer compression setting, while those who ride smoother trails may benefit from firmer settings. Always refer to the Topaz MX manual for recommended ranges for different settings.

By following these detailed steps, you’ll ensure that your Topaz MX rear shock performs optimally, giving you the smooth ride you expect on the trail.