Step-by-Step Rear Shock Oil Change for Mara Pro Trunnion

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The Mara Pro Trunnion [paid link] rear shock by Manitou is a high-performance suspension component designed to deliver a smooth and controlled ride. To maintain its optimal performance and longevity, it’s essential to perform regular maintenance, including an oil change. This guide provides a detailed, step-by-step process for changing the oil in the Mara Pro Trunnion [paid link] rear shock, ensuring it operates at its best for your rides.

Tools Required

  • 5mm Allen wrench [paid link]
  • 8mm Allen wrench [paid link]
  • Torque wrench [paid link]
  • Oil drain pan or container
  • T30 Torx wrench [paid link]
  • 30mm socket wrench
  • Manitou suspension oil (specific type for Mara Pro [paid link] Trunnion)
  • Cleaning rags
  • Shock pump
  • Small container for draining oil
  • Clean gloves (optional but recommended)
  • O-ring pick tool
  • Grease for reassembly
  • Bicycle stand or workbench

Preparing the Rear Shock for Oil Change

Before starting the oil change, ensure that the bike is securely positioned, either on a bike stand [paid link] or a workbench. Make sure the rear shock is removed from the bike to prevent any damage during the oil change process.

Step 1: Remove the Rear Shock from the Bike

  • Use the 5mm Allen wrench to loosen the bolts securing the shock to the frame.
  • Carefully remove the shock from the bike, ensuring you do not damage any surrounding components.

Step 2: Secure the Shock in a Stable Position

  • Once removed, position the rear shock on a stable surface, ensuring it won’t roll or get damaged during the oil change. Using a workbench or bike stand [paid link] is ideal for this purpose.

Draining the Old Oil

Now that the rear shock is removed and securely positioned, it’s time to drain the old oil.

Step 3: Remove the Air Canister

  • Use the 8mm Allen wrench to remove the air canister from the rear shock. This step is necessary to access the internal oil chamber.
  • Place the shock in a position where the air canister can be removed without spilling any oil.

Step 4: Drain the Old Oil

  • Once the air canister is removed, the internal oil reservoir will be exposed.
  • Place the shock over a container or oil drain pan to collect the old oil.
  • Slowly and carefully pour or allow the oil to drain out completely. Make sure to drain both the damping side and the air side.

Step 5: Clean the Components

  • While the oil is draining, clean any dirt or debris from the shock body using a rag. Be sure to avoid contaminating the shock components.
  • Use a soft brush to remove any dirt from the shock’s seals and body.

Replacing the Oil

With the old oil drained and the shock cleaned, it’s time to refill the shock with fresh oil.

Step 6: Prepare the New Oil

  • Refer to the manufacturer’s specifications for the type and amount of oil needed for the Mara Pro [paid link] Trunnion. It’s essential to use the specific oil recommended by Manitou to ensure the shock functions correctly.

Step 7: Fill the Oil Reservoir

  • Using a syringe or oil bottle, begin filling the shock’s oil reservoir with the fresh suspension oil.
  • Fill the oil until it reaches the correct level as per the Mara Pro Trunnion’s manual. Be sure not to overfill.

Step 8: Reassemble the Shock

  • Once the oil is filled, reattach the air canister carefully, ensuring it is sealed correctly.
  • Tighten the bolts to the manufacturer’s recommended torque settings using a torque wrench [paid link] to avoid damaging the shock or under-tightening the bolts.

Testing and Final Adjustments

After the oil change and reassembly, the shock needs to be tested to ensure everything is working properly.

Step 9: Reinstall the Rear Shock on the Bike

  • Reinstall the Mara Pro Trunnion rear shock onto the bike using the 5mm Allen wrench to secure the bolts.
  • Make sure the shock is firmly in place and aligned with the frame.

Step 10: Set the Air Pressure

  • Use a shock pump to add the correct air pressure to the shock. Refer to the manufacturer’s specifications for the recommended pressure based on rider weight and riding style.

Step 11: Test the Shock’s Performance

  • Once the shock is mounted and the air pressure is set, test the suspension by compressing it manually and checking for smooth movement.
  • Ensure there are no leaks around the air canister and that the shock rebounds properly.

Troubleshooting Common Issues

While performing an oil change on the Mara Pro Trunnion, you may encounter some common issues. Here are a few troubleshooting tips to help resolve these:

  • Shock not holding air: This could indicate an issue with the seals. Inspect the seals during disassembly and replace any worn or damaged seals before reassembling the shock.
  • Oil leakage: If oil leaks from the shock body or air canister, it may mean that the seals were not properly installed or tightened. Check for leaks after reassembly and address any issues with seal placement.
  • Unresponsive damping: If the damping is unresponsive after the oil change, it may be due to incorrect oil levels or air pressure. Double-check the oil volume and pressure settings to ensure they match the specifications.

Customization and Optimization for Better Performance

To optimize the Mara Pro Trunnion rear shock for your riding style, consider the following customization options:

  • Adjust Air Pressure: Tuning the air pressure to suit your weight and riding conditions is key to achieving the best ride feel. Lower pressure can provide more comfort on rough terrain, while higher pressure is ideal for aggressive riding.
  • Tuning the Damping: If the shock includes adjustable compression and rebound damping, fine-tune these settings based on your ride preferences. Compression damping affects how the shock reacts to bumps, while rebound damping controls how quickly the shock returns after compressing.

Compatibility with Other Drivetrain Components

The Mara Pro Trunnion is compatible with most modern drivetrain systems, but it’s important to check compatibility with your specific setup. Ensure that the shock’s dimensions (e.g., stroke length and eye-to-eye length) are compatible with your bike’s frame. Consult the manufacturer’s specifications for compatibility details before making adjustments or upgrades to your suspension system.

Conclusion

Performing a rear shock oil change on your Mara Pro Trunnion is an essential maintenance task to ensure smooth performance and extend the lifespan of your suspension. By following this step-by-step guide, you can easily change the oil, troubleshoot common issues, and customize your shock for optimal performance. Regular maintenance will not only improve your riding experience but also protect your investment in this high-quality suspension component.