Servicing your Mara Pro Trunnion [paid link] Rear Shock can seem like a daunting task, but with the right tools and knowledge, it’s completely possible to do it yourself. This guide will walk you through the steps necessary to maintain, adjust, and troubleshoot your rear shock to ensure it performs optimally.
Tools Required
- Manitou Mara Pro Trunnion [paid link] Rear Shock
- Shock pump
- 8mm and 10mm wrenches
- Torque wrench [paid link]
- Allen key set (for adjusting suspension components)
- Snap ring pliers
- Replacement seals and oils (specific to the Mara Pro [paid link] Trunnion)
- Bench or sturdy work surface
- Soft cloth
- Cleaning brush
- Rags
- Suspension oil (Manitou’s recommended type)
- Compression adjuster tool
- Latex gloves (optional, to keep parts clean)
- Rubber mallet (if necessary for stubborn parts)
Understanding the Mara Pro Trunnion Rear Shock
The Mara Pro [paid link] Trunnion is a high-performance rear shock designed for aggressive mountain biking. With its trunnion mount, it is specifically optimized for certain bike frames that require a different attachment style compared to standard eyelet designs. It provides adjustable rebound and compression, making it a versatile [paid link] choice for various riding styles.
Maintaining this shock is essential for preserving its performance and ensuring your bike handles well over time. Regular servicing can prevent potential issues, improve suspension efficiency, and extend the life of the shock.
How to Disassemble and Service the Mara Pro Trunnion Rear Shock
Step 1: Prepare Your Workspace
Ensure that you have a clean, dry workspace to begin the disassembly process. Lay down a soft cloth to protect your shock and prevent any damage to the internal components. It’s also helpful to have a designated area to organize the parts you remove during disassembly.
Step 2: Remove the Shock from the Bike
Before you start working on your Mara Pro Trunnion, carefully remove the shock from your bike frame. To do this:
- Use an 8mm or 10mm wrench to remove the bolts that secure the shock to the frame.
- Use a torque wrench [paid link] to avoid over-tightening or damaging the bolts when reinstalling the shock after servicing.
- Keep the bolts in a safe place to avoid losing them.
Step 3: Release Air Pressure and Remove the Shock’s Air Canister
Using a shock pump, release all air pressure from the shock. This is crucial as working on a pressurized shock could lead to injury or damage. After the air has been released, carefully remove the air canister.
Step 4: Remove the Snap Ring and Separate the Components
Use snap ring pliers to remove the snap ring that holds the air canister in place. Gently remove the air canister, being careful not to damage the seals.
At this point, you’ll be able to access the internal components, such as the damper and the spring assembly. Keep track of the parts you remove and how they are oriented so you can reassemble everything in the correct order later.
Step 5: Clean All Components
Using a soft cloth and a cleaning brush, thoroughly clean all parts of the shock. Focus on areas where dirt and grime may have built up, such as around the seals and on the shaft. Be cautious not to damage any delicate components while cleaning.
Replacing Seals and Oil
Step 6: Replace the Seals
Once the components are clean, check the seals for wear. If you notice any damage or cracks in the seals, replace them. Proper sealing is critical for preventing oil leaks and maintaining performance.
To replace the seals:
- Carefully remove the old seals.
- Install the new seals, ensuring they are seated properly. Pay attention to their orientation and placement within the shock body to avoid installation errors.
Step 7: Replace the Suspension Oil
After replacing the seals, it’s time to refill the shock with new suspension oil. The Mara Pro Trunnion uses a specific type of oil recommended by Manitou for optimal performance. Follow the manufacturer’s guidelines for the appropriate amount and type of oil to use.
To refill the oil:
- Add the recommended suspension oil to the damper and air chamber.
- Slowly compress the shock to allow the oil to settle and fill the internal cavities.
- Add additional oil if necessary, ensuring the shock is adequately lubricated.
Step 8: Reassemble the Shock
Once the seals and oil are replaced, reassemble the shock by reversing the disassembly process. Be sure to:
- Carefully slide the air canister back onto the shock body.
- Reinstall the snap ring to secure the air canister in place.
- Reattach the shock to the frame, using a torque wrench to tighten the bolts to the recommended specifications.
Step 9: Set the Air Pressure
After reassembling your shock, it’s time to add air pressure. Use a shock pump to adjust the air pressure according to your rider weight and preferred riding style. Manitou provides a recommended pressure chart for various rider weights, which you should use as a baseline. Adjust the pressure until the shock feels responsive and comfortable.
Step 10: Test the Shock
Once the shock is reinstalled and the air pressure is set, perform a basic test by pushing down on the rear of your bike. The shock should compress and rebound smoothly. If you notice any stiffness or irregular movement, consider adjusting the compression or rebound settings. If problems persist, you may need to revisit the oil levels or seals.
Troubleshooting Common Set-Up Issues
Even after proper servicing, your Mara Pro Trunnion Rear Shock might encounter some issues. Here are some common problems and troubleshooting tips:
Insufficient Rebound or Compression Adjustment
If the rebound or compression isn’t adjusting correctly, it may be due to insufficient oil or improperly adjusted internal components. Try disassembling the shock and checking the oil levels and seals again. If the problem persists, inspect the damping mechanism for any signs of damage.
No Air Pressure Holding
If the shock loses air quickly, it could be a sign of a damaged seal or an issue with the air canister. Inspect all seals thoroughly and replace any damaged components. You may also need to replace the valve core if it’s leaking air.
Unresponsive Shock
If the shock feels unresponsive or overly stiff, check the air pressure and oil levels. Too much or too little oil can negatively affect the performance. Additionally, verify that the rebound and compression settings are within the recommended range.
Customization and Optimization for Better Performance
To further optimize your Mara Pro Trunnion Rear Shock for better performance, consider experimenting with the following adjustments:
- Compression Settings: Adjust the compression to suit your riding style. A firmer compression is ideal for more aggressive riding, while a softer compression setting can improve comfort for cross-country or endurance riding.
- Rebound Settings: Ensure the rebound is set correctly to allow for smooth, controlled movement. Too fast or too slow rebound can lead to uncomfortable riding and reduced control.
- Air Pressure: Fine-tune the air pressure based on the trail conditions. A lower pressure is more suited for technical trails with lots of bumps, while higher pressure works better for smoother, more stable rides.
Conclusion
Servicing your Manitou Mara Pro Trunnion Rear Shock without a mechanic is entirely achievable with the right tools and knowledge. By following the steps outlined in this guide, you can maintain and optimize your shock to keep your bike performing at its best. Regular servicing ensures that your shock remains responsive, comfortable, and durable for many rides to come. Always refer to the manufacturer’s guidelines for specific recommendations and make adjustments based on your personal riding preferences.