DIY Maintenance Guide for Your Mara Pro Trunnion Rear Shock

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The Mara Pro Trunnion [paid link] rear shock from Manitou is a top-tier suspension component designed for high-performance mountain biking. Whether you’re tackling rough trails or going for long-distance rides, this rear shock plays a vital role in ensuring comfort and control. This guide will provide detailed instructions on how to install, adjust, maintain, and troubleshoot your Mara Pro Trunnion [paid link] shock, so you can keep it performing at its best.

Tools Required

  • 8mm Allen wrench [paid link]
  • 10mm socket wrench
  • Torque wrench [paid link]
  • Suspension fluid
  • Soft cloth or towel
  • A small brush (for cleaning)
  • Needle nose pliers
  • Grease (preferably for suspension components)
  • Shock pump
  • 2mm Allen wrench [paid link]
  • 5mm Allen wrench

Installation of Mara Pro Trunnion Rear Shock

Installing the Mara Pro [paid link] Trunnion rear shock requires precision to ensure optimal performance. The installation process is straightforward but requires attention to detail to avoid issues later.

  1. Prepare the Bike Frame: Begin by cleaning the area where the shock will be installed. Dirt and grime can interfere with the proper installation of the shock and affect its performance.
  2. Remove the Old Shock (if applicable): If you’re replacing an old shock, use your 8mm Allen wrench to remove the mounting bolts. Carefully detach the shock from the frame and set it aside.
  3. Insert the Mara Pro [paid link] Trunnion Rear Shock: Position the shock onto the trunnion mount of your bike frame. Ensure that the eyelet bushings are aligned correctly. The shock should sit firmly in place without any forced fitting.
  4. Secure the Shock: Use the 10mm socket wrench to tighten the mounting bolts. The torque should be applied as per the specifications in the manual, typically around 200-225 inch-pounds for the upper and lower shock mounts.
  5. Check the Alignment: Once installed, check that the shock is properly aligned and that no part of the shock is touching other components, like the frame or linkage.
  6. Recheck the Mounting Bolts: It’s crucial to verify that all bolts are properly torqued after a short ride to ensure they remain secure. Loose bolts can cause unwanted movement or damage to the frame.

Adjustment of the Mara Pro Trunnion Rear Shock

To get the best performance from your Mara Pro Trunnion rear shock, you need to adjust the settings according to your riding style and terrain. This shock features a range of adjustability for both compression and rebound.

Compression Adjustment

  1. Locate the Compression Dials: The Mara Pro Trunnion comes with low-speed and high-speed compression dials, usually located at the top of the shock.
  2. Adjust Low-Speed Compression: Turn the low-speed compression dial to fine-tune the responsiveness of the shock when dealing with smaller bumps. Turning it clockwise will increase compression, making the shock stiffer, while turning it counterclockwise will decrease it, offering a softer ride.
  3. Adjust High-Speed Compression: The high-speed compression adjustment deals with larger impacts. Turn the dial clockwise for firmer settings, or counterclockwise for a more plush feel.
  4. Fine-Tune During Ride: Go for a test ride and adjust on the go. Make small adjustments to the dials, riding through various terrains, to find the best balance for your needs.

Rebound Adjustment

  1. Locate the Rebound Dial: The rebound adjustment is typically located at the bottom of the shock.
  2. Adjust Rebound Speed: Turning the dial clockwise will slow down the rebound, while counterclockwise will speed it up. Slower rebound is ideal for rough terrain, as it allows more time for the shock to return to its original position after compression.
  3. Test and Re-adjust: After a test ride, adjust the rebound as needed to suit your riding conditions.

Maintenance of Mara Pro Trunnion Rear Shock

Regular maintenance of your Mara Pro Trunnion rear shock ensures longevity and maintains peak [paid link] performance. Here are some key steps to follow:

Cleaning and Lubing

  1. Clean the Shock Regularly: Use a soft cloth or towel to wipe down the shock after every ride. This helps to remove dirt and debris that can cause wear and tear over time. Pay special attention to the shaft and seals.
  2. Lubricate the Seals: Apply a small amount of suspension grease to the seals to prevent them from drying out. This will help to maintain the shock’s smooth action and reduce friction.
  3. Inspect the Shaft: Check the shock shaft regularly for any signs of damage, such as scratches or dents. A damaged shaft can affect the shock’s performance and cause oil leakage.

Suspension Fluid Replacement

  1. Remove the Shock from the Frame: Detach the shock from the bike frame as described in the installation section.
  2. Drain the Old Fluid: Use the 5mm Allen wrench to remove the fluid port on the shock. Allow the old suspension fluid to drain out completely. It’s advisable to replace the fluid every 50-100 hours of riding.
  3. Refill with Fresh Fluid: Refill the shock with the recommended suspension fluid. Be sure to use the right amount, as too much fluid can cause excessive pressure, and too little will reduce performance.
  4. Reassemble and Reinstall: After replacing the fluid, reassemble the shock, ensuring that all seals and parts are properly fitted. Reinstall the shock back onto the bike frame and check all mounting bolts.

Troubleshooting Common Issues

The Mara Pro Trunnion rear shock is a high-quality suspension component, but like any piece of machinery, it can develop issues over time. Here are a few common problems and how to resolve them:

Excessive Sag or Soft Ride

  • Cause: This could be due to insufficient air pressure in the shock or worn-out seals.
  • Solution: Use a shock pump to add air pressure to the shock. Check the manufacturer’s recommended pressure range based on your weight and riding style. If the seals are worn, it may be time to replace them.

No Rebound or Slow Rebound

  • Cause: Insufficient oil or dirty damping circuits can cause improper rebound.
  • Solution: Perform an oil change and clean the damping components. If the problem persists, check for air leaks in the rebound circuit or internal damage that may require a professional rebuild.

Noisy Shock

  • Cause: A noisy shock often indicates a lack of lubrication or an issue with the seals.
  • Solution: Apply more grease to the seals and check the shock shaft for any damage. Ensure the shock is properly aligned and not rubbing against the frame.

Customization and Optimization

The Mara Pro Trunnion rear shock can be optimized for different types of riding. Whether you are a cross-country rider, an enduro racer, or a downhill enthusiast, you can adjust the shock settings to suit your style.

  1. Adjust for Enduro: For enduro racing, you’ll want a firmer compression setting with a medium rebound speed. This ensures stability on both descents and ascents.
  2. Optimize for Downhill: For downhill riders, a softer compression setting and slower rebound will allow the shock to absorb big impacts efficiently, providing a smoother ride on rough terrain.
  3. Cross-Country Setup: Cross-country riders benefit from a firmer setup to ensure pedaling efficiency. Increase the compression and adjust the rebound to a medium setting to handle moderate terrain changes.

Compatibility with Other Drivetrain Components

The Mara Pro Trunnion rear shock is designed to work seamlessly with a wide range of mountain bike frames and components. However, it’s essential to check compatibility with your frame’s suspension linkage and shock mounting hardware.

  • Linkage Compatibility: Ensure that your bike frame supports trunnion-mount shocks. Some frames may require specific adapters to ensure a proper fit.
  • Shock Hardware: Verify that the mounting hardware provided with your Mara Pro Trunnion shock matches the frame’s shock mounts. If necessary, you can purchase adapters or different sizes of eyelets.

By ensuring that all components are compatible, you can maximize the shock’s performance and avoid any installation issues.

Conclusion

With proper installation, adjustment, and maintenance, your Mara Pro Trunnion rear shock will continue to provide outstanding performance on every ride. Regular care and attention will help maintain its longevity, allowing you to enjoy smooth, controlled descents and efficient climbing for many rides to come.