How to Service Your Monarch Plus RC3 Rear Shock Without a Mechanic

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Servicing the RockShox Monarch Plus RC3 rear shock is a vital part of maintaining your bike’s suspension system. While many riders choose to send their shocks to a professional mechanic, performing regular maintenance on your own is both rewarding and cost-effective. This guide will walk you through the process of servicing your Monarch Plus RC3 shock, from disassembly to reassembly, ensuring it operates smoothly and reliably.

Tools Required

  • Shock pump
  • 10mm and 5mm Allen wrenches [paid link]
  • 2.5mm Allen wrench [paid link]
  • Suspension fluid (e.g., RockShox 15wt for the Monarch Plus RC3)
  • Oil bath cleaning container
  • Grease
  • T25 Torx wrench [paid link]
  • Torque wrench [paid link] (for precise reassembly)
  • Rags for cleaning
  • Plastic syringe or oil pump for fluid transfer
  • Small flathead screwdriver (for sealant removal)

Understanding the Monarch Plus RC3 Rear Shock

The RockShox Monarch Plus RC3 rear shock is designed for high-performance mountain biking, offering adjustable rebound, compression damping, and a variety of tuning options. It features the Solo Air spring system and an advanced external reservoir, which allows for increased support and a smoother ride over rough terrain.

Before diving into the service process, it’s important to understand the main components of the Monarch Plus RC3 rear shock:

  • Solo Air Spring: Provides a consistent and customizable air pressure for various rider weights and conditions.
  • External Reservoir: Enhances oil flow and improves overall shock performance.
  • RC3 Damping: Allows for adjustable rebound and compression settings to fine-tune performance.
  • Damper Assembly: A critical component that controls the shock’s behavior by adjusting damping forces in response to different trail conditions.

Step-by-Step Guide to Servicing Your Monarch Plus RC3

1. Remove the Shock from the Frame

To begin servicing your Monarch Plus RC3 shock, you must first remove it from the bike frame. This requires using a 5mm Allen wrench [paid link] to remove the bolts securing the shock. Take note of the exact positions of any spacers or washers, as these will need to be reinstalled later.

2. Clean the Shock Exterior

Before you start disassembling the shock, clean the exterior thoroughly with a rag. Dirt and debris can damage internal components, so ensure everything is wiped down to avoid contamination during the servicing process.

3. Remove the Air Can

The Monarch Plus RC3 features an air can that must be removed to access the internal damper assembly. Use a 10mm Allen wrench to remove the bolts that secure the air can to the shock body. Once the bolts are removed, gently separate the air can from the shock body, being careful not to damage any internal seals.

4. Release the Air Pressure

Use a shock pump to release the air pressure from the shock. It’s essential to do this step before continuing any further to avoid injury or damage. Once the air pressure is released, remove the air valve core from the shock’s air spring using a small flathead screwdriver.

5. Disassemble the Damper Cartridge

Now, using a 2.5mm Allen wrench, carefully remove the small screws holding the damper cartridge in place. Be mindful of any washers or seals that may be present, as these will need to be reassembled later. Carefully pull the damper out of the shock body.

6. Inspect and Clean the Internal Components

Once the damper assembly is removed, inspect all internal components for wear or damage. Clean the damper, air spring, and seals with suspension fluid or a suitable degreaser. You can use a plastic syringe or oil pump to help transfer fluid and clean the parts effectively.

7. Replace Seals and O-Rings

Check all seals and O-rings for any signs of wear or cracking. If any are damaged, replace them with new parts. This is an important step in maintaining the performance and longevity of your shock. Lubricate the new seals with a light coat of suspension fluid before reassembly to ensure a proper seal.

8. Reassemble the Damper and Air Can

Once all parts have been cleaned and inspected, it’s time to reassemble the damper cartridge. Place the damper back into the shock body, securing it with the small screws you removed earlier. Ensure that the seals are properly seated to prevent air and oil leakage. Reinstall the air can, securing it with the bolts and ensuring everything is tight.

9. Reinstall the Shock on the Bike

Once your Monarch Plus RC3 shock has been reassembled, it’s time to reinstall it onto your bike. Attach the shock to the frame using the bolts you removed earlier. Ensure that the washers and spacers are correctly positioned to avoid any issues with alignment.

10. Reinflate the Shock

Using a shock pump, inflate the shock to your desired pressure based on your weight and riding style. The recommended pressure will vary depending on rider preferences, but a typical starting point is around 200-225 psi for most riders.

11. Check and Adjust Settings

After the shock is installed and inflated, check the rebound and compression settings to ensure they are at your preferred settings. The Monarch Plus RC3 features external dials for adjusting rebound and compression, allowing you to fine-tune the shock for optimal performance on different trail conditions.

Troubleshooting Common Set-Up Issues

While servicing the Monarch Plus RC3, you may encounter certain issues. Here are a few common problems and how to troubleshoot them:

  • Shock Leaking Air: If your shock is leaking air, check the seals and O-rings. Damaged or worn seals are the most common cause of air leakage.
  • Inconsistent Performance: If the shock feels inconsistent, there may be an issue with the damper assembly. Make sure all internal components are clean and free of debris.
  • No Rebound Adjustment: If you’re unable to adjust rebound, the rebound damper may be clogged or damaged. Clean the damper assembly and inspect the rebound circuit for any blockages.

Customization and Optimization for Better Performance

The Monarch Plus RC3 is designed to be highly customizable, allowing riders to adjust the shock for different riding conditions. Here are a few ways to optimize its performance:

  • Adjust Rebound and Compression: Fine-tuning the rebound and compression damping will allow you to customize how the shock responds to different terrain. For aggressive riders, a faster rebound may be preferred, while smoother riders may prefer a slower rebound.
  • Experiment with Air Pressure: Adjusting the air pressure based on your weight and riding style can significantly change the shock’s performance. Higher pressures provide more support, while lower pressures allow for a more plush ride.
  • Upgrade to a Higher-Quality Oil: For improved performance and longevity, consider upgrading to a high-quality suspension fluid that is compatible with the Monarch Plus RC3.

Compatibility with Other Drivetrain Components

When servicing your Monarch Plus RC3 rear shock, it’s essential to consider its compatibility with other drivetrain components, especially the rear triangle and frame. The shock is compatible with most modern full-suspension frames that feature a standard shock mount. However, always verify the frame manufacturer’s specifications to ensure the shock will fit properly.

Additionally, make sure that the shock’s travel and dimensions align with the frame’s design. Using a shock that is too long or short for your frame can negatively affect handling and performance.

By following this guide and performing regular maintenance on your Monarch Plus RC3 rear shock, you can ensure that your suspension continues to perform at its best, keeping you ready for any trail conditions that come your way.