Rebuilding your Monarch RT3 rear shock can significantly enhance its performance and extend its lifespan. While it may seem like an intimidating task, performing a rebuild at home is entirely possible with the right tools, instructions, and patience. This guide will walk you through the necessary steps to successfully disassemble, clean, reassemble, and adjust the Monarch RT3 rear shock, ensuring it continues to deliver optimal performance on your bike.
Tools Required
To properly rebuild your Monarch RT3 rear shock, you will need the following tools:
- 5mm Allen wrench [paid link]
- 8mm Allen wrench [paid link]
- Shock pump (for recharging air pressure)
- Clean rags and brushes
- Torque wrench [paid link]
- RockShox Reba or Monarch service kit (including seals and oil)
- Oil bath or clean container for soaking parts
- Small screwdriver (for removing and adjusting small components)
- Adjustable spanner or shock nut tool
- Hydraulic shock fluid (specific to RockShox)
- Teflon tape or anti-seize compound (optional for reassembly)
Ensure you have all the necessary tools before beginning the rebuild process.
Step-by-Step Guide to Rebuilding Your Monarch RT3 Rear Shock
1. Prepare Your Work Area
Start by setting up a clean, organized workspace. It’s essential to work in an area free of dirt or debris to prevent contaminating the internal components of the rear shock. Lay down clean rags and have your tools easily accessible.
2. Remove the Shock from the Bike
The first step in disassembling the Monarch RT3 rear shock is to remove it from your bike. Use the appropriate tools to unscrew the shock mounting bolts. Be sure to record the position of any washers, spacers, or bushings to reassemble them correctly later.
3. Release the Air Pressure
Before you start taking the shock apart, it’s crucial to release the air pressure. Use a shock pump to slowly remove the air pressure in a controlled manner. Doing this reduces the risk of internal components popping out unexpectedly.
4. Remove the Air Sleeve and Spring
Using a 5mm Allen wrench, remove the bolts securing the air sleeve to the main body of the shock. Once the bolts are removed, carefully slide off the air sleeve. If your Monarch RT3 is a coil shock, you’ll also need to remove the coil spring.
5. Disassemble the Damper Cartridge
To access the damper internals, use an 8mm Allen wrench to remove the damper bolt from the shock’s body. Afterward, gently pull the damper cartridge out from the shock body. Be cautious when handling the cartridge, as it contains sensitive internal components that should not be damaged during removal.
6. Clean All Components
Once the shock is disassembled, clean each component thoroughly. Use clean rags and brushes to wipe off any dirt or old oil from the shock body, air sleeve, and damper cartridge. You may want to soak the internal parts in a clean oil bath to ensure no contaminants are left behind.
7. Replace Seals and Oil
The most common wear points on a shock are the seals and oil. Replace all seals using the service kit. These include the seals in the air sleeve and the damper cartridge. Apply the recommended hydraulic fluid to the internal components and the new seals. Ensure that the oil level is correct, as improper oil levels can lead to poor shock performance.
8. Reassemble the Shock
After cleaning and replacing all necessary seals and oil, it’s time to reassemble the shock. Start by inserting the damper cartridge back into the shock body. Be sure to torque the damper bolt to the specified torque setting to avoid damaging the shock. Then, reattach the air sleeve and tighten the bolts securely.
9. Charge the Shock with Air
Once the shock is reassembled, use your shock pump to charge the shock with the appropriate air pressure. Refer to the manufacturer’s specifications for the correct air pressure based on your rider weight and riding style. Make sure the air valve is tightly sealed after you finish.
10. Final Check and Installation
Perform a final inspection of the shock to ensure everything is properly assembled and secure. Check the torque on all bolts and ensure that no components are loose. Once satisfied, reinstall the shock onto your bike by reversing the removal steps. Reattach the shock mount bolts and ensure that all washers, spacers, and bushings are correctly positioned.
11. Test the Shock
Before heading out on a ride, test the rear shock by compressing it to ensure it operates smoothly. If you notice any issues such as excessive rebound or a lack of dampening, you may need to adjust the air pressure or fine-tune the rebound settings using the external adjuster knob.
Troubleshooting Common Issues
Even with proper maintenance, you may encounter issues with your Monarch RT3 rear shock. Below are some common problems and solutions:
1. Excessive Rebound or Slow Compression
- Solution: Check that the rebound and compression adjusters are set correctly. If the shock feels too slow or too fast, you may need to adjust the settings or ensure the damper oil is at the correct level.
2. Shock Leaking Air
- Solution: Inspect the air sleeve seals for damage. If air is leaking from the shock, it could be due to worn seals that need replacing.
3. Unresponsive Shock
- Solution: If the shock is unresponsive or feels too soft, verify that the correct amount of oil is inside the damper and air sleeve. Insufficient oil can lead to poor performance and a lack of rebound control.
4. Noise or Creaking Sounds
- Solution: Creaking noises are often caused by improper lubrication or dry seals. Reapply lubricant and ensure all components are properly greased during reassembly.
Customization and Optimization for Better Performance
Once your Monarch RT3 rear shock is rebuilt and reinstalled, you may want to fine-tune it for your specific riding preferences. Here are some tips for optimizing its performance:
1. Adjust the Air Pressure
The Monarch RT3 features an air spring system that allows you to adjust the shock’s performance. Adjusting the air pressure based on your weight and riding style will provide a more responsive and comfortable ride. For aggressive downhill riding, you may want slightly higher air pressure, while for cross-country riding, a lower air pressure can provide more comfort.
2. Fine-Tune the Rebound and Compression
The Monarch RT3 includes external rebound and compression adjusters. Adjusting the compression allows you to change how the shock responds to impacts, while the rebound setting controls how fast the shock returns to its original position. Experiment with different settings to find the optimal balance for your riding style.
3. Consider Upgrading to a Better Damper Fluid
Using high-quality damper fluid will ensure better performance and longer life for your shock. If you are riding in extreme conditions or on rough terrain, upgrading to a premium oil can help improve the consistency of the shock’s dampening.
Compatibility with Other Drivetrain Components
The Monarch RT3 rear shock is compatible with most modern mountain bike drivetrains, but you should always check for compatibility with your bike’s frame and other suspension components before installation. Ensure that the shock’s eyelet length, stroke, and mounting hardware are compatible with your bike. Additionally, pay attention to the rear triangle’s design and make sure the shock fits within the available space.
By following this guide and performing regular maintenance on your Monarch RT3 rear shock, you can ensure your bike’s suspension system continues to perform at its best. Rebuilding your rear shock at home is a cost-effective way to maintain your bike’s performance and prolong its lifespan.