When it comes to maintaining your RockShox Monarch RT3 rear shock, regular oil changes are essential to ensure smooth performance and longevity. This guide will take you through a comprehensive, step-by-step process to change the oil in your Monarch RT3 rear shock. Whether you’re a seasoned mechanic or a rider looking to perform your own maintenance, this guide will provide the necessary steps and tips to get the job done right.
Tools Required
- 5mm Allen wrench [paid link]
- 8mm Allen wrench [paid link]
- 2.5mm Allen wrench
- Torque wrench [paid link]
- Shock pump
- 10mm socket wrench
- T25 Torx wrench [paid link]
- Oil (RockShox recommended suspension fluid)
- Rags and paper towels
- Plastic syringe or fluid transfer tool
- New seals (if necessary)
Preparing the Rear Shock
Before you begin the oil change process, it’s important to prepare the Monarch RT3 rear shock for servicing.
Step 1: Remove the Rear Shock from the Bike
To begin, remove the rear shock from the frame by using the appropriate Allen wrenches [paid link] to unbolt it. Make sure you carefully note the position of the shock’s mounting hardware for reinstallation.
Step 2: Clean the Shock and Surrounding Area
Once the shock is removed, clean the shock body and any dirt or debris that may have accumulated on the shock or around the seals. This helps prevent any contaminants from entering the shock during the oil change process.
Disassembling the Monarch RT3
Step 3: Remove the Air Canister
Using a 5mm Allen wrench, unscrew the air canister from the shock body. Be sure to do this slowly and carefully, as you’ll need to preserve the internal components. After the air canister is removed, inspect the seals for any damage. If necessary, replace the seals before continuing.
Step 4: Release the Air Pressure
Before fully disassembling the Monarch RT3, ensure that there is no remaining air pressure in the shock. Use a shock pump to fully depressurize the shock. It is essential that there is no air left in the system before you continue.
Step 5: Remove the Schrader Valve
If your model has a Schrader valve, use a 2.5mm Allen wrench to carefully remove it from the air canister. Be cautious not to lose any small parts during this process.
Draining the Old Oil
Step 6: Remove the Shock’s Damper Assembly
The damper assembly contains the fluid that controls the rebound and compression damping. Use the appropriate tools to carefully remove it from the shock body. This is a delicate part, so avoid applying unnecessary force. You may need to use a T25 Torx wrench [paid link] to remove the damping unit.
Step 7: Drain the Old Oil
Place the shock body over a container or rag to collect the old oil. Remove the damper from the shock body and allow the oil to drain out completely. This step is essential to ensure that all old fluid is removed before adding the new oil. If the oil appears excessively dirty, consider inspecting the shock for internal wear or damage.
Cleaning and Inspecting Components
Step 8: Clean the Internal Components
Thoroughly clean the internal components of the shock. Use a clean rag or paper towel to wipe down the damper and air canister. It’s important to remove any old oil and contaminants that might affect the performance of the shock.
Step 9: Inspect for Wear or Damage
Before reassembling, inspect the seals and internal components for signs of wear or damage. Check for any scratches or nicks in the shock body, damper, and air canister. If necessary, replace any worn or damaged seals. Additionally, inspect the piston and rebound adjuster for any signs of malfunction.
Reassembling the Monarch RT3
Step 10: Refill with Fresh Oil
Using the RockShox recommended suspension oil, fill the shock with the appropriate amount of fluid. You can use a plastic syringe or fluid transfer tool to ensure precise oil placement. Be sure to follow the manufacturer’s guidelines for the correct fluid volume.
Step 11: Reinstall the Damper
After adding the fresh oil, reinstall the damper assembly into the shock body. Carefully thread it into place, ensuring that it is aligned properly. Tighten it according to the recommended torque specifications, which can typically be found in the Monarch RT3 service manual.
Step 12: Reinstall the Schrader Valve (If Applicable)
If you removed the Schrader valve earlier, reinstall it into the air canister. Ensure that it is seated correctly and tightened securely.
Step 13: Reassemble the Shock
With the damper and Schrader valve reinstalled, carefully place the air canister back onto the shock body. Tighten it using a 5mm Allen wrench. Be sure not to overtighten, as this could damage the seals or the shock body.
Reinstalling the Shock on the Bike
Step 14: Reinstall the Shock on the Frame
Once the oil change and reassembly are complete, carefully reinstall the Monarch RT3 rear shock back onto your bike’s frame. Use the appropriate Allen wrenches [paid link] to securely fasten the mounting bolts. Ensure that the shock is properly aligned and that all hardware is tightened to the manufacturer’s recommended torque.
Step 15: Set the Air Pressure
Using a shock pump, set the correct air pressure for your rider weight and riding style. Be sure to check the air pressure after installation to ensure that it is correct and there are no air leaks.
Final Adjustments and Testing
Step 16: Check for Leaks
After installation, perform a quick check for any signs of oil leaks. This can be done by gently compressing the shock and checking the seals. If any leaks are noticed, double-check the assembly and ensure that all components are properly seated.
Step 17: Test the Shock
With the shock back on the bike, perform a quick ride test to check the performance of the shock. Pay attention to any unusual sounds, such as knocking or squeaking, which could indicate issues with the seals or damper. If everything operates smoothly, you’re done!
Troubleshooting Common Set-Up Issues
If you experience issues after completing the oil change, here are some common problems and their solutions:
- Shock Does Not Hold Air: This could be due to a damaged Schrader valve or seal. Inspect and replace as necessary.
- Excessive Rebound or Compression: If the shock is too stiff or too soft, check the oil levels and adjust the rebound/compression settings.
- Leaking Oil: If the shock leaks oil, it could be a sign of worn seals or improper assembly. Check the seals and replace if needed.
Conclusion
Changing the oil in your RockShox Monarch RT3 rear shock is an essential maintenance task that helps keep your bike’s suspension system running smoothly. By following these steps carefully, you can ensure that your shock stays in top condition and continues to perform at its best. Remember to regularly check your shock’s condition and oil levels to avoid any premature wear or damage.