Step-by-Step Rear Shock Oil Change for Monarch Plus RC3

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The RockShox Monarch Plus RC3 rear shock is a critical component for riders seeking premium suspension performance on their mountain bikes. Maintaining the shock’s internal oil is essential for optimal damping performance, longevity, and overall ride quality. Regular oil changes prevent buildup of dirt and contaminants, which can degrade shock performance over time. This detailed guide will walk you through the process of changing the oil in your Monarch Plus RC3 rear shock, ensuring that you maintain peak performance for your rides.

Tools Required

  • RockShox suspension oil (appropriate grade, usually 5wt or 15wt)
  • Shock pump
  • 8mm socket or wrench
  • 10mm socket or wrench
  • T25 and T30 Torx drivers
  • 24mm socket (for larger parts)
  • Seal press tool (if applicable)
  • Clean rags
  • Torque wrench [paid link]
  • Small plastic funnel
  • Disassembly stand or a stable workbench

Disassembly of the Monarch Plus RC3 Rear Shock

Before proceeding with the oil change, you must remove the shock from your bike and disassemble it carefully. This step ensures you can access the internal components for proper maintenance.

  1. Remove the shock from the bike frame:
    • Use a 5mm or 6mm Allen wrench [paid link] to unscrew the mounting bolts that attach the shock to the frame.
    • Keep the hardware in a safe place, as you’ll need it when reattaching the shock after maintenance.
  2. Set up your work area:
    • Secure the shock in a suspension stand or place it on a clean, stable surface.
    • Make sure the shock is positioned upright to prevent oil spillage.
  3. Release air pressure:
    • Use the shock pump to slowly release any air pressure from the Monarch Plus RC3.
    • Carefully remove the air valve cap before unscrewing the valve. This ensures no residual pressure remains inside the shock.
  4. Remove the damper body and air can:
    • Using a T25 or T30 Torx driver, remove the screws that hold the damper body to the shock.
    • Gently separate the air can from the damper body, exposing the internal components.

Draining the Old Oil

At this point, you will be able to drain the old oil, which is critical for ensuring that the shock operates with fresh, clean fluid.

  1. Drain the damper oil:
    • Position the shock so that it is draining into a container or a rag.
    • Tilt the shock to ensure that all oil drains from the damper body.
    • Use a clean rag to wipe any excess oil from the exterior of the shock.
  2. Inspect the oil for contamination:
    • Take a moment to examine the old oil. Any signs of excessive dirt, bubbles, or metallic particles indicate that the shock may need further servicing.
    • If the oil appears unusually dirty, consider servicing other internal components like the seals and piston.

Cleaning the Components

A thorough cleaning of the shock components is essential before refilling with fresh oil. This ensures no debris or contaminants interfere with the shock’s performance.

  1. Clean the damper body and air can:
    • Use a clean, lint-free rag to wipe down the damper body and air can.
    • Make sure to remove any dirt, oil residue, or grime that could interfere with the shock’s function.
  2. Inspect for wear:
    • Look for any signs of damage, including scratches or indentations on the shock’s body, which could affect performance or cause leaks.
    • Replace seals or O-rings if they show signs of wear.

Refilling the Monarch Plus RC3 with New Oil

Now that the shock components are clean, it’s time to refill the Monarch Plus RC3 with fresh oil. Be sure to use the correct suspension oil as specified by RockShox for the Monarch Plus RC3.

  1. Prepare the oil:
    • Use the appropriate suspension oil (usually 5wt or 15wt) for the damper chamber. Check the Monarch Plus RC3 manual to confirm the recommended oil type.
    • Pour the oil into a clean container, ensuring there are no contaminants inside.
  2. Refill the damper body:
    • Using a small funnel, begin refilling the damper body with the new oil. It’s essential to follow the exact oil volume specified by RockShox to ensure proper shock function.
    • Fill the damper body to the specified level, being careful not to overfill.
  3. Install the damper piston and reassemble:
    • Once the oil is added, reassemble the damper piston and ensure it is seated correctly.
    • Install the damper body back into the shock assembly.

Sealing and Reassembly

After the oil has been added and the internal components are cleaned, it’s time to put everything back together.

  1. Replace seals and O-rings:
    • If the shock uses seals or O-rings, replace these parts to ensure a tight, secure seal when reassembled.
    • Apply a small amount of suspension grease to the seals to reduce friction.
  2. Reattach the air can:
    • Carefully slide the air can back onto the damper body, ensuring that it aligns correctly.
    • Tighten all screws securely using the correct torque specifications.
  3. Check for air leaks:
    • Before attaching the shock back to your bike, use a shock pump to check for any air leaks.
    • Pump the shock to the desired pressure and verify that the shock holds air without leaking.

Reinstallation and Final Adjustment

After completing the oil change, it’s time to reinstall the shock on your bike and make any necessary adjustments to ensure proper performance.

  1. Reinstall the shock on your bike:
    • Use the hardware you saved earlier to reinstall the shock onto the bike frame.
    • Tighten the mounting bolts securely using a torque wrench [paid link].
  2. Recheck air pressure:
    • Adjust the air pressure to your desired level, depending on your weight and riding style.
    • Use a shock pump to adjust the air pressure in the Monarch Plus RC3.
  3. Perform a basic setup test:
    • Cycle through the shock’s settings (rebound, compression, etc.) and ensure that it functions correctly.
    • If necessary, adjust the damping settings for your specific riding style.

Troubleshooting Common Issues

Even with regular maintenance, some issues may arise during the oil change process. Below are some common issues and troubleshooting tips:

  • Shock does not hold air:
    • If the shock does not hold air after reassembly, check for damaged seals or improper assembly. Replace any worn seals and reassemble the shock carefully.
  • Oil leakage:
    • If you notice oil leaking from the shock after the oil change, ensure that all parts are properly tightened and that the seals are intact. It may also indicate that the seals need replacing.
  • Unresponsive shock:
    • If the shock feels unresponsive after the oil change, it may be due to incorrect oil volume or improper damping adjustments. Check the oil level and make necessary adjustments to the shock’s settings.

Final Thoughts

Performing a rear shock oil change for your RockShox Monarch Plus RC3 is a critical part of bike maintenance that ensures your suspension continues to perform at its best. By following these detailed steps, you can ensure that your shock remains in excellent condition, offering smooth, responsive suspension on every ride. Regular maintenance helps extend the lifespan of the shock and improves overall ride quality, so make it a part of your routine bike care.