Step-by-Step Rear Shock Oil Change for STX22 Coil

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The Öhlins STX22 Coil rear shock is designed to offer superior damping performance and long-lasting durability. As with any high-performance component, regular maintenance is key to ensuring optimal function and extending the lifespan of the shock. One of the most important maintenance tasks for the STX22 Coil is the oil change. Over time, the oil inside the shock can degrade, which affects the shock’s performance. This step-by-step guide will walk you through the process of changing the oil in your STX22 Coil rear shock, allowing you to keep it performing at its best.

Tools Required

  • Öhlins STX22 Coil rear shock
  • Shock pump
  • 5mm Allen wrench [paid link]
  • 8mm Allen wrench [paid link]
  • Torx T25 driver
  • Oil drain pan
  • Replacement oil (Öhlins or equivalent)
  • O-ring pick or small flathead screwdriver
  • Clean rag or towel
  • Torque wrench [paid link]
  • Oil syringe or filling syringe (for precise oil measurement)
  • 20mm socket (if needed)

Preparing the Rear Shock for Oil Change

Before starting the oil change, make sure you have the necessary tools and parts ready. The STX22 Coil shock has been designed for ease of maintenance, but proper preparation ensures a smoother process.

1. Remove the Shock from the Bike

  • Begin by removing the rear shock from the bike. This is typically done by using a 5mm Allen wrench to remove the bolts securing the shock to the frame and the swingarm.
  • Once the shock is detached, set it on a clean work surface, ensuring it is stable and protected from scratches or dirt.

2. Release Air Pressure

  • Using a shock pump, release any air pressure from the shock by slowly unscrewing the valve. This step is essential to safely work with the shock and avoid damage to the internal components.

Draining the Old Oil

Draining the old oil is a crucial step in the oil change process. The used oil can affect the performance of your shock and may contain contaminants that could damage the internal seals.

1. Remove the Shock’s Eyelets and Spring

  • Use an 8mm Allen wrench to unscrew the eyelet bolts at both ends of the shock.
  • Once the bolts are removed, carefully slide the spring off the shock’s body. Depending on your model, the spring may need to be compressed slightly to remove it.

2. Remove the Shock’s End Caps

  • Use a Torx T25 driver to remove the screws securing the end caps of the shock.
  • Once the screws are removed, gently pull off the end caps. Be careful not to damage the threads or seals during this process.

3. Drain the Oil

  • Position the shock over a drain pan to catch the old oil.
  • Hold the shock with the piston side facing downward and allow the oil to drain completely. You may need to gently tap the shock body or rotate it slightly to ensure all oil is removed.
  • Use a clean rag to wipe down the exposed internal parts.

Cleaning and Inspecting the Shock

While the shock is disassembled, this is the perfect opportunity to clean it and inspect the internal components for wear or damage.

1. Clean the Shock Components

  • Use a clean rag to wipe down the shock body, piston, and any other exposed internal components.
  • Ensure that no dirt, debris, or old oil remains inside the shock body or on the piston.

2. Inspect Seals and Bushings

  • Check the shock’s seals, bushings, and other moving parts for signs of wear, cracks, or damage. If any components appear worn or damaged, they should be replaced before reassembly.

Refilling the Shock with New Oil

Now that the old oil is drained and the shock is clean, it’s time to refill the shock with new oil. Proper oil filling is critical to ensuring the shock performs correctly and maintains the correct pressure and damping characteristics.

1. Choose the Correct Oil

  • Use the recommended oil type for your Öhlins STX22 Coil shock. Typically, Öhlins recommends their own branded oil, but other equivalent oils with the same viscosity can also be used.
  • Check the user manual for the specific oil volume and type for your shock model.

2. Fill the Shock with Oil

  • Use an oil syringe or filling syringe to accurately measure the required oil volume for the STX22 Coil shock.
  • Slowly inject the oil into the shock body, making sure to avoid air bubbles and ensuring the oil fills the shock completely.

3. Reassemble the Shock

  • Once the shock is filled with the correct amount of oil, begin reassembling the shock by reversing the disassembly steps.
  • Reinstall the end caps using a Torx T25 driver, making sure the screws are tightened securely.
  • Slide the spring back onto the shock, ensuring it is properly positioned and seated.
  • Reinstall the eyelets using an 8mm Allen wrench, tightening them to the specified torque.

Reinstalling the Shock

Now that the oil change is complete, the shock is ready to be reinstalled on the bike.

1. Mount the Shock to the Frame

  • Reattach the shock to the frame by securing it with the appropriate bolts and tightening them to the manufacturer’s specified torque.
  • Ensure the shock is properly aligned with the frame and swingarm before tightening the bolts.

2. Check for Leaks

  • Once the shock is reinstalled, it’s essential to check for any oil leaks. Re-inflate the shock to the correct pressure using a shock pump, and inspect the shock body for any signs of leaking oil. If there are leaks, recheck the seals and end caps to ensure they are properly installed and tightened.

3. Set the Sag

  • After reinstalling the shock, check the sag and adjust the air pressure if necessary. Adjust the preload of the coil spring to achieve the correct sag for your weight and riding style.

Troubleshooting Common Oil Change Issues

1. Difficulty Removing the End Caps

  • If you’re having trouble removing the end caps, try using a plastic pry tool to gently loosen them. Be cautious not to damage the threads or seals in the process.

2. Air Bubbles in the Oil

  • If you notice air bubbles in the oil after filling, use a syringe to slowly draw out any trapped air. You can also gently tap the shock to help the bubbles rise to the surface.

3. Oil Leaks After Reassembly

  • If you notice oil leaking after reassembling the shock, it may indicate that the seals or end caps were not installed correctly. Double-check that all parts are seated properly and that the screws are torqued correctly.

Conclusion

Performing an oil change on your Öhlins STX22 Coil rear shock is a critical part of maintaining its performance and longevity. By following the steps outlined in this guide, you can ensure that your shock continues to perform at its best, providing optimal damping and comfort during your rides. Regular maintenance, such as oil changes, will not only enhance your bike’s performance but also extend the life of the rear shock, helping you get the most out of your investment.