Step-by-Step Rear Shock Oil Change for Float SL Factory

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The Fox Float SL Factory rear shock is a high-performance suspension component designed for mountain biking enthusiasts seeking precision, durability, and top-notch performance. To ensure that your Float SL Factory rear shock continues to perform at its best, regular oil changes are necessary. This step-by-step guide will walk you through the process of changing the shock oil, helping you keep your suspension system in optimal condition.

Tools Required

  • Shock pump
  • Fox Float SL Factory service kit
  • 5mm, 8mm, and 10mm wrenches
  • Torque wrench [paid link]
  • 15mm socket wrench
  • Small container for draining oil
  • Cleaning rags
  • Synthetic suspension fluid (Fox recommends using their specific oil for the Float SL Factory model)
  • Latex gloves for safety
  • 1.5mm, 2.5mm, and 3mm Allen wrenches [paid link]

Preparation

Before starting the oil change process, make sure you have the correct replacement oil and tools at hand. Take safety precautions by wearing gloves and ensuring that your workspace is clean and well-lit. It’s recommended to perform this procedure on a workbench or a stable surface.

Step 1: Remove the Rear Shock from the Bike

Start by removing the rear shock from the bike frame to make the service process easier. Use a 5mm and 8mm wrench to disconnect the shock from the frame. Carefully note the mounting position and orientation of the shock as it’s important to reinstall it correctly later.

Step 2: Drain Old Oil

Place the shock into a clean container or tray. At this stage, you need to drain the old oil. Locate the Schrader valve (usually located at the top of the shock) and press it gently to release any pressure. Once the air is out, use a 10mm socket to remove the compression damper bolt, allowing the old oil to drain from the shock.

  • Tilt the shock at a slight angle to ensure all the oil drains completely.
  • Be sure to dispose of the old oil according to local environmental regulations.

Step 3: Disassemble the Shock

With the oil drained, proceed to disassemble the shock. Start by removing the air can from the shock body. Use an 8mm wrench to remove the bolts that hold the air can in place. Carefully separate the air can from the main shock body. You may need to tap it lightly with a rubber mallet to loosen it if it’s stuck.

Once the air can is off, set it aside. Use your 2.5mm and 3mm Allen wrenches [paid link] to remove the rebound and compression adjuster knobs from the shock. Be cautious not to damage the threads during this step.

Step 4: Clean the Components

Once the shock is disassembled, use cleaning rags to wipe down the shock body and air can. Ensure that all components, including the piston, seals, and damper assembly, are thoroughly cleaned. Be meticulous when cleaning the oil bath and damper parts to remove any dirt or contaminants that might affect the shock’s performance.

Inspect the seals for any wear or damage. If the seals are compromised, you may need to replace them before proceeding.

Step 5: Reassemble the Shock and Refill with Fresh Oil

Now that all parts are cleaned and inspected, it’s time to reassemble the shock. Begin by applying a thin layer of fresh oil to the piston and damper assembly. This will help lubricate the internal parts and prevent dry friction when you first inflate the shock.

  • Reinstall the rebound and compression adjusters by tightening them with the appropriate wrenches.
  • Carefully reinstall the air can on the shock body, ensuring that it fits snugly and is aligned properly. Secure the bolts with an 8mm wrench, tightening them to the manufacturer’s specified torque settings (usually listed in the service manual).

Once the shock is reassembled, it’s time to refill it with new oil. Use the recommended Fox suspension fluid and pour it into the shock body through the oil fill port. Check your service manual for the correct volume of oil for the Float SL Factory model. After filling, perform a few compression cycles to ensure the oil fills the internal chambers properly.

Step 6: Set the Correct Air Pressure

After the shock is filled with oil and reassembled, you will need to set the correct air pressure. Use a shock pump to inflate the air can to the recommended pressure, which can typically be found on the shock label or in the user manual. The air pressure affects the shock’s overall performance, so it’s essential to adjust it according to your riding style and weight.

Make small adjustments and check the performance of the shock before finalizing the pressure.

Step 7: Reinstall the Shock

With the oil change complete and the air pressure set, it’s time to reinstall the shock onto the bike. Align the shock with the frame mounting points and carefully secure it with the bolts you previously removed. Use the correct torque specifications to ensure a proper fit.

Step 8: Perform a Test Ride

Before going on your regular ride, it’s important to test the shock. Take your bike for a short ride to check the shock’s performance. Listen for any unusual sounds, and feel for any inconsistencies in the suspension. Pay attention to rebound and compression settings and adjust them as necessary.

If the shock is not functioning as expected, you may need to readjust the oil volume or air pressure or check for any issues with the seals.

Troubleshooting Common Issues

  • Leaking Oil: If you notice oil leaking from the shock, it may be a sign of a damaged seal or improperly tightened air can bolts. Inspect and replace the seals if needed.
  • Inconsistent Rebound or Compression: This could be due to an incorrect oil volume or improper installation of the damper parts. Recheck the oil levels and make sure all internal components are installed correctly.
  • Air Pressure Issues: If the air pressure is not holding, inspect the Schrader valve for any leaks. If necessary, replace the valve or check for damaged parts.

Conclusion

Changing the oil in your Fox Float SL Factory rear shock is a critical maintenance step that helps maintain its performance and longevity. By following these detailed steps, you can ensure that your shock operates smoothly and efficiently. Regular maintenance will keep your ride comfortable and responsive, allowing you to enjoy the best possible suspension performance on every ride.