How to Install, Adjust, and Maintain the Shimano FH-RS400 Hub

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The Shimano FH-RS400 [paid link] hub is a high-quality rear hub designed for road bikes, offering exceptional durability and performance. Whether you’re installing the hub for the first time, adjusting it for optimal performance, or maintaining it for long-term use, this guide covers everything you need to know to ensure your Shimano FH-RS400 [paid link] hub operates smoothly and efficiently.

Tools Required

Before getting started, make sure you have the following tools at hand:

  • Cone wrenches (typically 13mm and 15mm)
  • 5mm Allen wrench [paid link]
  • Grease (lubricant suitable for hubs)
  • Cleaning cloth
  • Hub oil (specific for Shimano hubs)
  • Torque wrench [paid link]
  • Replacement bearings (if necessary)
  • Spoke wrench
  • Park Tool BBT-9 or similar bearing press [paid link] (for bearing installation)

Installation of the Shimano FH-RS400 Hub

Installing the Shimano FH-RS400 [paid link] hub involves ensuring that all parts are correctly fitted and properly torqued. Follow these steps to install the hub correctly:

  1. Prepare the Hub: Unbox your Shimano FH-RS400 hub and inspect it for any damage. Make sure that all parts, including the freehub body, axle, cones, and bearings, are present and in good condition.
  2. Apply Grease: Before installing the hub, apply a thin layer of grease to the hub axle and the freehub body. This will help ensure smooth rotation and reduce wear over time.
  3. Install the Freehub Body: Slide the freehub body onto the axle of the hub. Ensure it’s aligned and securely attached. You should feel it click into place once properly installed.
  4. Insert Bearings and Cones: Carefully place the bearings into the hub shell, ensuring they are seated properly in their designated positions. Then, attach the cone nuts on either side of the bearings, making sure they are threaded correctly and tightened to the manufacturer’s specifications.
  5. Position the Hub on the Frame: Once the hub is fully assembled, place the hub into the rear dropout of your bike frame. Insert the axle through the dropout and secure it with a quick release or bolt-on axle, depending on your bike’s setup.
  6. Tighten and Adjust the Hub: Use the cone wrenches to tighten the cone nuts while ensuring that the hub spins smoothly. Be cautious not to overtighten, as this could cause binding. If your bike uses a quick-release axle, make sure it is properly tightened and that the wheel is aligned.
  7. Install the Cassette: Finally, install the cassette onto the freehub body, ensuring that the lockring is properly torqued to prevent slipping.

Adjusting the Shimano FH-RS400 Hub

Proper adjustment is crucial to ensure that the Shimano FH-RS400 hub functions optimally. Here are the key adjustments to make:

Bearing Adjustment

The bearings in the Shimano FH-RS400 hub should be adjusted for minimal play while still allowing smooth rotation. Follow these steps for proper bearing adjustment:

  1. Loosen the Cone Nuts: Slightly loosen the cone nuts on both sides of the hub.
  2. Adjust the Bearings: Turn the cone nuts carefully while rotating the hub. The goal is to remove any lateral play, but not to cause the bearings to feel tight or rough. It should feel smooth with no side-to-side movement.
  3. Tighten the Cone Nuts: Once the bearings are properly adjusted, tighten the cone nuts securely with the cone wrenches. Be sure to check the hub’s rotation again to ensure it’s still smooth.

Freehub Body Adjustment

The freehub body must engage and disengage properly for smooth shifting. Ensure that the freehub body is installed and seated correctly. If it doesn’t engage smoothly, inspect for any debris, and apply a small amount of hub oil to lubricate the engagement pawls.

Maintenance of the Shimano FH-RS400 Hub

Maintaining your Shimano FH-RS400 hub will help extend its lifespan and keep your bike running at its best. Follow this maintenance routine for optimal hub performance.

Regular Cleaning

Cleaning your Shimano FH-RS400 hub is essential to prevent dirt and grime buildup, which can cause wear and poor performance. Here’s how to clean the hub:

  1. Remove the Wheel: First, remove the rear wheel from the bike.
  2. Clean the Hub Shell: Use a cleaning cloth and mild degreaser to wipe down the hub shell, removing any dirt or grease.
  3. Clean the Freehub Body: Use a cloth to clean the freehub body, ensuring there is no debris in the engagement mechanism.
  4. Check the Bearings: Periodically check the bearings for dirt or wear. If they feel rough or gritty, it may be time to replace them.

Lubrication

To keep your Shimano FH-RS400 hub performing at its peak, regular lubrication is necessary. Apply a thin layer of hub oil to the freehub body and the bearings. Be sure to wipe away any excess to prevent attracting dirt.

Inspect for Wear

Inspect the hub regularly for any signs of wear, such as:

  • Excessive play in the bearings
  • Rough or noisy freehub engagement
  • Cracks or damage to the hub shell
    If you notice any of these issues, it’s time to perform maintenance or replace parts.

Troubleshooting Common Issues with the Shimano FH-RS400 Hub

Despite its durability, the Shimano FH-RS400 hub can encounter issues during use. Here are common problems and how to troubleshoot them:

Noisy Freehub

If your freehub produces noise during coasting, this could be due to poor lubrication or debris in the engagement mechanism.

Solution: Clean the freehub body and apply a small amount of hub oil. If the issue persists, consider removing and inspecting the engagement pawls for damage or debris.

Rough or Sticky Bearings

If the hub feels rough or sticky when rotating, it’s likely due to dry or damaged bearings.

Solution: Remove the hub shell, clean the bearings, and replace them if they show signs of wear. Apply fresh grease or lubrication during reassembly.

Loose or Wobbly Hub

A loose or wobbly hub may be due to improper cone nut adjustment or worn bearings.

Solution: Check the cone nut tension and adjust as necessary. If the bearings are worn, replace them and re-adjust the cone nuts.

Conclusion

Proper installation, adjustment, and maintenance of your Shimano FH-RS400 hub are crucial for ensuring long-term performance and durability. By following the steps outlined in this guide, you can install, fine-tune, and maintain your hub with confidence. Regular cleaning, lubrication, and bearing inspections will keep your hub running smoothly and prevent premature wear. Troubleshoot common issues promptly to maintain optimal functionality and enhance your riding experience.