Shimano Spares FH-MT400-B Complete Freewheel Body - SHIMANO
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Product Information
Full details
This guide is for cyclists needing to replace or repair their Shimano FH-MT400-B hub's freewheel body. The key benefit is restoring smooth drivetrain operation with a genuine Shimano part. A caveat is that proper installation requires specific tools and mechanical knowledge. This product is a complete replacement freewheel body for the Shimano FH-MT400-B hub, ensuring compatibility and reliable performance.
All features
| Model Part Number | Y3f898030 |
|---|---|
| Brand | SHIMANO |
Extended Product Information
FAQs
Is this freewheel body compatible with all Shimano hubs?
No, this freewheel body is specifically designed for the Shimano FH-MT400-B model. It is crucial to verify your hub's model number before purchasing.
What is the weight of this freewheel body?
The item package weight is approximately 100.0 grams.
Do I need special tools to install this freewheel body?
Yes, installation requires specific bicycle tools, including a freewheel body removal tool compatible with Shimano freehubs, a chain whip, and cone wrenches.
Can I service the freewheel body myself?
While replacement is possible with the right tools and knowledge, the internal mechanism of the freewheel body is not typically designed for user servicing. If you experience issues beyond replacement, it is best to consult a professional bike mechanic.
What happens if my freewheel body fails?
A failing freewheel body can result in the pedals spinning freely without engaging the rear wheel, causing a loss of propulsion. In some cases, it might also cause skipping or a noisy hub.
How do I know if I need to replace my freewheel body?
Symptoms include the chain not engaging when you pedal, the pedals spinning freely even when the bike is moving, or loud clicking noises coming from the rear hub, especially when not pedaling.
Troubleshooting
Freewheel body does not screw in smoothly.
Check that you are using the correct freewheel body for your FH-MT400-B hub and that the threads on both the body and the hub driver are clean and free from damage. Do not force it; try backing it out and re-threading.
Cassette does not fit onto the new freewheel body.
Ensure the new freewheel body is fully seated and tightened. Check that no debris is obstructing the splines on the freewheel body or the cassette.
Pedals spin freely and do not engage the wheel (after installation).
The freewheel body may not be tightened correctly, or there could be an issue with the pawl mechanism. Ensure the freewheel body is securely fastened to the hub driver. If the issue persists, consult a professional mechanic.
Difficulty removing the old freewheel body.
Ensure you are using the correct, high-quality removal tool and that it is fully engaged. Apply steady, firm pressure. If stuck, a small amount of penetrating oil might help, but avoid forcing it to prevent damage to the hub body.
Pros and Cons
Pros
- Ensures perfect compatibility with FH-MT400-B hubs.
- Restores original shifting performance and reliability.
- Genuine Shimano part for quality assurance.
- Includes all necessary components for replacement.
Cons
- Requires specialized bicycle tools for installation.
- Installation can be complex for inexperienced individuals.
- Only compatible with specific Shimano FH-MT400-B hub models.
Setup, Compatibility & Care Instructions
Compatibility: This freewheel body is specifically designed for the Shimano FH-MT400-B rear hub. Ensure your hub model matches exactly before purchase. It is not compatible with other Shimano models or different brands.
Setup & Installation:
- Tools Required: You will need a freewheel body removal tool specific to Shimano freehubs, a chain whip, and a cone wrench set.
- Wheel Removal: Remove the rear wheel from the bicycle frame.
- Cassette Removal: Use the chain whip to hold the cassette in place while unscrewing the lockring (if applicable) and sliding the cassette off the freewheel body.
- Freewheel Body Removal: Attach the appropriate freewheel body removal tool and carefully unscrew the old freewheel body from the hub's freehub driver.
- Cleaning: Clean the freehub driver body thoroughly.
- Installation: Screw the new Shimano FH-MT400-B freewheel body onto the freehub driver by hand, ensuring it threads in smoothly. Tighten it firmly using the removal tool. Note: Some freewheel bodies are reverse-threaded; check specific instructions for your model.
- Reassembly: Reinstall the cassette and lockring, then remount the wheel on the bicycle.
Care: This part is internal to the hub and generally requires no user cleaning. Its performance relies on proper lubrication within the hub mechanism. Protect the hub from excessive water and dirt ingress, which can accelerate wear on internal components. If you suspect issues, a professional bike mechanic can service the hub.