Service A Freehub Body

Introduction

An freehub body has bearings like a front wheel and the freewheel screws onto the hub shell. You need to remove the freewheel to service the hub bearing.

Step 1

<h3>Step 1</h3><p>Take the wheel off the bike.
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Access the freehub body

Take the wheel off the bike.

Step 2

<h3>Step 2</h3><p>Hold the cone on the left side still with a cone-spanner and loosen the lock-nut. Unscrew and take off the lock-nut, washer and cone. Catch the balls if they fall out. Count them.
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Dismantle The Left Side

Hold the cone on the left side still with a cone-spanner and loosen the lock-nut. Unscrew and take off the lock-nut, washer and cone. Catch the balls if they fall out. Count them.

Step 3

<h3>Step 3</h3><p>Separate the axle from the other side of the hub and shake – or pick – out the remaining balls.
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Remove The Axle

Separate the axle from the other side of the hub and shake – or pick – out the remaining balls.

Step 4

<h3>Step 4</h3><p>Clean all the loose parts and the cups inside the hub. The cup on the drive side is part of the freehub body but you can treat it like the cup in a hub shell
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Clean

Clean all the loose parts and the cups inside the hub. The cup on the drive side is part of the freehub body but you can treat it like the cup in a hub shell

Step 5

<h3>Step 5</h3><p>Check the surfaces – on the cones and inside the freehub body shell – where the balls run, for roughness or uneven wear. Worn cones can be replaced but if a hub is worn it may need to be scrapped.
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Inspect The Bearing Surfaces

Check the surfaces – on the cones and inside the freehub body shell – where the balls run, for roughness or uneven wear. Worn cones can be replaced but if a hub is worn it may need to be scrapped.

Step 6

<h3>Step 6</h3><p>If you need to replace the cones on the freehub body, measure the position of the one still on the axle, and make sure they go back in the same place so the axle is centred in the hub. The drive side may have more spacers between the lock-nut and cone. If you’re replacing the cones you may need different sized spacers if the new cones are shorter or longer than the old ones. It may be easier to replace the whole axle if you can’t find cones that match the thread on the old axle.
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New Cones

If you need to replace the cones on the freehub body, measure the position of the one still on the axle, and make sure they go back in the same place so the axle is centred in the hub. The drive side may have more spacers between the lock-nut and cone. If you’re replacing the cones you may need different sized spacers if the new cones are shorter or longer than the old ones. It may be easier to replace the whole axle if you can’t find cones that match the thread on the old axle.

Step 7

<h3>Step 7</h3><p>Pack the races in the hub with new grease and press the same number of new balls – of exactly the same size – into the grease. Changing the balls prolongs the life of the other parts of the freehub body. If you’re not sure how many balls came out, or if you suspect that the hub was packed with the wrong number of balls, fill a race with balls and then take one out. The balls need room to roll around.
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Repack With New Balls

Pack the races in the hub with new grease and press the same number of new balls – of exactly the same size – into the grease. Changing the balls prolongs the life of the other parts of the freehub body. If you’re not sure how many balls came out, or if you suspect that the hub was packed with the wrong number of balls, fill a race with balls and then take one out. The balls need room to roll around.

Step 8

<h3>Step 8</h3><p>Check the lock-nut and cone assembly on the right side of the axle are locked tight. They won’t be accessible when they are inside the hub.
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Rebuild

Check the lock-nut and cone assembly on the right side of the axle are locked tight. They won’t be accessible when they are inside the hub.

Step 9

<h3>Step 9</h3><p>Feed the axle into the hub taking care not to disturb the balls.
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Feed the axle into the hub taking care not to disturb the balls.

Step 10

<h3>Step 10</h3><p>Assemble the other side and adjust the hub.
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Assemble the other side and adjust the hub.

Step 11

<h3>Step 11</h3><p>Remount the wheel in the bike.
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Remount the wheel in the bike.