Rear Hub Seal Service
Tool Needed
- Mallet
- Lint free cloths
- Small flat head or pick tool
- Vice (optional)
- waterproof Grease recommended (PL-1000 or better)
- OneUp drift kit
Note: In leau of the OneUp Drift kit, You can complete this service with a Standard 6902 drift & a flat surface with a 12mm hole for the axle.
COMPLETE EXPLODED VIEW & PARTS LIST
STEP 1: REMOVE END CAPS
Remove end caps by hand, clean them, and set them aside. They are specific to their respective sides so take note for assembly.
STEP 2: FREEHUB & RATCHET REMOVAL
Holding the wheel flat with the non drive side down, remove the freehub body by hand. Clean it and set it aside.
You can now remove the springs, the spacer, and the ratchets by hand. The inside ratchet will come up when you pull on the black spacer. Clean all the pieces and set them aside. Please note the order of these parts for reassembly. The spacer has a lip that sits against the bearing in the hub shell.
STEP 3: REMOVE FREEHUB SEAL
Place the drift kit base (part 3/4) into the vice. Place the hub non drive side down onto the drift kit base (part 3/4). Position your small flat head/pick tool underneath the inside edge of the freehub seal. Carefully pry the seal out of the hub shell. Ideally it will "pop" out completely with one pry. If the prying action in one spot only partially lifts the seal, carefully work the flat head/pick tool around the seal until it is free from the hub shell.
STEP 4: CLEAN HUB SHELL
Once the old freehub seal is removed, you can dispose of it, it is single use. Using your cloth, clean the hub shell around where the seal was.
STEP 5: POSITION FREEHUB SEAL
Grab your new freehub seal and place it as centered and evenly as possible into its seat on the hub shell. by hand or using the base (part 3/4) press the seal slightly into the hub shell.
Once the seal is held in place in the hub, you can then flip the wheel place it seal down onto the base.
STEP 6: INSTALL FREEHUB SEAL
With the freehub seal in place and the hub placed onto the base (part 3/4), place the axle drift into the top of the axle.
Alternatively: You can use the bearing drift (part 1/4) or a standard 6902 bearing drift and place it against the lockring.
Using your hammer, lightly tap the top of the axle drift until the seal is fully seated into the hub shell.
STEP 7: CHECK SEAL
Flip the hub over and check that the seal is fully & evenly seated. Sight the hub & seal at an angle (as pictured below) to ensure the seal is not sitting proud of the hub flange. If you can see a metal edge, place it back on the base and give it another tap with the hammer.
STEP 8: GREASE SEAL
Lightly grease the rubber of the freehub seal with a waterproof grease.
STEP 9: GREASE RATCHET ASSEMBLY
Apply a fresh layer of freehub grease or oil to your ratchets, the ratchet interfaces, the spacer and the spring.
Note: The more oil/grease you use the quieter the hub will be when freewheeling. It is not recommended to grease excessively or not at all. Ideally everything within the freehub assembly has a thin layer of grease or oil on it.
STEP 10: INSTALL FREEHUB ASSEMBLY
Slide the spacer onto the axle, then the ratchets, then the spring, then the freehub. Ensure they all mesh nicely together as you press it into place by hand.
Note: Setting the seal first ensures an even & centered fit. You can also simply place the seal rubber side down onto the base then place the hub on top of the seal.
STEP 11: REPLACE ENDCAP O-RINGS
There are O-rings inside both end caps. Using your small flat head/pick tool, carefully pick these O-rings from their grooves withing the endcaps. Lightly grease the new O-rings with waterproof grease. By hand fit them into the grooves within the end caps.
STEP 12: REPLACE HUB SEAL
Note the orientation of the seal before removing it. By hand pull off the old non drive side end cap hub seal. Lightly grease the entirety of the new hub seal and fit it onto the end cap by hand in the same orientation as the one you removed. Add some extra grease on the seal.
STEP 13: INSTALL END CAPS
With all the seals now replaced and greased, you can press them back onto the hub axle.
Congratulations, you have completed the OneUp rear hub Seal service.
You can now reinstall the Brake rotor and cassette (if removed) and fire that wheel back on your bike!
If you are having any problems please first double check that you have correctly completed each of the above steps.
If you are still having trouble please email us at support@oneupcomponents.com for help. Please include a detailed description of your issue. Photos are helpful.
Thanks,
OneUp
