Rear Hub Bearing Service
Tools Needed
- OneUp hub drift kit or standard drift kit with 6902 drifts.
- Mallet
- Waterproof Grease (PL-1000 or better)
- Freehub grease (supplied with hub)
- Lint free cloths
- 25 Torx key
- Cassette tool w/o axle guide
- Vice
Please note: If you do not have access to a vice, you still can complete this service. Just note that both hammering out & pressing in the bearings will be less controlled without the vice.
COMPLETE REAR HUB EXPLODED VIEW & PARTS LIST
COMPLETE FREEHUB EXPLODED VIEW & PARTS LIST
Preparation:
Using your T25 torx key, remove all 6 brake rotor bolts. You can then set the brake rotor & bolts aside until you have completed this service.
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 & rachet 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: Lockring Removal
Flip the wheel over. Using your cassette tool, unthread the lockring. Clean it and set it aside for assembly.
Step 4: Non drive side bearing removal
Place the base from the drift kit (part 3/4) into your vice. Tighten the vice onto the flats of that base.
Now you can place the wheel onto the base, non drive side down. Place the axle drift (part 4/4) into the drive side axle.
Using your hammer against the axle drift, punch the non drive side bearing out of the hub shell. Remember to do this slow and ensure the axle & bearing are exiting the hub shell as straight as possible.
Step 5: Drive side bearing removal
Remove the non drive side bearing from the axle and recycle it. Take the axle and push it through the drive side bearing until the lip on the axle bottoms out on the inner race of the bearing. Place the axle drift (part 4/4) into the end of the axle. Keeping the axle centered and straight, punch the drive side bearing out of the hub shell with your hammer.
IMPORTANT: Both bearings push out through the non drive side. When you push out the drive side bearing, take note that you will first push it out of the drive side bearing seat, the bearing will then loosen up before needing to be pushed through the non-drive side bearing seat. Ensure that you keep the bearing & axle straight through this process to avoid damaging the non-drive side bearing seat.
Step 6: Clean & Grease
Now that both bearings are removed, go ahead and thoroughly clean the inside of the hub shell. Apply a thin layer of grease on the bearing seats within the hub shell (the non-anodized sections).
Step 7: Drive side Bearing Install
Flip the wheel over on the base (part 3/4) so that the drive side is down. You will set the drive side bearing first. Apply a thin layer of grease to the bearing and place the bearing into the non drive side of the hub shell.
Please note: The grey bearing seal should face outward on both sides once the bearing are seated in the hub.
Place the Guide (part 2/4) into the non drive side of the hub, then place the bearing drift (Part 3/4) into that guide, on top of the bearing.
You can now slide the axle into the bearing drift (arrow on the axle pointing up towards the non drive side). Place the axle drift into the top of the axle.
Keeping the axle and bearing centered, hammer the bearing past the non drive side bearing seat. The axle & bearing will loosen up once it is past the bearing seat and drop to the edge of the drive side bearing seat.
Once again ensuring your bearing and axle is nicely centered, hammer it into the drive side bearing seat. Check that the bearing is straight and fully seated against the ratchet interface on the drive side.
Step 8: Non drive side bearing
Place the non drive side bearing onto the non drive side of the axle until it contacts the lip. With the drive side arrow on the axle pointing down towards the drive side of the hub shell, slide the axle into the hub and through the drive side bearing until the non-drive side bearing is sitting in the hub shell. Ensure the gray seal is facing up so that it is exposed once the bearing is installed.
Place the guide (part 2/4) and the bearing drift (part 1/4) into the hub shell and on top of the bearing. Hammer the top of the bearing drift until the bearing seats fully into the hub and firmly against the lip of the axle.
You can test that the bearing is properly in place by pulling back and forth on the axle. There should be no knocking play between the bearings and the axle.
Step 9: Tighten lockring
Using your cassette tool, tighten the locking to 10Nm.
Tip: Spinning the lockring backwards until it catches and drops into the start of the threads in the hub shell will help align it.
At this point it is recommended to check the rotation of the axle. If it feels stiff or if there is a slight notch, the bearing races likely need a slight adjustment. Give the axle ends a light tap with the hammer, this will correct the positioning of the bearing races and smooth out rotation. If the axle can pull side to side, then you may need to check that the bearings are fully seated and the lockring is torqued accordingly.
Step 10: Install non drive side end cap
Lightly grease the outside of the non-drive side bearing & the inside of the seal on the end cap. Push the non drive side end cap back onto the non drive side axle.
Step 11: Grease ratchet assembly
Apply a fresh layer of freehub grease or oil to your ratchets, the ratchet interfaces, the spacer and the spring.
The maximum amount of freehub grease is 2.5ml (half of the supplied Grease packet). Excess freehub grease can cause poor engagement and potentially damage the rachet teeth.
Note: 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 12: 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. You can now also push the drive side end cap onto the axle.
Congratulations, you have completed the OneUp rear hub bearing 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
