Bicycle Mechanics - re-pack sealed hubs?
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09-08-11, 07:15 PM
Hey all, I have to admit, I don't know that much about hubs. Do people re-pack sealed hubs? Like I would a regular mtb hub, or not? And if so, is it a big pain? Thanks
No, you don't re-pack sealed hubs. I am assuming intact bearing hubs as opposed to Shimano loose ball bearing hubs here. Once the sealed bearings are shot (roughness in turning the axle), then they need to be replaced.
09-08-11, 07:38 PM
How can I tell if they are sealed? It is on an olderr scott mtb. The rear says shimano sealed but it says nothing on the front. Like a label is missing? there is play and it needs to be tightend. is it possible to tighten them or are they shot?
09-08-11, 07:50 PM
"Sealed Bearings" can refer to one of two things:
1. The bearings are regular loose balls between a pressed-in cup in the hub and a cone on the axle, or
2. The bearings are cartridges, that is, they are a sealed unit that includes the bearings, an inner race (that is pressed into the hub), an outer race (that rides on the axle), and a rubber or metal seal on each side of the cartridge. These variety of bearings are replaces as a unit and generally aren't worth repacking with grease.
With that said, you will have to check the hubs by removing the locknut, any spacers, and the cone from axle in order to determine which type of "sealed bearings" they are.
As far as I know, Shimano has never utilized cartridge bearings in any of its stock hubs, so you can be fairly sure that they are not the latter type of "sealed bearing". However, it is certainly worth a look. As for the front hub, you will definitely need to pull off the axle hardware to be sure, as it could be either type. Good luck!
As Iverhagen pointed out, Shimano has never used cartridge bearings in any of their hubs. The rear hub you have is definitely a loose ball bearing hub. The front hub, well, I don't have enough info to say what kind.
Can you post a picture, as that can help in identifying your hub?
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