In reply to chris j:
> (In reply to Timmd)
> [...]
>
> Can you? Hubs are about the only thing on a mtb I've not got into servicing myself, is it difficult?
It's not difficult, you need a kind of grease which the ball bearings stick to so you don't have a nightmare putting the axle and cones back in, and also watch out for the bearings escaping to under the fridge.
You need to keep checking the adjustment when retightening the cones, by turning the axle to see how freely it turns, and if there is sideways play so it can move from side to side laterally, you want there to be no play and for it to spin freely and smoothly.
You can undo one locknut and cone and slide the axle out, and after counting the threads at the other end of the axle, remove the other nut and cone if you want to and grease the axle to stop them siezing, and after cleaning the bearing races and putting fresh grease into them and putting the same number of bearings back in, you slide in the axle and refit the nut and cone you took off to start with, and start gradually tightening the cone to see how it feels.
You have to hold the cone in position with a cone spanner and tighten the nut against it, and keep going backwards and forwards tightening and loosening them untill if feels right.
For best adjustment you can leave just a hair's bredth of play so that when the quick release is tightened up, it's removed and the bearings are able to turn as freely as possible, but that's not essential. It's something i've read about in magazines, but i'm not always sure whether i've just imagined adjusting a hub that finely or not. I think I have done, but sometimes find it difficult to tell.
It's simple really, have a go.
Cheers
Tim