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@A_EF
Cone nuts / lock nuts loose. Maybe. Depends what hub it is.
Bearings might need servicing / regreasing.
All easy when you know how.
Difficult to give advice without knowing what hubs / bearings (sealed?) you have.
http://www.parktool.com/repair/readhowto.asp?id=105
http://sheldonbrown.com/gloss_ba-n.html#bearing