Changzhou Giant Bearing Co., Ltd

Grease can be added to the hub through an easily accessible grease fitting located in the center of the Bearing piston.  Lubricant level can be checked by pressing on the edge of the piston.  If you can rock or move the piston, the hub is properly filled. If the piston won't rock or move, add grease until piston moves outward about 1/8 inch.  When adding grease, always use a hand grease gun.  An automatic grease gun will destroy the hub's inner seal.