In the production of this spindle, it comes with 30g of grease, grease is injected with an automatic grease machine and set the amount. After receiving the product, it can be used without adding grease. After the product is used for a period of time, if the mechanical noise becomes louder, you can add grease, but the added grease can not exceed 30g, because the internal space of the product can only store 30g grease, if the added grease exceeds 30g, then the accessories inside the product will pop out, especially the oil seal.