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               Originally Posted by 
               dazmatic 
                
               
             
              General rule of thumb... when packing any bearing with grease... 2/3rds full. Gives plenty of lube with space to expand when it gets warm.
                
               That includes all radial ball, angular contact ball, roller, angular contact roller and needle bearings too I believe.
               
                Just for those who didn't know 
                
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         1/3rd is enough. Manufacturer's recommendation. I have changed my bearings after 2 years. Lower one was gone. Black and rusty. Unbelievable.