Flushes Out Old Grease and Repacks Bearings with Less Mess. This Handy Packer works on bearings up to 3 1/2" O.D. The bearing packing tool measures 4.5 inches (11.5cm) tall and 4.3 inches (11cm) in diameter. To pack a bearing, put 1 to 2 inches of new grease in the bottom of the container, install the big piston, and place the bearing on the piston. The grease stays in the tool cavity, not on your hands. Press down on the white handle until old grease pushes out, filling your bearing with new grease. Use the green cap to protect new grease from contaminants when not in use.
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If you have done it the "old" way, you will not believe how clean and fast this method works. You don't even need to clean out the old bearing grease beforehand. Just wipe the excess old grease off the bearing, and this tool will force the remaining old grease out while "pressing" in the new grease.
Finish up by wiping grease by hand to the outside of the roller bearings.