whether you're greeting brand-new bearings or replacing the grease in your existing set the tool probe portable bearing packer will make the job much quicker this tool will firmly pack bearings from 50 to 82 millimeters in diameter and can be used by either packing the container with grease by hand or using a grease gun to fill the chamber via the grease nipple firstly remove the dust cap and unscrew the top cover place the bearing in the center and reinstall the top cover if you're filling the bearing packer by hand remove the entire center of the bearing packer and fill the container with grease to approximately two-thirds full if you're using a grease gun leave the center in place and fill the container by the grease nipple once the grease begins to come through the bottom where the bearing lies you're ready to pack the bearing with the grease gun removed press down on the center handle to force new grease through the bearing not only with a portable bearing packer fill a new bearing with crus but it will also flush the old grease from your existing bearings removing the need to clean them out beforehand keep the bearing packer filled with high temperature bearing grease ready to help service your trailer at a moment's notice or wipe it clean with a rag leaving the rubber seals oil and ready to pack with a suitable grease for your next bearing job