It must be stable in service and resistant to oxidation at the temperatures to be encountered. It should retain its consistency even when contaminated with a little water. Wheel Bearing Failure Clean bearings properly. Use clean solvent and brushes and dry thoroughly with clean air. Do not pack the bearing unless it is perfectly dry.
Good practice calls for a thorough inspection after cleaning and before reinstallation.
Bearings are often hammered or pulled without respect for such precision made assemblies. Re-assembly of a damaged bearing results in short component life. Pack the bearing immediately following cleaning, drying and inspection. Do not use an excessive amount of grease - be sure it is worked into every bearing space, but do not fill the hub with grease. Keep bearings clean, work on a clean bench and do not handle bearings with dirty or moist hands.