The sealing lip face should be lightly greased prior to installation, but no grease should be applied between the lip and case. A shaft finish of Ra 4 µm (160 µin.) is sufficient.
A lead-in chamfer should be provided. No splines or keyways are allowed.
Counterface surfaces for MVR seals should be prepared the same way as for V-rings. Avoid aluminium or soft metals in applications where there will be abrasive contaminants. Sharp peaks on turned surfaces should be removed.