Seals will fail to seal at some point, only a failure if this happens prematurely.
1 – Dry Running – no lubrication to seal faces causes heat build up and face wear. Faces no longer flat, seal leaks.
2 – Elastomer failure – chemical attack or heat.Elastomer no longer makes universal contact with surfaces,leak starts.
3 – Running faces not flat or contaminated. Always a drip on start-up when new. If faces are not flat or particles between faces, face no longer flat and will leak.