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05/02/2016

Safety Tip: Identification of a leaking seal vs. non-leaking seal

A small amount of visible lubricant seepage on the backside of STEMCO seals is considered normal and acceptable. We often see this in new seals that we test every day. This is not unusual, and it does not mean that the seal is leaking. This seepage is most likely a result of grease pre-lube escaping from a newly installed seal. Our factory places this grease pre-lube into the seal upon assembly to reduce the frictional heat generation upon seal “run-in”. If the visible seepage extends well out onto the hub and is quite damp, then the seal may be leaking and should be replaced at the first opportunity.

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