HOW MUCH GREASE PURGE OUT OF THE SEAL IS OK AND WHEN DOES IT INDICATE A WHEEL-END PROBLEM?
A small amount of grease purge is normal during operation. Small uniform beads of grease around the outside of the seal face are considered normal. DO NOT wipe these beads off. They serve as extra contaminant protection. If the grease purge has migrated past the seal flange, this is considered excessive. If excessive leakage has occurred, the wheel-end should be inspected and the seal replaced.
