A maintenance free repetitive sealing system for a disk blade bearing hub
utilizing an integrated system of components to seal and protect the
primary bearing seal. The blade side of the spindle includes a hub
overlap portion which deflects dirt, keeps large debris out, and prevents
wrapping. A plastic seal protector keeps dirt and debris from pushing
directly into external seal lips of a multiple lip seal. The lip seal
provides positive sealing and is backed up by a grease layer barrier. The
hub overlap, plastic seal protector, and grease barrier protect the
bearing seal. The back side of the bearing hub is positively sealed with
a protected O-ring and dust cap combination. The cap combination also
protects the blade mounting hardware threads and nut.