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FEIN REPAIR TOOLS
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7.2. Service life of carbon and spherical needle bearings
Carbon (180):
The service life of the carbon is about 150 operating hours.
Run in new carbon brushes at lowest speed without applying load.
Spherical needle bearing (500):
The spherical needle bearing has a service life of about 300 operating hours
and should be replaced at the same time as the second carbon replacement.
Run in for about 20 minutes at lowest speed without applying load.
The spherical needle bearing is supplied lubricated with a special grease and
need not be re-greased!