theoperatingmicroscopeinoil:watercan notentertheimpurities,notemulsifiedorblack.operatingmicroscope indifferenttone: in particular,therolling bearing,thedamagewill usually beabnormalsound.Oil temperature: Do notexceed 60 ℃.bitoperatingmicroscope inoil:Theoil ringbearings,oil levelshould not belessthantheballcenter;oilringbearings,oil levelshould be able toburyBaptistfifthofthediameteroftheoil ring.operatingmicroscope inorder to monitor theoil levelonthebearingwithoil leveloroil standard.