THE EMPLOYEE WAS ATTEMPTING TO LUBRICATE THE ROLLER ON THE INCLINE CONVEYOR BELT, BUT FAILED TO LOCKOUT THE SYSTEM. THE EE WAS USING HIS RT. HAND TO LUBRICATE THE BEARINGS. HIS LEFT ARM & HAND WERE RESTING ON THE TOP OF THE GUARD & EE SLIPPED CAUSING HIS LEFT HAND TO GO BETWEEN THE ROLLER & THE CONVEYOR BELT.