i have a dynamic separator fan in cement mill area. a motor, gearbox and a fan. gearbox has 2 shafts. i m facing 1x horizontal high vibration 8.5mm/sec and 8mm/sec on shaft 2 DE and NDE side. All other points showing less than 1mm/sec including Motor. 

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I see some impacting going on so I would suggest as a 1st step examine the condition of the teeth.  Usually you don't have to disassemble the gearbox but you may have to do some searching to find a means of inspection.  That might be a small plate bolted to the casing or in some instances I have even seen relatively large pipe plugs that when removed permit viewing the active contact area.  

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