Reply to "High horizontal vibration on gearbox"

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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