Hi Gary and other persons.
Yes, the impact of the wind is big due to the rocketing effect of the fan during wind.
This has an impact on the outgoing bearing. The high speed pinion is on the motor side and should not be affected by the wind.
To withstand the forces due to the wind we always specify an extra heavy bearing on the outgoing shaft, service factor 2.5 or higher.
we recently invstigated a failure of the high speed pinion.
It appeared to be a lubrication problem. The oil level should be just halfway if by some reasons this is not the case, the bearing overheats and get damaged.
the result of this case was a complete failure of the gear box.