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Reply to "High vibration in motor"

We have one electromotor 110kw (simense) and pump (KSB) quite similar to this problem in company, The electromotor vibration is 18mm/s in the horizontal direction (but in the vertical and axial direction about 2 mm/s.  all 4 bolts tightened vibration is high. If we loose them one by one no major change observed. But all 4 loose saw a drop in vibration. 
we checked structure, it was ok

we checked soof foot , they were ok

we checked crack on soof foot and case with PT test but they were ok

we dont know , what do we do?!!!

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