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We have a I.D fan driven by a motor of 2600 kw. Changed its impeller with new bearings and plummer blocks. Before fixing the bearings and plummer blocks, impeller (10 ton weight) was balanced at G 1 (highly precised balancing). Laser alignment carried out and the readings are well within limits. After fixing the assembly we are facing high vibrations from fan side within 15 min of start up. Motor side vibrations are very less (2.0 mm/sec). Kindly advice. Fan is provided by M/s. Reitz GMBH.