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After Shaft Alignment, Back Off on Jacking Bolts to Reduce Vibration

Jacking bolts provide an easy and accurate way to horizontally position a motor during a shaft alignment. However, it they are left tight against the feet, some unexpected problems may occur.

Loosening jacking bolts before making an alignment can have significant benefits, including reducing vibration.

If your company's policy is to keep jacking bolts tight, here's a tip:

  • Mount a jam nut on the jacking bolt.
  • Use a 5 mil shim between the bolt and motor foot, run the bolt up until it lightly pinches the shim.
  • Set the jam nut, and remove the shim.

See our test results here

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