MECHANICAL LOOSENESS

MECHANICAL LOOSENESS (A)

  • Caused by structural looseness of machine feet
  • Distortion of the base will cause “soft foot” problems
  • Phase analysis will reveal aprox 1800 phase shift in the vertical direction between the baseplate components of the machine

MECHANICAL LOOSENESS (B)

  • Caused by loose pillowblock bolts
  • Can cause 0.5, 1, 2 and 3X RPM
  • Sometimes caused by cracked frame structure or bearing block

MECHANICAL LOOSENESS (C)

  • Phase is often unstable
  • Will have many harmonics
  • Can be caused by a loose bearing liner, excessive bearing clearance or a loose impeller on a shaft
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