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