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Tips for test running motors with roller bearings

  • July 2006
  • Number of views: 6810
  • Article rating: 5.0

Cyndi Nyberg
Former EASA Technical Support Specialist

Editor's Note: This article is similar to a February 2010 Currents article titled "Preloading roller bearing motors for no-load run testing." These two articles complement and supplement each other.

Ball and sleeve bearing motors can always be test run without any type of external load on the motor and bearings. 

However, when repairing a motor equipped with roller bearings that is used in an application with a radial load, such as a belted load, it is not advisable to perform the standard no-load test run for any length of time. Yet the no-load test run is a crucial step in the repair process to ensure proper operation. Without that radial load, the bearings can be damaged. This article will describe two ways to put a load on the shaft of a motor and therefore the roller bearing, so that it can be test run to ensure that it has been properly repaired. 

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ANSI/EASA AR100

More information on this topic can be found in ANSI/EASA AR100
  • Section 4: Testing

EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 8: Bearings
  • Section 10: Mechanical

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 10: Bearings & Lubrication
  • Section 12: Test & Inspection Procedures

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 10: Bearings & Lubrication
  • Section 12: Test & Inspection Procedures

Mechanical Repair Fundamentals of Electric Motors
  • Section 3: Testing & Inspection Procedures
  • Section 5: Bearings

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Tags: Motor testing Roller bearings
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