Tool Box Talk - Lubricating an Electric Motor

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Lubricating an electric motor correctly is key insuring you receive maximum life from your motors. One can purchase the best motors money can buy, use Laser Alignment, and all the things one must do to optimize motor life and it will fail is electric motors are lubricated incorrectly.

This Tool Box Talk helps one educate your maintenance team in known best maintenance practices. Check it out, it may save stop help stop premature motor failures in your organization.

Use this Tool Box Talk before your begin a Preventive Maintenance Optimization process.

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Tool Box Talk - Lubricating an Electric Motor

  1. 1. Lubricating an Electric Motor “TOOL BOX TRAINING” Instructor: Maintenance Supervisor If you would like any back issues of Tool Box Training Series send an email to rsmith@gpallied.com www.gpallied.com Copyright 2010 GPAllied 4360 Corporate Road Suite 110 Charleston, SC 29405 Office (843) 414-5760 Fax (843) 414-5779 General Rules - Always follow lubrication procedure provided - If an electric motor is not lasting more than 8-10 years read my next Tool Box Training Session and make something happen - Anyone lubricating a motor should be qualified to use the grease gun. This process requires a procedure to be written with specifications and ensure the person follows the procedure General Issues Most companies experience motor bearing failure however and are not sure why the bearing failed. Three of the reasons we will consider in this in this Tool Box Training Session are: 1. Lack of Lubrication 2. Over-lubrication (grease enters motor windings or pushes out seal contaminating the bearing) 3. Contamination Steps to Successful Motor Bearing Lubrication By Matt Spurlock MLA III, MLT, LLA 1. WARNING: Motor needs to be operating while lubricating if at all possible otherwise the grease will not transfer around the bearing as required. 2. Ensure you have a manual grease gun with the appropriate grease type for electric motor. NOTE: If using an ultrasound grease gun add these steps to the Ultrasound Gun Procedure. 3. Inspect electric motor for visual defects (i.e. seals leakage, excessive build up in fins, grease fitting damage, etc.) 4. Remove grease relief plugs 5. Wipe off any debris or excess grease from zerk fitting and end of grease gun 6. Attach grease gun to appropriate zerk fitting 7. SLOWLY apply grease paying attention to any excessive back pressure on the grease gun a. If back pressure is felt, this could indicate the presence of hardened grease in the lines/tubes that should be cleaned out 8. Grease should be applied only to a volume that has been pre-determined either through OEM or calculated volumes. This information should be listed on your lubrication check sheet 9. If fresh grease is seen being expelled from relief port, discontinue application 10. Allow motor to run a minimum of 15 minutes prior to replacing relief plugs 11. Replace grease cap or put a small amount of grease on zerk fitting to help with contamination control Next Tool Box Session: Why Electric Motors Fail? Send me the estimated life of your current electric motors between 5-50 HP at rsmith@gpallied.com
  2. 2. Lubricating an Electric Motor “TOOL BOX TRAINING” Instructor: Maintenance Supervisor If you would like any back issues of Tool Box Training Series send an email to rsmith@gpallied.com www.gpallied.com Copyright 2010 GPAllied 4360 Corporate Road Suite 110 Charleston, SC 29405 Office (843) 414-5760 Fax (843) 414-5779

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