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Boater Sam · 6th Nov 2017, 10:01 am

All AC motors hum, its a question of degree. But as you describe it, stopping VIBRATING when you load the core against the cage, it does sound like a loose lamination stack or cage problem.
Are all the bolts tight?
If it's the lams rattling, get the motor warm, 50C will do, and give it a coat of varnish on the lams. As it cools it will draw it in and tighten the core.

6th Nov 2017, 10:01 am	#4
Boater Sam Banned Join Date: Dec 2013 Location: Middlewich, Cheshire, UK. & Winter in the Philippines. Posts: 3,897	Re: Wearite motor hums All AC motors hum, its a question of degree. But as you describe it, stopping VIBRATING when you load the core against the cage, it does sound like a loose lamination stack or cage problem. Are all the bolts tight? If it's the lams rattling, get the motor warm, 50C will do, and give it a coat of varnish on the lams. As it cools it will draw it in and tighten the core.