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Cooler Motor noise

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Posted by I can't do that Dave on June 23, 2015, 6:07 pm
Hi All,

Neighbor called me over to look at his new swamp cooler as the motor is mak
ing a lot of noise. We took the fan belt off and the noise level didn't cha
nge at either speed. It's a loud humming droning noise that seems to be abo
ut the resonant frequency of drywall-walls as we can hear it throughout the

We mounted the entire cooler on strips of foam rubber so nothing is touchin
g any thing solid to transmit the noise. Still it persists unabated.

Is there any point in pulling the motor apart and seeing of we can make it  
hum less?

If so, what would we be looking for?


Posted by Jim Rojas on June 23, 2015, 6:28 pm
On 6/23/2015 2:07 PM, I can't do that Dave wrote:

A loose squirrel cage or worn out bearing comes to mind. I had the same  
thing happen to my central A/C blower.

Jim Rojas

Posted by ads on June 23, 2015, 6:44 pm
 On Tue, 23 Jun 2015 11:07:13 -0700 (PDT), "I can't do that Dave"

Maybe some shorted turns in the motor winding?  Not field repairable.

If so, the current drain would be higher than normal.  Do you have a
clamp-on ammeter?

Posted by I can't do that Dave on June 24, 2015, 2:32 pm
 On Tuesday, June 23, 2015 at 11:44:21 AM UTC-7, a...@wizardanswers.com wrote:

Thanks, but it is new and unlikely. Not impossible. But the clip on shows 3.15A and the spec sheet shows 6.1/3.2 for two speed motor.

Posted by Jim Rojas on June 24, 2015, 2:53 pm
 On 6/24/2015 10:32 AM, I can't do that Dave wrote:

See if there is any play on the pulleys. Also check to see if there is  
too much play on the belt. My bet is on the squirrel cage.

Jim Rojas

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