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Old 09-24-2010, 08:59 PM   #1
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Furnace motor vibration

I just replaced my blower motor and I noticed when I look at the motor operate it has a slight vibration. The blower seems to spin true and like I said the vibration is a slight back and forth wooble. You wouldn't notice it (ie the furnace doesn't make any special noises) unless you looked at the motor when the blower was turning. My question is this vibration normal or should I be concerned?

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Old 09-25-2010, 06:16 AM   #2
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Furnace motor vibration

Its probably the blower wheel balance is slightly off.

Spinning a blower wheel by hand, doesn't match to it spinning at 900 or more RPM.

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Old 09-25-2010, 06:47 PM   #3
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Furnace motor vibration

Will the blower being slightly off damage the motor?
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Old 09-25-2010, 06:52 PM   #4
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Furnace motor vibration

Originally Posted by elou795 View Post
Will the blower being slightly off damage the motor?
yes, eventually.
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Old 11-19-2010, 08:45 PM   #5
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Furnace motor vibration

Hello everyone,

How can I stop the blower assembly vibration? I think mine is worst than the first gentleman.

When I first noticed the vibration, I went out and bought a new after-market motor, motor bracket, and blower wheel.
I installed everything brand new, but I still get the vibration, same or worst than before.

The wheel came pre-balanced (seems to me), since it has some weights attached. The motor bracket seems flimsy to me, so could be part of the problem. Attaching the motor to the squirrel cage is only three bolts. I am not really sure what to balance.

Any help would be appreciated. (By the way, the Furnace is a goodman GMS81155CNA Upflow Single Stage 80% AFUE 115,000 KBTUH Maximum CFM @ .5 ESP 2000 21 wide, Natural Gas, Initial Revision)

By the way, I am glad that I replaced all the parts, the blower wheel was extremely dirty and the motor was worse (the prior owner did not use a filter for several months).

Last edited by s0ftimage; 11-19-2010 at 09:17 PM.
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