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Author Topic: Suburban Furnace is Screaming  (Read 265 times)

Saleengtstang

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Suburban Furnace is Screaming
« on: November 23, 2017, 11:49:33 PM »
Hey I'm new to this forum thing but it's been helpful with other issues. I have a suburban sf30-f furnace that a mouse ended up in the blower fan. It bent the shaft and the wheel on the motor so I replaced both the motor and both wheels (it was stuck in the squirrel cage looking wheel) and made sure the wheel wouldn't hit the plastic cover before putting everything back together. It started squeaking when I turned it on so I took it back apart and adjusted the wheels back in a little bit and it seemed to be great til about the fourth time it cycled on. Now it will whine for about 30 seconds after start up and once in a while it will do it just before it shuts down again. In my mind I'm thinking bearings and it'll only squeal at a lower rpm than when it's running but how likely is it that it would have bad bearings in the new motor right out of the box? I did tear it down again to look for wear marks on anything near the fans but there aren't any except from the old motor and fan. Is it possible the sail switch is bent towards the fan and hitting when it starts up? It's about the only place I can imagine it would be hitting the fan and not leave any new marks that I can see since that's metal like the fan? Thank you in advance. This thing is driving me insane trying to fix it. I

whokares2

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Re: Suburban Furnace is Screaming
« Reply #1 on: November 24, 2017, 05:28:13 AM »
Did you notice the manufacture date tag on the motor?  I put one in my RV and it was over 2 years old right out of the box!  Luckily they aren't that big of a job or expensive to change.  I just crossed off one parts supplier off my list!
1994 Fleetwood Southwind 30,000 mi.
2017 Jeep Patriot toad
Spencer and Lucky pooches.

Gary RV_Wizard

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Re: Suburban Furnace is Screaming
« Reply #2 on: November 24, 2017, 06:44:59 AM »
Quote
I put one in my RV and it was over 2 years old right out of the box!

The shelf life of a motor & fan had better be a whole lot more than two years!  Heck, you can expect it to last 10-20 years in your furnace, even if in constant use.
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

Gary RV_Wizard

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Re: Suburban Furnace is Screaming
« Reply #3 on: November 24, 2017, 06:51:55 AM »
Quote
Is it possible the sail switch is bent towards the fan and hitting when it starts up?

Is it close enough so that is possible? If so, it's worth a look.
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL