Where Do I Begin? Fan Motor Squealing

Discussion in 'Electrical Forum discussion & Blog' started by xroad, Oct 25, 2008.

  1. xroad

    xroad New Member

    Messages:
    113
    Hi Folks,

    I removed the fan sub assembley from the bathroom exhaust fan unit. The mator was squealing. Easier to take the sub assembly down and replace the motor than removing and replacing the whole fan unit, which is attached to the ceiling. So, where do I begin? Who sells fan motors? The fan unit is Broan. The fan sub assembly said Nautilus. The spec on the motor + fan is stamped on the metal plate of the sub assembly: 120V, 115A, 60Hz, 70cfm, 3 sones. The motor itself have UPPCO inc. stamped on the body. The motor have a 4 inch electrical cord with a AC plug that plugs into the main assembly outlet. The motor shaft have a spline end which the plastic fan is pressed into the spline shaft.

    Thanks
    xroad
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,641
    Location:
    Cave Creek, Arizona
    motor

    If your local Grainger store sells to the public, ours do not but some apparently do, they probably have a replacement motor.
  3. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    Broan parts are available. As mentioned, a Grainger Dayton motor is probably available. Give us the model number of the fan unit, and all the numbers on the motor. I have some cross references.
  4. leejosepho

    leejosepho DIY scratch-pad engineer

    Attached Files:

  5. Alectrician

    Alectrician DIY Senior Member

    Messages:
    689
    Try WD40 first.

    Don't spray it on the running motor though as it WILL flame a bit. Don't ask me how I know this.:rolleyes:

    Spray a lot on, run the fan, clean off and repeat.
  6. Bill Arden

    Bill Arden Computer Programmer

    Messages:
    584
    Location:
    MN, USA
    I usually apply 3-1 oil first and then mix in heavier oil.

    Replacing the motor with an identical unit is will just make it last as long as the first one did.

    I did manage to replace the bushing on one motor with bearings, but that's not a simple task and I would not recommend anyone doing that due to the complexity and time involved.
  7. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,641
    Location:
    Cave Creek, Arizona
    Wd-40

    As one auto mechanic says, WD-40 stands for "washes dirt formula 40", it is not really a lubricant. Dry or liquid silicone, 3 in 1 oil, or something like that may help. But usually it is difficult or impossible to get a lubricant into the bearings to stop the noise.
  8. xroad

    xroad New Member

    Messages:
    113
    Once the motor is squealing, doesn't it mean the bearings are toast?

    Even if I get the motor apart and lube the bearings with the proper lube, wouldn't a new motor last longer than a re-lube old one?

    The engineer and the cheap ass tight wad in me tells me to tear into the motor and save it. The pratical side of me say this motor is only about $15. If I know the re-lube motor will last as long as the new, then it is worth the time and effort. If it is going to last another 12 months, and I have to do this all over again in 12 months, then I don't want to do it.

    Good logic?
  9. xroad

    xroad New Member

    Messages:
    113
    Don't know what the Broan/Nautilus unit model is. The sub assembly I took out had stamped into the metal mounting plate: 120V, 1.15A, 60Hz, 70cfm, 3 sones.

    There are 6 numbers on the paper that wraps around the motor wire core windings .....

    Model#: 85T (the number is fuzzy, possibly 05T)
    T.P. : "L" (I don't know what this number means)
    120V
    60Hz
    1.3A
    99080285 (possibly 99000285, I think it's a Broan OEM part number, many of their motor number is 99080### in their assembly diagram)

    Raised letters on the motor's metal shaft cap: UPPCO inc.

    The drive shaft is 1-19/32" long.
    The spline at the end is 18/32" long.
    The shaft diameter is 7/32".
    The spline diameter is 6/32".
    Mounting screw distance ... did not measure. They're all the same right?

    Motor looks ALMOST like the ACE Hardware one posted by leejosepho. Propeller is different. It's press fit, I can pull it off.

    jimbo, if you can please help me with your cross reference ... MUCH THANKS.
    Last edited: Oct 26, 2008
  10. jbfan74

    jbfan74 Electrical Contractor

    Messages:
    131
    Location:
    Newnan, GA
    Sometime it is cheaper to buy the exact fan and remove the motor.
  11. xroad

    xroad New Member

    Messages:
    113
    I thought about that. No idea what the Broan model is. It was installed at my mother's house a while ago. Can't figure out how it was mounted inside that ceiling. No visible screws from the room side. Not thrill about crawling into the attic craw space to look. Maybe I can open a few boxes at Home Depot or Lowes and see if the guts match.
  12. Thatguy

    Thatguy Homeowner

    Messages:
    1,459
    Location:
    MD
    WD = Water Displacement

    BTW, if they priced the replacement motor correctly it should be half the price of a replacement fan. The idea is to put you on the fence as to whether to buy new or repair. "They" want to you to buy new.
    In this case, though, the motor is probably most of the cost of a fan.
    Last edited: Oct 26, 2008
  13. Alectrician

    Alectrician DIY Senior Member

    Messages:
    689
    Sometimes replacement parts are hard/time consuming to locate.


    WD40, oil and move on to more important issues. As long as it is still spinning, it's still working.
  14. beekerc

    beekerc IT Consultant / Network Engineer

    Messages:
    94
    Location:
    Seattle
    check out http://parts.broan-nutone.com/broan/Shop?Dsp=30000&PCR=1:2000
    once you find your model number, or the picture of the unit that looks just like it, you will be taken to a page that shows an exploded parts diagram of the unit and you can order the part(s) that you need. if you're not 100% sure, call 800-558-1711 and you can talk with a very knowledgeable the parts desk rep and they can help you out.

    I've used this service many times. one of the main reasons i keep buying broan/nutone products.
  15. Thatguy

    Thatguy Homeowner

    Messages:
    1,459
    Location:
    MD
    I was just at HD.
    Bathroom fan, $13.
    Insides for same fan (motor+plate), $14.
    Fan motor from Hosfelt.com

    120 VAC Fan Motor $US 2.49 [​IMG][​IMG][​IMG] Mfg. - OH SUNG
    Mfg. # - F960112-2
    2-7/8" x 1-1/2" x 2-1/2"
    3/4" shaft
    120V, 60Hz

    This impedance protected fan motor is most
    commonly used in refridgerators, vent fans,
    battery chargers, amplifiers etc.
    35-162

    Supply and demand is alive and well.
  16. xroad

    xroad New Member

    Messages:
    113
    Can I use a pancake fans commonly found in computer and electronic equipments? My work place throws away tons of old equipment and I can pry one of those fan off. All I need is to fab some mounting bracket onto the original plate from the fan unit. What are the typical computer fan cfm rating? Around 70 cfm I hope.
  17. beekerc

    beekerc IT Consultant / Network Engineer

    Messages:
    94
    Location:
    Seattle
    fan replacement

    you very possibly could, however, if it were me, i'd order the replacement part directly from nutone/broan. failing that, my next option would probably be to find the same fan on **** or craigslist (with the usualy buyer beware precautions, etc.) and cannibalize it for the parts you need.
  18. leejosepho

    leejosepho DIY scratch-pad engineer

    Even though that type of fan comes in various sizes, capacities and voltages, the typical fan from a computer's power supply or cabinet is not likely to have anywhere near that CFM and will likely need 12 VDC.
  19. xroad

    xroad New Member

    Messages:
    113
    model N671-H

    Yes, I just looked up some of the spec on these computer fans. You're right. cfm is very low.

    Found another number on the fan sub assembly, stamped on the mounting plate ... model N671-H

    The motor:

    Model#: 85T (the number is fuzzy, possibly 05T)
    T.P. : "L" (I don't know what this number means)
    120V
    60Hz
    1.3A
    99080285 (possibly 99000285, I think it's a Broan OEM part number, many of their motor number is 99080### in their assembly diagram)
  20. Thatguy

    Thatguy Homeowner

    Messages:
    1,459
    Location:
    MD
    The fan above uses 1.15A for 70 cfm so this one must be slightly more than 70. The noise level probably depends on the propeller design.
Similar Threads: Where Begin
Forum Title Date
Electrical Forum discussion & Blog Oh where, oh where does that circuit go? Jan 16, 2013
Electrical Forum discussion & Blog Where in the World is Mike ? Jul 14, 2011
Electrical Forum discussion & Blog 220 V well timer. Where can I find one? Jan 26, 2010
Electrical Forum discussion & Blog Thermostat - Where to insert wires? Dec 23, 2009
Electrical Forum discussion & Blog Where should doorbell transformers be mounted Nov 16, 2009

Share This Page