Page 1 of 2 12 LastLast
Results 1 to 13 of 17
  1. #1
    Join Date
    Dec 2008
    Location
    Buffalo NY
    Posts
    3,078

    New cap stops bearing squeal

    I am mowing my lawn and all of the sudden I here this load squeal over the sound of the mower. I shut the mower down and here the sound coming from my neighbors condenser. I walk over and can tell its coming from the fan motor. I knock on their door and tell them to shut it down. When it shuts down the motor stops right away and does not freewheel like a good motor. They ask if I can check it out so I get some tools and check it out. Fan spins but it was stiff. So I check the cap which is a 35/5. Get 19/2 on the meter. Well it's 6 pm so I can't get a motor now so I put in a turbo 200 which I keep on the truck. I put it all back together and fire it up. It squeals a little and then starts running great! The fan stops squealing and the compressor is almost silent. I have never had a cap quiet a motor like that. I can understand the compressor being quieter but I figured the bearings were shot in the fan motor. Anyone else ever see this happen?


    Sent from my iPad using Tapatalk HD
    Join http://scopeny.org/ Shooter’s Committee on Political Education

    The world is full of sheep,try not to join the flock.

    Support the Skilled Trades, Don't DIY

  2. #2
    Join Date
    Sep 2012
    Location
    Central Florida
    Posts
    880
    Quote Originally Posted by qwerty hvac View Post
    I am mowing my lawn and all of the sudden I here this load squeal over the sound of the mower. I shut the mower down and here the sound coming from my neighbors condenser. I walk over and can tell its coming from the fan motor. I knock on their door and tell them to shut it down. When it shuts down the motor stops right away and does not freewheel like a good motor. They ask if I can check it out so I get some tools and check it out. Fan spins but it was stiff. So I check the cap which is a 35/5. Get 19/2 on the meter. Well it's 6 pm so I can't get a motor now so I put in a turbo 200 which I keep on the truck. I put it all back together and fire it up. It squeals a little and then starts running great! The fan stops squealing and the compressor is almost silent. I have never had a cap quiet a motor like that. I can understand the compressor being quieter but I figured the bearings were shot in the fan motor. Anyone else ever see this happen?


    Sent from my iPad using Tapatalk HD
    Hrmm, bad cap causing the motor move at a slower speed messing with the lubrication of the bearing maybe? Getting it back up to speed might redistributed the grease in the bearing? I'm assuming its not a sleeve bearing. You might have gotten to it before it completely ruined the bearing.

  3. #3
    Join Date
    Dec 2008
    Location
    Buffalo NY
    Posts
    3,078
    Quote Originally Posted by Elfshadow View Post
    Hrmm, bad cap causing the motor move at a slower speed messing with the lubrication of the bearing maybe? Getting it back up to speed might redistributed the grease in the bearing? I'm assuming its not a sleeve bearing. You might have gotten to it before it completely ruined the bearing.
    Maybe you are on to it. I guess no one else has ever experienced this. The motor is running great now with proper amp draw. He's going to let it go and not change the motor. This will be a good test to see how long it lasts.


    Sent from my iPad using Tapatalk HD
    Join http://scopeny.org/ Shooter’s Committee on Political Education

    The world is full of sheep,try not to join the flock.

    Support the Skilled Trades, Don't DIY

  4. #4
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,145
    Does the motor freewheel with the new cap? I'm wondering if the bad cap was creating some sort of electrical braking effect similar to the way a tool does when you lay off the trigger. If the cap was leaky I suppose it could be possible...

  5. #5
    Join Date
    May 2000
    Location
    Urbandale IA. USA
    Posts
    4,887
    If it was stiff before replacing the cap, you will be replacing the motor soon.
    .
    Those who dance, appear insane to those who do not hear the music.
    Those who believe, appear ignorant to those who do not know God.

  6. #6
    Join Date
    Sep 2003
    Posts
    1,662
    I've had Condenser Fan Motors tighten up like that and breaking them loose
    caused them to run another season.

    Kinda like a rust build up on the shaft of the motor and bearing and getting the motor up to speed
    broke it all loose.

    But that usually happens at the first startup of the season.

    I agree with CEHS and recommend at the very least the motor and blade replacement.
    before it fails and maybe does more damage

  7. #7
    Join Date
    Nov 2008
    Location
    DFW,TX
    Posts
    2,169
    Quote Originally Posted by cehs View Post
    If it was stiff before replacing the cap, you will be replacing the motor soon.
    .
    ditto

  8. #8
    Join Date
    Dec 2008
    Location
    Buffalo NY
    Posts
    3,078
    I agree it will fail. But I always find them already dead so I guess I was in the right place at the right time. Fan does freewheel nicely now. It will be tested this weekend with the temps expected. I will let you guys know when I have to replace it.


    Sent from my iPad using Tapatalk HD
    Join http://scopeny.org/ Shooter’s Committee on Political Education

    The world is full of sheep,try not to join the flock.

    Support the Skilled Trades, Don't DIY

  9. #9
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,704
    Sleeve bearings need to get up to over 80% of rated RPM to start the lubrication process. A weak cap will prevent that.

    How long the bearing will last, probably until your real busy, and can't get to it.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  10. #10
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    In addition to the lubrication issue, the motor may have been running a bit hot with the weak run cap.
    If more government is the answer, then it's a really stupid question.

  11. #11
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,825
    Quote Originally Posted by cehs View Post
    If it was stiff before replacing the cap, you will be replacing the motor soon.
    Man a neighbor? I would have just mowed the grass and went inside and turned the TV up. I can hear them now, honey the a/c dude next door was out mowing his yard, and now our a/c is making a loud noise....
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  12. #12
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,070
    you didnt oil the motor while you had it apart ??

    most have 2 plugs to remove if they are sleeve brg

  13. #13
    Join Date
    Nov 2011
    Location
    Phoenix,AZ
    Posts
    289
    I had one that was similar but I knew it wasn't gonna last and I had the motor with me so I replaced both

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image