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Thread: Blower Motor

  1. #1
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    Blower Motor

    This may not fit here, but I have an old furnace blower motor hooked up to move air in our pole barn. Awhile back it stopped working on initial start up. However, if I manually turn the gage then plug it in, no problem, turns and moves air nicely. Now, there is a good size capacitor on the side, is that used for initial start ups? Just wondering. Thanks
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  2. #2
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    Re: Blower Motor

    Quote Originally Posted by geezer View Post
    This may not fit here, but I have an old furnace blower motor hooked up to move air in our pole barn. Awhile back it stopped working on initial start up. However, if I manually turn the gage then plug it in, no problem, turns and moves air nicely. Now, there is a good size capacitor on the side, is that used for initial start ups? Just wondering. Thanks
    Yep, odds are that is the start cap and it's dead. To test it disconnect the leads and touch the terminals with an ohmeter set for 2K ohms, the meter should swing up then back down if it's good. No needle movement and it's dead.

  3. #3
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    Re: Blower Motor

    If it is a furnace blower motor it would be a run capacitor and would not cause the symptoms you state.
    My bet is the sleeve bearings are worn especially if lubricating it does not help.

  4. #4
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    Re: Blower Motor

    Quote Originally Posted by 12V71 View Post
    Yep, odds are that is the start cap and it's dead. To test it disconnect the leads and touch the terminals with an ohmeter set for 2K ohms, the meter should swing up then back down if it's good. No needle movement and it's dead.
    ok, will try and test soonest, much obliged.
    Geezer
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  5. #5
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    Re: Blower Motor

    i am probably wrong, but aren't u suppose to short across the capacitor to discharge first before ohming ?
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  6. #6
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    Re: Blower Motor

    Give the bearings a good shot of silicone spray and spin it around to lube it. That's worked for me on several fan motors. Oil just gets gummy until you can get it running and free up the bearings (if that's the problem and not the start cap).

  7. #7
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    Re: Blower Motor

    Quote Originally Posted by duramax-rob View Post
    i am probably wrong, but aren't u suppose to short across the capacitor to discharge first before ohming ?
    Yes for sure. You do not want a ohm meter on a charged cap for sure.

  8. #8
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    Re: Blower Motor

    My son dropped by with a couple of capacitors. The writing on the old capacitor was unreadable, too old. We put a meter on it and nothing. Actually when we placed a screwdriver across the terminals (after unplugging) no spark. So he had a couple capacitors and we put on, no soap. We replaced the old one with with a 10 and 20, no luck. Could not identify any areas to oil or grease. Conclusion, motor probably 30 years old. I will keep reaching down, turn the cage and let it run. Got another newer motor in the barn, will probably install it in the mount and use it. Thanks for all the posts..Name:  Capacitor.jpg
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    Geezer
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  10. #9
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    Re: Blower Motor

    Lookeeeee there TimmyTig , two pics in a row right side up
    Geezer
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  12. #10
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    Re: Blower Motor

    My bandsaw & sander (both Craftsman) have motors with capacitors on the outside. With the bandsaw, I get on my knees & give the 'Vee' belt a pull to get the motor spinning, & away it goes. Same with sander. They both have inside on one end, centrifical switches that cut out (?) the caps. Every few years (5-6) the points, from arcing, dont make contact anymore. Take the motor (end with switch) pull end off, file contacts, re-assemble, good for a few more years.
    The caps are there just for starting, only in the circuit a second or two.
    What is the sound of one knee jerking?

  13. #11
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    Re: Blower Motor

    Appreciate the post and info, but from henceforth I think this is an academic discussion. This afternoon my fan was struggling to run even after I moved the cage. Looks like I will have to dig out the other blower motor and hopefully it works. More later
    Geezer
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