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Joined: Sep 2015
Posts: 5
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OP
Joined: Sep 2015
Posts: 5 |
Hello,
I have a 1/4 hp rocking piston compressor that won't start unless I rock it side to side or give it a little bump. It only takes one little bump and it starts every time but it won't start without it no matter how long I wait. When I give it power it just hums softly. Just curious if anyone has ran across this or has any ideas on how to fix it the pump. It is less than one years old. Thanks!
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Joined: May 2012
Posts: 1,358 Likes: 4
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Joined: May 2012
Posts: 1,358 Likes: 4 |
I bet Tony (sprkplug) knows how to fix this. Give him a private message if he doesn't see this soon.
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Joined: Jun 2008
Posts: 6,980 Likes: 15
Ambassador Lunker
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Ambassador Lunker
Joined: Jun 2008
Posts: 6,980 Likes: 15 |
Does it utilize a start capacitor?
"Forget pounds and ounces, I'm figuring displacement!"
If we accept that: MBG(+)FGSF(=)HBG(F1) And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1) Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT? PB answer: It depends.
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Joined: Sep 2015
Posts: 5
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OP
Joined: Sep 2015
Posts: 5 |
Yes, it is clipped to the side.
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Joined: Jun 2008
Posts: 6,980 Likes: 15
Ambassador Lunker
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Ambassador Lunker
Joined: Jun 2008
Posts: 6,980 Likes: 15 |
The cap is a possible culprit, if the compressor turns free by hand with no binding whatsoever. You can check the cap if you have a meter with capacitance function, or swap it out for one known to be good.
"Forget pounds and ounces, I'm figuring displacement!"
If we accept that: MBG(+)FGSF(=)HBG(F1) And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1) Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT? PB answer: It depends.
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Joined: Sep 2015
Posts: 5
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OP
Joined: Sep 2015
Posts: 5 |
Thanks! I checked the capacitor (didn't know what it was for), is labeled 30uF and I am getting a reading of 150 uF. I will order a new one and try that. Will let you know if it fixes the problem. Thanks again!
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Joined: Jun 2012
Posts: 2,058 Likes: 7
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Joined: Jun 2012
Posts: 2,058 Likes: 7 |
Most of the time the start cap will be leaking goo if they are bad or gone. Most all I have replaced do.
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Joined: Oct 2013
Posts: 6,088 Likes: 96
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Joined: Oct 2013
Posts: 6,088 Likes: 96 |
That is a weird reading. A 30 micro Farad capacitor would normally loose capacitance if it has failed. To gain capacitance............... don't know about that one.
Could there be another zero on that 30 that has faded out where it is hard to read?
John
I subscribe to Pond Boss Magazine
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Joined: May 2014
Posts: 148 Likes: 1
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Joined: May 2014
Posts: 148 Likes: 1 |
I too bet that is it as well. They will also normally "swell" up when they go bad. The ends might be bulged out. Cheap once can be had around here at an HVAC parts house. Dave C
Last edited by Custom 68; 08/31/16 03:06 PM.
Thanks Dave 1 acre pond.
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Joined: Jun 2012
Posts: 2,058 Likes: 7
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Joined: Jun 2012
Posts: 2,058 Likes: 7 |
Don't smell them if you touch the end with your nose and the cap discharges you will know it.
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Joined: Sep 2014
Posts: 1,596 Likes: 28
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Joined: Sep 2014
Posts: 1,596 Likes: 28 |
Dono...And you know this how??
Dear Alcohol, We had a deal where you would make me funnier, smarter, and a better dancer... I saw the video... We need to talk.
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Joined: Sep 2015
Posts: 5
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OP
Joined: Sep 2015
Posts: 5 |
Thanks all, it was the capacitor at fault. Replaced it and it's working good. Thanks again for the helpful advice!
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