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Air compressor theory

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joe b

04-30-2002 10:30:04




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I just brought a used air compressor a oil type. I pluged it in and guess what i just hear the electric motor humming. Does anyone known of a web page about theory of operation. I am going to try to fix it. It can be hooked up to 110 or 220 it looks to me it was 110 by just having a black and white wire come out of the conduit. Any other ideas would help thanks




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Bill

05-04-2002 00:38:30




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 Re: air compressor theory in reply to joe b, 04-30-2002 10:30:04  
I would agree with all the other responses for things to look for. One more thing to look for- Many motors have a start circuit that helps them start. As they come up to speed a centrifically activated mechanical breaks the contacts on the start circuit. If the motor has been setting contacts get dirty. After a few sucessful start stops they will usually free up. Sometimes they need a good old cleaning. On most compressors you can turn them by hand to get them to start. Most motors especially those on water pumps that are made to direct couple ( you can't get to the drive end to turn it especially frustrating on a water pump that has set & rusted..) you look on the rear of the motor & there will be a cap that can be taken off. Inside you see the end of the motor shaft with a screw driver slot in it. give'er a spin with a screw driver drill & see what happens.. Can't tell you how many stuck pumps I've brought home from the landfill & had running in a matter of minutes....

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Jerry Aspinall

05-01-2002 13:51:24




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 Re: air compressor theory in reply to joe b, 04-30-2002 10:30:04  
I bought a compressor that came out of a gas station and it had set outside for some time. It did the same thing. It had a capassator start motor and the capassors were out. I replaced them for about $30:00 and its run fine ever since. This may be your trouble. Jerry in Ca.



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Robert Welch

05-01-2002 16:34:15




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 Re: Re: air compressor theory in reply to Jerry Aspinall, 05-01-2002 13:51:24  
Well eyes bought um compressor that hummed two. Ater a few weaks of teachen it to sing now it blows lots of error!



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Neil

05-01-2002 06:08:01




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 Re: air compressor theory in reply to joe b, 04-30-2002 10:30:04  
Don't guess. Open up the junction box on the motor and check how it is wired. Lots of people use white and black for 220 (not right but common).

Start with the wiring.
Them run the motor with the belt off.
Then check that the pump turns by hand and pumps some air.
Then check the tank for obvoius problems, rust, bad or no safty release, etc.
Then put the belt on and see how it runs.
Watch the pressure with a known good guage and make sure the pressure switch is working.

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joe

05-01-2002 07:14:56




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 Re: Re: air compressor theory in reply to Neil, 05-01-2002 06:08:01  
How do you determine if it is wired for 220? And this design has no belt like my potable. It is a shop design



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Neil

05-01-2002 11:02:03




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 Re: Re: Re: air compressor theory in reply to joe, 05-01-2002 07:14:56  
There is usually a diagram on or inside the junction box.
If not you may have to ask a motor shop for some help.
I did a search a while back and found some information on the web that helped me figure out an unlabled motor, but don't recall where I found the info. Try a machine tool discussion board.
If it is a one piece design, then try to find some way to turn it by hand (with the power off) just to make sure nothing is bound up or broken.

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PCC-AL

04-30-2002 18:28:54




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 Re: air compressor theory in reply to joe b, 04-30-2002 10:30:04  
Hi joe,
I went thru the same situation. Don't know if my former problems will help solve yours, but hope so.
I bought my compressor at a sale and it had a motor that would run on 110 or 220. Just change the connections inside the motor. My electrical knowledge is limited so when things get complicated, I look for help. Anyhoo, my shop was about 150 ft from the power box and everything (then) was 110 volts. The compressor had been used formerly on 220 so I had the wire connections changed to make the motor run on 110. Hauled the dog gone thing 60 miles to the electric shop. Plugged her in and the motor hummed and barely turned. Finally found out that the problem was low voltage as the shop was so far from the power box. Changed the motor back to 220, re-wired specially for the compressor and it runs like a top. If you are a long way from your breaker box, you may have low voltage. Hope this helps.

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joe

05-01-2002 05:25:03




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 Re: Re: air compressor theory in reply to PCC-AL, 04-30-2002 18:28:54  
How do I known this without moving the beast? any ideas?



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Greaseman

05-16-2002 15:29:42




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 Re: Re: Re: air compressor theory in reply to joe, 05-01-2002 05:25:03  
Just be VEERRRRYYYY careful when moving the belt around on the pulley as it can reach out and bite you but good. Last year my Father lost part of his left thumb doing on a Davis Bradley sikle bar walk behind mower, my co-worker did his two years ago with a snowblower belt pulley and my Brother did his with a chain and sprocket on his Motorcycle.Luck.



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