air compresser
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Freshman User
Joined: Feb 2004
Posts: 29
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From: Ohio
air compresser
I have a question regarding air compressers.I got a coleman A\c for xmas a couple of years ago its a small one with a 5 hp motor and a 22 gallon tank. I havnt used it much at all maybe 15 or 20 times but the last time I used it I turned it on and it filled the tank and shut off like its supposed to then i pumped the tires up with it but when it started to kick back on it sounded like it tried to kick on but couldnt it just sat there and made a buzzing sound I think its fried its the oiless type I think. Can it be fixed or should I get another type of compresser I wouldnt need a huge one but I would like a dependable one any suggestions? 
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
There is a check valve and head pressure release valve that may not be functioning. The pressure switch with the wires leading to the plug and the motor may have a lever on it to relese the head pressure. You may find more info in your owners manual.
The motor will not start with full pressure on the piston.
The motor will not start with full pressure on the piston.
Elder User
Joined: May 2003
Posts: 609
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From: Garland Tx
My air compressor did that when we were using the nailgun when it didnt have enough juice from the plug. We found that we couldnt have anything else on that circuit on or running while the compressor was filling the tank. It would start to run and the fan speed would go up and down and then just quit and buzz. Hope this helps.
Posting Guru
Joined: Mar 2003
Posts: 1,943
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It sounds like you do not have enough amperage for startup. That happens to me semi-regularly and does not damage it if you don't do it all the time. Make sure that you're maximum startup amperage is less or no more than 80%of your maximum circuit size.
Last edited by cwb; Feb 29, 2004 at 10:27 PM.
Fleet Mechanic
Joined: Aug 2001
Posts: 1,526
Likes: 0
From: Round Rock, TX
Are you using an extension cord? If so, don't. Try another outlet that's on a circuit with not much else. When you hear the buzzing, you'll probably notice that the cord is pretty hot as well.
Senior User
Joined: Oct 2003
Posts: 409
Likes: 0
From: New York
If ya ahve good voltage ameprage the pressure relief valve is working and the compressor turns over freely then the capictor could be shot on the motor. They normally dont were out that fast tho. But they do make a buzzing noise when they go bad.
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Posting Guru
Joined: May 2002
Posts: 1,495
Likes: 2
From: Northwest Fl
My little pancake porter-cable does it if the extension cord is too long. If you have adjusted the high-pressure side of the switch for nay reason, you may be trying to make it come on at too high of a tank PSI bogging down the motor.
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