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Air compressor won't Work

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Jeff(KS)

07-13-1999 10:32:17




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I have a 4 HP Campbell-Hausfeld oil less air compressor that runs just fine when filling the tank the first time. However, when the tank pressure is reduced to a level for the motor to kick back on, the motor sits there and hums. I have removed the shield and tried to turn the fan with my hand and there is resistance. If I let it sit for the day and plug it in, it runs fine. Any ideas what needs replaced? Estimated cost to repair?

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dunebuggy

02-08-2001 16:11:09




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 Re: Air compressor won't Work in reply to Jeff(KS), 07-13-1999 10:32:17  
compressor runs a few sceonds, then trips the circuit breaker on power supply.what`s wrong with it.



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dunebuggy

02-08-2001 16:04:08




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 Re: Air compressor won't Work in reply to Jeff(KS), 07-13-1999 10:32:17  
compressor runs a few sceonds, then trips the circuit breaker on power supply.



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Ned

07-18-1999 22:15:50




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 Re: Air compressor won't Work in reply to Jeff(KS), 07-13-1999 10:32:17  
Sounds like the unloader is not unloading!
The unloader relieves the air pressure from tank to compresser after set p.s.i. is acheived.
That way the compressor is not under a load at start-up. Since it starts fine after it sits a day, sounds like your losing tank pressure also.
good luck. Ned



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Bill From Ontario

07-19-1999 12:26:34




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 Re: Re: Air compressor won't Work in reply to Ned, 07-18-1999 22:15:50  
Most small home-use compressors don't have an unloading valve. They have a pressure activated start switch. Mine cuts out at 125psi and starts back up at about 80 psi. The only valve between the compressor and tank is a check valve, so when the compressor starts back up, its working against a tank pressure. Your advise holds true for large industrial type compressors. Bill.



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Ned

07-19-1999 22:43:13




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 Re: Re: Re: Air compressor won't Work in reply to Bill From Ontario, 07-19-1999 12:26:34  
Mine does. It's a one hp two cyl. single stage that runs 110v ac w/belt drive.



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Bill From Ontario

07-20-1999 03:53:48




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 Re: Re: Re: Re: Air compressor won't Work in reply to Ned, 07-19-1999 22:43:13  
That's interesting. What make is it? I've got a 3 1/2 hp Craftsman, and it only has a pressure switch, so it starts under a bit of a load. That's why with the long power cord, the motor couldn't get enough amps to turn it over, and eventually the breaker would trip. I've never seen a small unit with an unloader valve, the soft start would make it more energy conserving. Bill.



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Ned

07-20-1999 22:33:30




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 Re: Re: Re: Re: Re: Air compressor won't Work in reply to Bill From Ontario, 07-20-1999 03:53:48  
Hi Bill, It's a Speedaire. Probably about 15 yrs. old. It also has the pressure switch, It's set 85psi to 110psi., with a 20 gal. tank. It is belt driven. I've even used it at my work as a back up when the big one went down. The Boss had a 5 hp.220v Craftsman direct drive oiless he kept for a back up, but it burned up after a week. It gets pretty hot down here in Texas, and my little Speedaire kept on chugg'in for two months before he fixed the main Compressor. I was impressed. You would probably do well to install an unloader on you unit, It's easy to do and fairly cheap. It would save wear and tear on your drive motor on start-ups. Ned

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B,R.FOSTER

07-25-2002 08:17:23




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 Re: Re: Re: Re: Re: Re: Air compressor won't Work in reply to Ned, 07-20-1999 22:33:30  
I have model no 919.727130 craftsman permanently
lubricated tank mounted air compressor.Problem
timing wheel came loose and broke piston.
I had it at Ponds repair shop in Fredericton n.b.
since last december 2001 and they claim they cannot get parts ,
Perhaps i could buy a new compressor to fit on my Tank,I only use it for inflating tires and small items around the shop.
could you help please.

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jay

07-15-2001 07:05:16




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 Re: Re: Re: Re: Re: Re: Air compressor won't Work in reply to Ned, 07-20-1999 22:33:30  
I was given a small compressor ( dayton speedaire model 3z394d belt drive ) but no books on it nothing, my questions are, were do you go to check the oil level, how do you change the oil , the compressor pressure won't go any more then 80 lbs , what can be wrong .Jay



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Richard Knox-Starving Artist Metal Art

03-08-2002 12:09:50




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 Re: Re: Re: Re: Re: Re: Re: Air compressor won't Work in reply to jay, 07-15-2001 07:05:16  
I have a Dayton Speedaire mo# 1Z945B ser#CVCO18010
It acts like its bound up when it tries to restart under presure.I have to kick start it.
I have changed belts,motor,presure switch.
Can you Help?



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Roger Prosper

07-23-1999 11:03:27




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 Re: Re: Re: Re: Re: Re: Air compressor won't Work in reply to Ned, 07-20-1999 22:33:30  
See if your pressure switch has a needle valve on the side. If it doesn't bleed off after shutdown, you are starting against full tank pressure and are pulling too many amps. Alternately, you may have a self bleeding check valve (LoadGenie tm.). These are a pain in the neck as they often fail due to obstruction of the hair thin orifice used to release the air after shutdown. Chuck it. Install a proper check valve and pressure switch with needle valve. While these also can fail, they are far more reliable and easy to install.Remember too, if you need more range, lengthen the hose, not the wire!
A handy hint, CFM = 4.2 x Electric motor horsepower (@ sea level) - some losses due to mechanical innefficiency. This is one of those inviolable rules of physics. I include this to counter some of the amazingly exaggerated claims some manufaturers spew forth about the output of their compressors. Also, check the wattage of the motors. 1 hp = 746 watts. I'll bet a lot of you will be unimpressed with your "5 hp" compressors after doing a little math! There is a lot of massaging of the facts (i.e. lying) going on in this segment of the market. CFM ratings are only meaningful @ 100psi. Who cares what a machine puts out at 40psi? I was a compressor tech for 4 years. See ya.

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Charlie Okla

07-14-1999 07:18:51




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 Re: Air compressor won't Work in reply to Jeff(KS), 07-13-1999 10:32:17  
The unloader is out of adjustment and/or the check valve is leaking. The unloader is part of the pressure switch on most of those. Remove the pressure switch cover and see if the arm is pressing on the schrader valve when the tank is at pressure. Also take Bill's advice and use long hoses not extension cords. You won't regret it.



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Alan K

07-13-1999 17:14:24




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 Re: Air compressor won't Work in reply to Jeff(KS), 07-13-1999 10:32:17  
From reading your information it seems likely to be that either the motor lacks power to run the compressor under the normal work load range or the compressor creates a greater than normal load after having run once. Both, Bill from Ontario and Tom R have good advice for you to check out.
Is this a new compressor or is this suddenly a new problem ?



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Jeff(KS)

07-14-1999 08:18:18




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 Re: Re: Air compressor won't Work in reply to Alan K, 07-13-1999 17:14:24  
It is a fairly new compressor. I bought it second hand about 9 months ago and have not really used it much until now. It looks brand new and cannot be over a couple years old. I might clarify that when I turn the fan blade with my hand, the resistance is when the piston is at the high point of the compression. I will try both suggestions this evening and let you know.



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Tom R

07-13-1999 14:40:03




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 Re: Air compressor won't Work in reply to Jeff(KS), 07-13-1999 10:32:17  
Jeff:
I am not sure about your Compresssor but most have an unloading valve located between the compressor and the storage tank, when the compressor shuts down it has a check valve that keeps the air in the tank and a vent that allows the pressure on the head of the compressor to vent, releiving the pressure on the compressor so that it does not have to start under load. Check when the compressor shuts off if this valve vents some air, most have a small hole in the side that may be plugged.
Hope this helps Tom R

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Bill From Ontario

07-13-1999 10:58:20




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 Re: Air compressor won't Work in reply to Jeff(KS), 07-13-1999 10:32:17  
Mine used to do something like that whenever I used a long extension cord. The motor couldn't get enough amps to turn over the compressor with pressure in the tank. Once I located it next to the fuse box and bought a longer air hose, the problem was solved. Hope your problem is as simple. Bill.



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Jeff(KS)

07-15-1999 06:08:19




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 Re: Re: Air compressor won't Work in reply to Bill From Ontario, 07-13-1999 10:58:20  
Long extension cord was the problem. Thanks.



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