12.5 HP Campbell Hausfeld unloader valve blows off all air

by Tony
(Ca)

I have a 12.5 HP 30gal tank Campbell Hausfeld gas compressor, it builds up to the 175 psi then blows off all the air until it gets down to the 125 cut in pressure then kicks back on and builds back to 175 and blows off again

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The interface between a gas powered engine and your air compressor includes throttle links, unloader links and other equipment that is best serviced by a mechanic.

The first thing I would do though is to see if there is a check valve in the line into the tank. If so, after you have shut down and emptied the tank of air, pull that check valve and make sure that it is still closing tightly to keep air in the tank when the unloader is open.

Did that do any good?

Bill

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Campbell Hausfeld model VT558704 motor size

A friend has a Campbell Hausfeld model VT558704 single-stage 120 volt. I'm told it is a 5 horsepower air compressor. It's not functioning as it should. It currently has a 1.5 horsepower motor on it.

What size motor should he have installed on the compressor?
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If the compressor is a 5HP sized pump, then it is a waste of time, and probably the destruction of the motor, to try and run it with a 1.5 motor.

When I search for info on this compressor on the internet, yes, it appears to be a 5 HP compressor, therefore, run it with a 5 HP motor.

Bill

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problem with model wl604802al

by Don Wessel
(22150 w 267 th paola ks)

I bought a used campbell hausfeld air compressor at a garage sale
model wl604802aj.

It had about 5 gallons of water in the tank. I drained it and now it will not get more then 60 lbs in tank and it just keeps running

What is the problem

thanks Don

my e-mail id dbant@mokancomm.net
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Don, there are a number of reasons why an air compressor will run and not build pressure.

The most common are found under troubleshooting on the sitemap page. Please have a look, and then comment here with what you found on your air compressor after following some of the tips.

Cheers,

Bill

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Campbell Hausfeld WL6007 (Workhorse) Blows breaker upon restart - no unloader?

by Dan
(Worcester, MA)

Hi Bob,
I've read through your articles on compressors blowing fuses, and I believe I have a bad unloader valve. The compressor will run fine until it fills up, it will shut down, and after I use enough air, it tries to start up again. At this point, you can hear the motor struggle and then poof, the breaker trips. I can work around this by unplugging it until I've used lots of air, then plug it back in, and it will again run fine until it reaches capacity.

That said, I'm sure you will say it is the unloader, but I can't seem to find an unloader on the schematics. I see an unloader tube (on the sears website), but no unloader... What am I missing? Can you point me to the right part I'll need?

Here is the Sears part list:
http://www.searspartsdirect.com/partsdirect/part-model/Campbell-hausfeld-Parts/All-Products-Parts/Model-WL6007/0166/0703000

Thanks for your time!

Sincerely
Dan
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Hi Dan...

If there is an unloader tube then there has got to be an unloader somewhere.

I suspect, from looking at the diagram on the link you sent, that your unloader valve is part of your pressure switch.

Some folks have the smarts to tear down and rebuild a pressure switch. I don't!

I suggest you remove your pressure switch (carefully noting what lines go where) and take it with you to a compressor store. Find a similar switch and get a replacement.

Cheers,

Bill

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