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#2512774 - 06/24/18 08:12 PM Who knows shop air compressors?
71sat440 Offline


Registered: 06/07/03
Posts: 13809
Loc: Willow Grove PA
I've had no problems with my compressor until he other night I turned it on and and started using it, after the first cycle it shut off and I heard hissing.

A small valve running off the head to the on switch was leaking air.

A little while latter I heard a brrr, brrr... noise like an electric motor not being able to start but nothing happened.

Turns out it had popped the breaker.

Left it alone, tried again the next day, same thing air leaks from the valve and it pops the breaker.

Heres some picks. The valve that leaks is off of the real tiny copper line that stops right at the on/off switch.

Any idea, what is wrong with it? Or where you would even buy parts for a compressor like this?

http://s2.photobucket.com/user/shirowfan/slideshow/compressor

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#2512777 - 06/24/18 08:26 PM Re: Who knows shop air compressors? [Re: 71sat440]
fourgearsavoy Offline


Registered: 12/07/04
Posts: 9333
Loc: Rittman Ohio
looks like the regulator/switch. You can get parts here https://www.pacificaircompressors.com/sh...able-4-port-14/

I think it wont turn on because the switch won't give your motor all the power. It may also be internally shorted causing the breaker to kick.

I would try replacing the whole regulator unit twocents

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#2512778 - 06/24/18 08:26 PM Re: Who knows shop air compressors? [Re: 71sat440]
Paul_B Offline
pro stock

Registered: 01/19/03
Posts: 1396
Loc: Tallmadge, Ohio
You may have a faulty unloader which is part of the pressure switch. The compressor pump in your case may be having to start up against tank pressure which is causing an overload condition.

You should be able to buy a replacement switch pretty reasonably.

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#2512786 - 06/24/18 08:41 PM Re: Who knows shop air compressors? [Re: Paul_B]
restoman Offline
super stock

Registered: 08/30/03
Posts: 870
Loc: Sarnia, Ontario
Originally Posted By Paul_B
You may have a faulty unloader which is part of the pressure switch. The compressor pump in your case may be having to start up against tank pressure which is causing an overload condition.

You should be able to buy a replacement switch pretty reasonably.


^^^^ What he said.
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#2512814 - 06/24/18 09:34 PM Re: Who knows shop air compressors? [Re: 71sat440]
astjp2 Offline
master

Registered: 01/18/11
Posts: 4333
Loc: Utah and Alaska
$40 part on ebay
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#2512825 - 06/24/18 10:14 PM Re: Who knows shop air compressors? [Re: restoman]
justinp61 Offline
master

Registered: 10/01/03
Posts: 9766
Loc: W. Kentucky
Originally Posted By restoman
Originally Posted By Paul_B
You may have a faulty unloader which is part of the pressure switch. The compressor pump in your case may be having to start up against tank pressure which is causing an overload condition.

You should be able to buy a replacement switch pretty reasonably.


^^^^ What he said.


What they said.

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#2512903 - 06/25/18 06:35 AM Re: Who knows shop air compressors? [Re: 71sat440]
Challenger 1 Offline
Too Many Posts

Registered: 02/05/05
Posts: 28304
Loc: Cincinnati, Ohio
Popping the breaker?? Motor pulling too many amps?

Take a volt meter and make sure the contacts are transferring 120 or 220 volts to the motor before any thing. Could be the motor bad and why buy a pressure switch/unloader if the motor is bad.
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#2513088 - 06/25/18 02:34 PM Re: Who knows shop air compressors? [Re: 71sat440]
mike250cr Offline
member

Registered: 08/16/05
Posts: 22
Loc: NY
You need to do some diagnosis to isolate the problem & also understand how it works.
At the top of the tank where the large copper line connects is a check valve ( 1 way valve ) that does not let air pressure from the tank back to the compressor.
Small copper line to switch is a pressure relief switch, when the compressor shuts off the relief valve releases the pressure trapped between the check valve & the pump. When the motor restarts it does not have to fight against air pressure. The valve on the small line should only hiss for a few seconds to release the trapped air.

If the check valve has failed the small line will continue to leak air and there will be pressure in the pump not allowing the motor to restart, causing the breaker to pop.

Drain all the air pressure from the tank, reset the breaker & start compressor. Does it start? If so motor is ok. Let it build up until the pressure switch shuts it off. When it shuts off the relief valve should hiss air for only a few seconds. If it continues to leak the check valve has most likely failed. Take large copper line off at tank, remove & inspect valve, replace as necessary.

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#2513140 - 06/25/18 04:22 PM Re: Who knows shop air compressors? [Re: 71sat440]
Stanton Offline
master

Registered: 10/13/05
Posts: 6700
Loc: Ontario, Canada
"mike250cr" nailed it ....

Had this problem too and thought it was something to do with the switch but FORTUNATELY I found this website that explained that it is the large check valve that causes the issue you describe.

https://mastertoolrepair.com/air-compressor-parts-check-valves-c-25_4.html

My compressor is an older Campbell Hausfeld and the valve is now obsolete BUT a quick check of the original p/n on Ebay revealed a guy who makes and sells them. Back up and running a couple days later !!

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#2513677 - 06/26/18 08:31 PM Re: Who knows shop air compressors? [Re: 71sat440]
71sat440 Offline


Registered: 06/07/03
Posts: 13809
Loc: Willow Grove PA
Thanks everybody!

I replaced the check valve, fired it up and there were no leaks, as soon as it was full I dumped air out of one of my valves and it re fired back up.

So it looks like its fixed. Thanks!

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