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I have an air mate by emglo and it will not stop running even when I turn the switch to off. The pressure builds and the relief valve goes off. Can you help? Dan

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  • 273 Answers

Sounds like a bad pressure switch, The contacts may have become welded together. Change pressure switch. All you need is a mpart number on the body or in the cover of switch. Shop around, possibly ereplacement parts or ebay, will be cheaper than buying it fromemglo.

Posted on May 19, 2017

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Posted on Jan 02, 2017

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SOURCE: My EC12 builds up pressure, but then releases all but about 10 psi.

The non-return valve is sticking and it's an easy fix. First, for safety, unplug the electric power to the unit and release any pressure in the tanks. Then unscrew the cap of the non-return valve (between the compressor and the tanks). Inside you should find a tapered rubber plug which is probably sticking in the valve housing. Sand down the diameter of the large end of the plug, being careful not to damage the flat face at the narrow end (which is the sealing surface). For sanding try 400 or 600 grade wet-or-dry paper and sand until the plug just moves freely in the housing. Reassemble and the compressor should work. Incidentally it's an oil-type unit, and quite durable. Make sure it has enough oil.

Posted on Nov 14, 2008

  • 1388 Answers

SOURCE: Craftsman 25 gallon compressor wont cut off

The pressure switch has snap action contacts that are opened by a diaphragm pushing against a spring mechanism. Unplug the compressor and remove the cover to the switch and look for the contacts. Make sure that they are not welded together from use. Move the on/off lever to see if they open and close. You may have welded contacts or broken mechanism within switch. A factory replacement is expensive, however if you are a tinker-er you can use a lower price generic pressure switch available on ebay. Switches are sold by pressure range, you need a 120#. Fittings may need tweaking. Enjoy

Posted on Dec 12, 2008

  • 65 Answers

SOURCE: with compressor running the relief line blows off

check that the non return valve is not stuck closed
hope this helps ian

Posted on Mar 25, 2009

  • 1388 Answers

SOURCE: Dewalt 4 gal air compressor will not build pressure in take.

The bleed valve is an unloader of sorts that allows the compressor to start with-out a load. It closes when the pressure in the airline reaches about 20-25lbs with good volume. If air volume is not sufficient, the valve will not close. To solve the problem lets do a few tests. A long cord will reduce power and reduce air volume. Try powering the compressor with-out extension cord. If bleed valve closes when you do not use a cord, the compressor is not getting enough voltage, use shorter cord of the 12 gauge quality and more hose to reach work. If valve still does not close, check for air leaks on all fittings including around pressure switch and drain valve with soapy water. Repair as necessary and retest. If no leaks were found, temporarily plug bleed valve port with screw/bolt and run compressor till set pressure cut-off while counting minuites/seconds. The compressor should fill and shut off within three minutes or so. If it takes an unusually long time to fill, then the reed valves /valve plate is worn and leaking pressure back into cylinger. Leaking valves will usually result in very hot discharge airline/air. Reinstall the bleed valve after test. Parts and partslist are available at www.toolpartsdirect.com . Good luck on the repair and email if you have other questions.

Posted on May 06, 2009

  • 1 Answer

SOURCE: Was working normal suddenly will not build pressure

Maurader1 an apprentice has this problem solved and is spot on. All these gurus and wiz need to stick to the basic and common sense. The first place your pump will give out after use or abuse is the gasket. All this garbage about defective reeds and defective pressure switch is a lot of nonesense if you first don't rule out the most common problem the head gasket. I'm cheap and this thing has paid for itself 10 time over. You can get a gasket kit for $7, but I fabricated a gasket out of the back of my notebook and sprayed some gasket spray and been working like a charm ever since.

Posted on Jan 04, 2010

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1 Answer

Leaking around Pressure Switch. Ordered & replaced switch but still leaking


Some pressure switches have a valve that reliefs the compressor head pressure when the motor stops and closes the head pressure relief valve when the motor runs.
There is a check valve that keeps air pressure from coming back to the compressor head and the relief valve.
I think the check valve is leaking tank pressure to the relief valve and compressor head.
The check valve is where the pressure switch mounts on to and it mounts threaded on to the compressor tank.
Try replacing the check valve

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That is the compressor's holding capacity 150psi. Therefore, the cut-out pressure has been reached. The safety valve opens to relieve the excessive psi. Compressor should come on at 120 psi.

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I have a C2006 Type 4 Porter Cable pancake compressor which will build pressure all the way up to 150psi then cut off as it should but there will be a loud hissing and pressure drop until the cut on...


first you have a reciprocating pump and the hissing you ear probably comes from the unloading valve on the pressure switch(it will look like a bike tire valve)if there is air coming out the valve when the compressor is off it probably means you have a bad check valve.This valve is use to unload the pressure inside the pump for an easy start .a motor always drive more amps on start up if you cant unload this pressure you will trip the overload(you probably have a reset button on your motor)check the specs on your pressure relief valve ,its a small pump maybe its just adjusted to high.in this case your pressure relief valve will open .If the pressure is fine and there is air coming out the relief valve then you have to replace it!to adjust your pressure turn the screw on your pressure switch clockwise to increase and counterclockwise to decrease .usually you have a 30 psi between cut-in and cut-off called the pressure differential.It can be adjusted on some pressure switch.be sure you put some teflon tape on the treads if you replace something to avoid air leaks.hopes this help!

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Compressor runs to 175psi but trips pressure relief when pressure drops tries to restart motor but motor wont turn blows breaker. changed whole pressure switch have same problem.


The problem is lilkely the check valve between the compressor and the tank -- it is alowing pressure to build from tank to compressor preventing the compressor from turning over. Clean, maybe replace, check valve...

Charlie

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1 Answer

Compressor not building enough pressure.only 5lbs.


It seems that your cut off switch or your relief valve is not working. If the cut off switch stops the compressor at 5psi instead of 100/120, then the switch is defective. If the relief valve operates (loud whooshing sound and the compressor keeps running), then the relief valve needs replacing. Normally the relief valve wears out first as the seal gets worn or the spring fails.

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1 Answer

Relief value releases and will not reset


Likely the check valve is bad or has contamination on the seat. The result is the pressure will bleed back out the compression relief valve which is often as part of the pressure switch.

If the safety valve is the one that is bleeding, then the pressure is set too high at the pressure switch.

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How do you adjust the pump pressure valve on a Emglo model KU


do you mean the relief valve. it is factory set for your safety and the sefety of the equiptment. also known as the safety relief valve.

if you are talking about working pressure you need to adjust that with the air regulator.

if you are talking the cut out pressure sensor, again this is also factory set for safety. if your equiptment is designed for 110 psi then when your resivor reaches that set point it should cut the motor off and stop running.

Feb 21, 2010 | Air Tools & Compressors

1 Answer

My dewalt emglo air compressor has been pumping up and cutting off but can here air escaping in the inside and when it reaches cut-in the motor just hums loud and cuts off until I bleed all air and then it...


Sounds like the pressure relief valve......It works as a relief so when the motor comes on it is not under a load/pressure. Much eiser to start not under a strain.........

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1 Answer

COMPRESSOR RUNS, FILLS TANK, AND THEN LEAKS OFF ALL THE PRESSURE. WHAT IS GOING ON?


Is the air "leaking" from the pressure relief valve? If so it is either faulty or it is doing what is supposed to do. The pressure relief valve is there in case the pressure switch fails.The tank could blow up if the pressure switch fails, so the pressure relief valve is there as a secondary measure to insure the tank does not receive too much air pressure. Assuming your gauge is operating properly, watch the gauge to see if it reaches the maximum pressure (check your manual to find the maximum PSI) or if it goes over the maximum pressure. If it goes over the maximum pressure then replace the pressure switch. If it the motor stops at the maximum pressure, replace the pressure relief valve.

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