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I have a craftsman professional twin cylinder 240 volt air compressor model #919.184191. It has a tube running from the tank to the switch and it is blowing air out where the tube connects to the switch. I installed a new switch and it does the same thing even when it only has 20 lbs pressure in it.

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Leaking in-tank check valve will cause air to continually leak out of unloader valve at pressure switch. Remove brass/steel fitting at tank and check seat for debris or replace as needed. You can use generic valve just watch fitting sizes. Available at Good luck

Posted on Sep 30, 2010

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Oct 21, 2016 | Air Tools & Compressors

1 Answer

Charge air pro model ir330e20 builds pressure to only 60 psi and will not stop running


Your compressor is leaking air somewhere between the compressor head and the tank. With the compressor running, feel carefully around the ends of the tube that leads from the compressor head to the air tank. You will probably feel some air leaking around one end or the other. If so... remove the tube and find out which packing has failed.

Mar 09, 2013 | Craftsman Air Tools & Compressors

1 Answer

Can my 240 volt compressor run on 208 volts?

Being an Authorized Service Center for a couple air compressor companies I can tell you I have replaced several 240 volt motors because they were run on 208 volts. Not knowing what model you have or what motor is on it, yes your compressor will run on 208 volts but it is very ******* the motor. At startup, all voltages have a dropoff then come back up to their rated voltage. The dropoff is determined by the original voltage and length and guage of lines getting the power from your transformer to the compressor With 208 volts it typically drops to around 190 volts at startup then comes back up to 205 to 208 volts while running. The motor needs the full 240 volts when it restarts and there is already pressure in the tank If the motor's not marked, call the manufacturer and see if it's rated for up to 240 volts or only for 240 volts.

Feb 08, 2012 | Craftsman Air Tools & Compressors

1 Answer

When it runs it sounds like an air leak from the engine and the tank does not fill. i do not hear air leaking when not running.

This sounds like the compression release valve is leaking. This valve bleeds the cylinder pressure to allow the motor to start without having the load on it. On this size compressor the valve is often built into the pressure switch. It is a little "pintle" type valve and you will hear hissing while unit is running but the opressure will not build up very much. When the pressure switch calls for the unit to run, the little valve closes with the switch. COntamination or other stiction keeping the valve form closing will cause the problem. You will find this near a tube that goes to the pressure switch. The switch itself hooks into the tank, but this little tube will connect to the cylinder head or the main tube from the compressor. Yours may look similar to ones at this site:
The valve is also commonly called the "unloader" valve.

Jul 29, 2011 | Craftsman 3 gal. Air Compressor, 1 hp,...

1 Answer

Hi, my compressor takes forever to fill up, its a 7hp 75 gallon tank 240 volt 15 amp model. It can take up to 1/2 hour to fill. never did before(filter is clean also) Thanks Tom

Without the model number I am not for sure what pump you have but there are 2 things that can cause this.

#1 Would be the check valve in the tank may be weak or bad. This allows air to go into the tank and not escape. If this is bad typically you will have air coming back out of your pressure switch after the air compressor is turned off.

#2 You may have a blown head gasket between you first and second stage in the top of the compressor pump. To solve this problem you would need to replace the head gaskets in your air compressor.


Oct 08, 2010 | Craftsman Air Tools & Compressors

4 Answers

What type of oil does this unit take?

Air compressor oil. I prefer synthetic, but you can use regular compressor oil also.

Jun 26, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Why did my craftsman 5 hp 240 volt 125 psi air

your motor overheated from too low a voltage if theres a manual reset try this,also replace the two motor start and run capacitors on the motor body

Dec 24, 2009 | Air Tools & Compressors

1 Answer

I have a Craftsman air compressor twin cylinder, 2 hp, 20 gal. 220v. Model #106.154781. No operators manual. Problem is that when filling the tank the automatic shut-off no longer works and it must be...

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The pressure control switch which the compressor usually pumps into and is mounted on the tank, contains a backflow check valve, the pressure regulator switch, and a compressor pressure release valve. It's probably available only as a complete unit. The pressure switch itself is usually a microswitch that can be obtained locally at a hardware or appliance parts house. Make sure that the pressure switch adjustment hasn't been set higher than the compressor can reach. If you remove the cover, you can watch for mechanical movement at the switch when it is supposed to shut off. Don't poke at anything in there with metal tools--220 volts will give you a lethal shock!

Oct 30, 2009 | Air Tools & Compressors

1 Answer

I have a 2 stage twin v. the motor runs and it is pumping air but it will not build any pressure.

The compressor should pump into a final check valve where the pressure switch is located. Check the condition of that valve. If the compressor itself is not pumping, the cylinder heads need to be removed and the valves in each head checked. Check the condition of the cylinder walls which should be smooth without any lengthwise grooves. Is the tank rusted through? Any leaking safety valves? Make sure you have proper oil level in the crankcase. Make sure the intake filter is clean. Check the tubes between the cylinders and the tank for leakage (splits or rust throughs). Just work from intake to tank in a progression, checking output at each point.

Oct 29, 2009 | Air Tools & Compressors

1 Answer

Air compressor fills, but slows down as the pressure builds

sounds like you need a new check valve which should be somewhere between the compressor outlet piping,tubing,etc and the tank which prevents the air in tank to back feed to the compressor which would cause hard starting and could damage the motor easy way to check is when you shut off the compressor with some air in the tank if the check valve is bad it would continue to bleed air out out the unloader valve .the unloader valve on your unit is most likely part of the pressure switch when the unit shuts of it should only bleed down the pressure in the pump so it would make it easy to start when needed hope i didn't confuse you

Mar 22, 2009 | Campbell Hausfeld Air Tools & Compressors

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