Question about Craftsman 20 gal Horizontal Compressor

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I have craftsman 20 gallon five horse compressor. It pumps up to a certain psi and then it bleeds the pressure until it reaches a certain point and then pumps up again. The way its lets the pressure out is a little flat plate comes up and touches a pin to the right of the on/off switch. What causes this? How can I fix it? Any help would be appreciated.

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The operation of that compressor is that the pressure switch will open when it reaches its set pressure, usually about 125 psi. when the switch opens and the motor comes to a stop the little valve on the side of the switch is meant to unload the pump head of pressure for the next start up. the pressure in the head and the tube leading to the tank is what is relieved, to prevent tank pressure leaking back there is a check valve where the discharge line enters the tank. what it sounds like is that check valve is not closing when the pump stops, and should be replaced.

Posted on Aug 27, 2010

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Posted on Jan 02, 2017

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I just bought a craftsman pneumatic 1/2-in drive impact wrench. And used it with my craftsman 4-gallon 1hp air compressor tried to loosen the bolts on my car wheel wouldn't loosen them help


Pneumatic tools are rated in cfm (cubic feet per minute). Your 1 HP air compressor is rated at probably not more than 3 cfm while the 1/2 " impact driver needs at least 8 cfm, maybe 12 chm of air.
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If you can, return the air tool and get a good electric tool instead.
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Jul 24, 2017 | Craftsman Air Tools & Compressors

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I have a 3 gal craftsman air compressor. Compressor runs but will not build more than 20 psi in tank reserve. Whats wrong?


if shuts down at 20 psi regulator is set wrong
it runs but only builds 20 psi, compressor is probably worn out

Oct 03, 2015 | Craftsman Air Tools & Compressors

1 Answer

Compressors


The pressure regulator on an air compressor is designed to let the pump motor run until the pressure in the tanks reaches their safe level. While you are using the air the pressure drops in the tanks until it reaches the level where the pressure switch turns the motor on again and refills the tanks to their rated level. The pressure where these two things happen is usually with in ten psi above or below the rated levels because few regulators are so precise and are affected by temperature that they turn and off exactly at the rated pressures. If a pressure regulator is damaged or broken it is possible for the tank to either reach unsafe high levels or not turn on when the pressure drops to where it should restart the motor. If you are in doubt, have the regulator checked or replaced as overpressured tanks are very dangerous.

Jun 24, 2012 | Craftsman 150 PSI Air Compressor

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Comperrsor pumps uoto preassure, but when the preasure drops it tries to start . The motor come on but will not turn compressor until preasure drops to about 20 lb. Then it will start and build up to...


Run the compressor until there is about 75 psi in the tank and turn it off at the pressure switch. Remove the black bleeder line from the pressure switch:
1. If absolutely no air comes out of the line you may have a bad start capacitor on the motor. Have it tested at an electrical or refrigeration shop or just replace it to see if it takes care of your problem.
2. If you get a short blast (five or so seconds) of air then nothing your pressure switch isn't letting the head pressure bleed off after the motor shuts off. This pressure has to be relieved or the motor has to fight the tank pressure when it tries to restart. Reconnect the bleed off line and turn the motor back on. If it starts normally, replace the pressure switch. If it struggles or won't start it is more indicative of a bad start capacitor.
3. If you get constant air flow from the bleed line the problem is with your tank check valve. This causes the same problem as above. Replace the check valve.

May 04, 2011 | Ingersoll Rand 30 Gallon Garage Mate...

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Compressor initially starts up and fills tank to 120 psi with no problem. Compressor shuts off. When a tool is used the compressor tries to kick back on but hums and won't turn pump. If the "off"...


There is a small valve on the pressure switch that should relieve the pressure between the compressor and tank check valve. Make sure when pressure switch trips, it engages the relief valve and it bleeds the air out. Sometimes the valve itself comes loose and is not engaged by the lever in the pressure switch.

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Where can I get a pressure switch 115-150 psi for a coleman 20 gallon air compressor


I do not use factory parts when possible to repair compressors. I use generic pressure switch, checkvalves, guages from www.grainger.com. Watch port size, number of access ports and unloader availability when ordering. Pressure switches are generally replaced when contacts are burned or over pressurizing to point of safety opening. If compressor is not reaching set pressure look for leaks or faulty parts in pump. Good luck

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1 Answer

Compressor shuts off before reaching max pressure


Yes,but if the max is 125 you don't want to increase it above 110 and set off the pressure relief valve.

Jul 21, 2009 | Craftsman 1 Hp, 4 Gal. Air Compressor

1 Answer

I have a electric air compressor craftsman 3.5hp 15 gallon it wont start back up when air is low


The pressure switch controls the cut-in and cut-out points for the motor. Some switches have a differential adjustment besides the pressure adjustment. The differential controls the spread between cut-in & cut-out, (say in at 80 PSI, out at100 PSI)

Try looking for these if you didn't get a manual.

Good luck

Apr 26, 2009 | Craftsman Air Tools & Compressors

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