Question about Craftsman 3 gal. Air Compressor, 1.5 hp, Horizontal k

5 Answers

Air compressor 3 gallon

When i switch the compressor on it runs good till it reaches 40 psi and then pressure never increases after that. It just keeps running.

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  • Anonymous Sep 21, 2008

    I have a 12 gallon air compressor. It runs fine but the pressure won't get over about 20, just keeps on running.

  • Anonymous Oct 01, 2008

    Craftsman 2 gal. 1.5 hp. runs fine up to 40 lbs.,motor keeps running without pressure increase.

  • chatravis Oct 15, 2008

    Same thing. Compressor is fairly new and will build only to 20 psi. No signs of any air leaks.

  • fenchurch Oct 21, 2008

    I have the same issue. It reaches 40 psi, builds no more pressure but keeps on running.

  • Anonymous Nov 18, 2008

    thanks . my head gasket was gone as described .

  • Dane Lanne
    Dane Lanne Nov 27, 2008

    I too have a Craftsman 3 Gal. Air Compressor,1.5hp, Horizontal with the problem of pumping up to 35 psi,and with the pump still running,no more pressure in the tank.I figured that maybe,it was 1 of three things:Check valve bad,pressure switch bad,unloaded switch bad.Dont know???Can you help on this???

  • Anonymous Mar 13, 2014

    10 gallon tank 3.5 hp will not run in cold weather oil compressor

  • Anonymous Mar 22, 2014

    It runs good, but itonly pumps up to about 60 psi, not the 90 psi my switch is set for. It just keeps running but will not increase pressure???

  • Anonymous Mar 28, 2014

    3 gallon, only builds to 40 psa, won't shut off

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When I turn compressor on it does not build up any pressure ?

Posted on Oct 25, 2008

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I had mine do the same thing... The head gasket blew out between the intake & discharge side.
I went to O'rileys and bought the blue gasket paper and cut out a new one ($3.00) works fine now.
Just take off the plastic cover, undo the discharge line at the compressor head, remove 4 allen
head bolts, lift off cylinder head and you'll see the gasket gone at the center bridge.
Draw a picture of the way the valve plate under the head is assembled so it goes back together right.
Use care cleaning the old gasket off, NO power tools....Hand wire brush to preserve the little ridges
that bite into the gasket, Soak with solvent helps..You can also order the gasket kit from Sears
about $12.00...Hope this helps ya......John

Posted on Oct 31, 2008

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Are you talking about removing the small plastic cover where the on/off switch is or the large plastic shroud? I am having trouble getting the small allen head screws to come out. what's the trick?

Posted on Jan 14, 2015

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Same problem here, no air compression, motor just runs

Posted on Oct 06, 2008

It reaches 40 psi and then pressure never increases after that. It just keeps running.

Posted on Sep 15, 2008

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1 Answer

Its a ten gallon 2.0 hp air compressor and it wont cut off when reaching max psi


This is caused by a mis-adjusted or faulty pressure switch. You can start by unplugging the compressor, removing the pressure switch cover (probably where your power cord goes into) and turning the adjustment a bit counter-clockwise ( 2 or 3 turns).

Then give it a test run. If it doesn't seem to adjust, replace the pressure switch.

Jun 03, 2011 | Air Tools & Compressors

1 Answer

Can I limit the pressure to 120 PSI, the upper recommended limit for my nail gun?


adjust your pressure switch on your compressor .remove the cap and turn the screw clockwise to increase and counterclockwise decrease.turn the screw counterclockwise a bit and release some air till the compressor start pumping.then just before to reach 120 psi turn counterclockwise to stop the compressor at 120.then release some air again till it cuts in again and look at what pressure it will stop.keep going that way till you get your 120 psi.cut in should be around 90 psi(30 psi differential)depending what kind of pump you have (if the pump can handle 150 psi )you can adjust it to cut in at 120 and cut off at 150 and install a pressure regulator adjusted to 115 to 120 and get a nice steady pressure going to your nail gun.(the best way to do it!!!)

Jan 17, 2011 | Air Tools & Compressors

1 Answer

The compressor reaches 40 psi and won't build pressure past 40 psi it just keeps running. checked for leaks and could not find anything the reeds are working fine.


Hi, my name is John. Welcome to FixYa. There has got to be a leak, check the line coming from the pump to the tank, you may have to remove it to check. I find this is often over looked. Thanks for choosing FixYa...John

Nov 24, 2010 | Stanley FactoryReconditioned Bostitch...

1 Answer

Shut off before it reaches 150 psi turned up the regulator up but it stops about 60 psi should go to 150 psi


the air regulator only regulates the flow of the air as to how much. their is a pressure switch that turns on and off the power to the compressor when it reaches it's set pressure.
follow the plug wire to a small box this should have the switch arm you flip to start it.
remove the cover with the unit un-plug.
there will be a spring with a nut on top tightening this nut or loosening it will adjust when the pump will cut off.
the best way is to test by adjusting one way and watching the pressure till it hits the desired rating you want.
if it keeps pumping un-plug the unit then back off the nut or tighten till you hear a click then plug the unit back in it should not run then.
drain the air and re try the unit it should cut off at the pressure then if so your fixed look for burnt contacts if their black and have little craters on the contacts then that hole switch should be replaced and you can buy them at the presetting you need.
hope this helps

Sep 03, 2010 | Campbell Hausfeld 5 Peak / 1.7 Running HP,...

1 Answer

Motor "bogs down" at roughly 120 psi...almost stops


You suspect this unit as being a two stage because of the unusually high cut off pressure. It is a single stage and the motor really has a difficult task and is being pushed to the limits. to reach this pressure. We usually reset the pressure to lower setting ~~ say around 140. Your pump probably has a leaking intank check valve (brass fitting at tank) or leaking valve plate in pump. Simple tests : with pressure in tank unplug compressor from outlet and listens for air leak around pressure switch. As you unplug the running compressor from outlet you should hear air leaking from pressure switch for just a moment as air is let out of airline from pump to tank. If air leaks out till zero pressure then change the valve. If tank holds pressure then valve probably ok. Next test, with no air in tank and air filter removed, plug in compressor and feel intake port for strong suction. If the valve plate is bad, suction will decrease as pressure neers the 120 mark till the point of feeling that air is actually blowing out of intake. With good valve plate there will be strong suction untill unit reaches set pressure. If valve plate is bad also change the cylinder and piston ring. Good luck with your repair.

Jul 28, 2010 | Dewalt 2 Hp 4 GAL Air Compressor

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

The pressure reads 40 psi on both guages on this


with it running check regulator knob .it pulls up turn right pressure should go up.if not regulator bad

Jun 20, 2009 | Coleman Powermate 11 Gallon Air Compressor

1 Answer

Drops compressiom from 120-60 psi after 3 new pressure switches


When the pressure switch fails the comperssor will overpressure to the point of safety release at about 150 - 160 psi. It sounds as if your compressor is not producing enough pressure to cycle off at 120 and just keeps running. This happens when air is leaking from fittings or worn cylinder / reed valves. Don't worry, with some simple tests we will find the actual problem. I am assuming that your compressor is oilfree type. If there are leaks the compressor may not reach set pressure. I use soapy water on all connections and on the head/headvalve (remove plastic covers to get to all parts that may leak) while compressor is running. Make repairs as necessary. If still low pressure, while compressor is running and has reached max obtainable pressure (in your case 60 lbs), carefully place finger over intake port hole (remove filter). If the compressor is pumping normally but leaking there will be ample suction at intake and cause the compressor to speed-up when intake is obstructed with finger. If you feel plenty of suction and no visible (soapy water) leaks, then the problem is probably the cylinder /ring is not correctly seating /scratched and air is leaking past cylinder. Make sure that the cylinder /piston ring is properly aligned and that the lip on the vinyl ring is up toward the head. On oilfree compressors you can examine the cylinder by pushing the piston all the way up, then look for scratches neer top of cylinder. If scratched, pressure is leaking past cylinder, install cylinder kit. If you do not feel suction but rather air blowing out of the intake, (do this test when tank has reached 60 psi) then the problem is the headvalve plate/reed valves are leaking. The reeds must seal perfectly on their seats and not be bent or have obstruction. Replace as necessary. If reeds or headgasket is leaking the discharge air will be very hot. Only one other thing to check and that is the intank check valve. Easy to check. Run compressor till you have about 50+ lbs in the tank then unplug compressor. Carefully loosen the inlet hose at checkvalve and listen for air leaking out of tank. (check valve is the brass valve at tank) If leaking replace checkvalve. Use caution when removing head to try and save the gaskets. If you have oil type pump, and no air leaks (soapy water test) suspect reed valves/valve plate. Good luck on your repair and email if you have other question.

May 06, 2009 | Campbell Hausfeld 28 - Gallon Air...

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