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I have a Swan V-21 air compressor & i would like to find out what psi it should cut out at thankyou Col Reeve

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It should be in the name plate rating... check the pressure switch..it might be stucked so the motor doesn't shut off even the preset pressure is reached...if you are the one setting up for the first time your compressor then you should determine first the required pressure application..then set pressure cut out at 20% higher to that..

Posted on Jun 20, 2009

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Hello I have a 20 gallon kobalt model 033204. I just replase pressure switch but does same thing. When I tur on the compressor jus build 50 psi and shuts off.


This usually occurs when the motors internal thermal / amp breaker opens due to overload or weak breaker. Use an amp gauge to test for too much amp draw. If amp draw is normal, then problem could be the in-tank check valve leaking pressure back to the pump overloading the system, or weak capacitor or weak breaker. Bypass the breaker temporarily if the amp draw is normal to test system. Good luck

Oct 31, 2015 | Psi Air Tools & Compressors

1 Answer

Adjust pressure


The adjustment screw description-- is under the gray cover

The big spring is the general max pressure & cut off & initial setting

The smaller spring side is the twicking on the cut in or back on

They both work together in a way

Sounds like your using a well pressure switch-- on an air compressor

If so- then yes- you need a different switch for the application,
as the one you have is out of it's range

I set my compressor (single stage) at 80 & 135

Aug 12, 2014 | Square D PressureSwitch, 125-175PSI,...

1 Answer

I have a porter cable 6 gallon compressor. The motor used to cut out at 150 psi, but now it cuts out at 135. Is this a faulty tank pressure gauge misreading the pressure or a motor cutting out too early


it could be your air pressure adjustment knob, where your air line hooks up, which controls the psi to a lower or highist seting to adjust for different tools and uses.

Aug 26, 2012 | Porter Cable C2002 6 Gallon 2 Compressor

1 Answer

Dewalt emglow 2gal compressor will not reach cut out pressure


This usually means you have a problem with the piston & cylinder assembly or with the valve plate. If the piston ring or cylinder is damaged, it will compress some air but as the tank pressure rises more and more air will leak past the piston. If the reed valves on the valve plate are bent, warped or broken the same will happen. It's easy to check them for damage by removing the head but Emglow parts are getting harder and harder to find.

Apr 26, 2012 | Air Tools & Compressors

1 Answer

I recently purchased a 20 gal/1.5 HP, model 921.166420. The reset button on the side of the motor, (thermal overload Protector?) cuts out repeatedly. The few times where the motor did run and the pr


Could be weak thermal cutout or actual problem with unit. Thermal cut out easy to check with amp meter. Connect meter as required to monitor draw as unit fills and make sure that it stays at or below usage stated. If amp draw stays below stated usage and thermal cuts out, replace the part. If amp draw goes over amount stated turn off compressor and listen for air leaks (usually check valve will leak back pressure to pump causing extra load on motor).

Nov 29, 2011 | Craftsman 150 PSI Air Compressor

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

2 Answers

My air compressor can pump air in but when it get


when it reaches 120 psi it will cut out usually will cut back in at around 70- 80 psi if it struggles to restart at cut in pressure it may not be bleeding the head pressure om your compressor . this is done by the pressure switch which when shuts off releases a small squirt of air under it . to solve this problem you may need new switch . there is also the non return valve to check

Nov 12, 2009 | Campbell Hausfeld 28 - Gallon Air...

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

2 Answers

Cant set my compressor to automatic start/stop mode


U NEED TO ADJUST THE PRESSURE SWITCH ON THE BACKUP TO A LOWER PSI. TO COME ON AFTER THE PRIMARY. EXAMPLE: PRESSURE SWITCH ON PRIMARY COMP. SET AT 140-175 PSI AND BACKUP SET AT 135-170 PSI. U CAN USUALLY TURN ONE CENTER SCREW IN THE PRESSURE SWITCH COUNTERCLOCKWISE TO LOWER THE PSI.

Nov 11, 2008 | Air Tools & Compressors

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