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Compressor won't shut off at upper limit runs until safety valve opens

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Need to replace or adjust the pressure regulator

Posted on May 10, 2010

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I have Ingersoll rand ssr Hp40 SE compressor.. I can't set pressure above 95 psi if it have discharge pressure 143psi..what should I do for set this? If pressure touches 95 psi automatically vavle...

The tank, compressor head, and components need be rated at what you want set the compressor unit pressure to, the safety valve will keep from exceeding the lowest of those limits. If you suspect the safety relief valve needs replacing because it has weakened, then replace the safety valve with one OEM pressure values

Aug 09, 2017 | Ingersoll Rand Air Tools & Compressors

1 Answer

How to reset the compressor

  1. Remove the screws from the plastic shroud on top of the compressor near the air outlet valve. Use a screwdriver to remove the screws. Lift the shroud from the compressor to reveal the upper and lower pressure limiter adjustment screws. The screw closest to you is the lower, the one farthest away is the upper.
  2. Turn the compressor on and allow it to charge. Make a note of the pressure on the pressure gauge when the compressor turns off. Pull the air release valve to release pressure from the tank. Look for a metal and plastic valve near the air outlet with a metal pull ring through it. Watch the pressure gauge and make a note of the point at which the compressor turns back on.
  3. Consult the tool manual or tool manufacturer's website for the tool you use most often. Look for the optimum pressure range. You may also find this on a printed label on the tool itself. It should indicate the best pressure for operating the tool, for example, "Works best @ 60-120 psi." Psi, which stands for pounds per square inch, is the same measurement you wrote down from the pressure gauge.
  4. Adjust the lower limiter control screw by turning it clockwise to increase the pressure, or counterclockwise to decrease it. Adjust the upper limiter control screw in the same way. Recharge the compressor, noting when it kicks off. Release pressure and note when it kicks on. Adjust the screws as needed until the compressor consistently maintains optimum pressure.
  5. Replace the shroud on the compressor. Replace the shroud screws and tighten them with a screwdriver.

Jul 15, 2015 | Air Tools & Compressors

1 Answer

Duo Therm A/C (2009 Sabre RV) won't shut off

bad compressor relay on control board. The relay is not opening the circuit, allowing the compressor to stay running when unit is turned off. This overheats the compressor and opens a thermal disk shutting the compressor off. When thermal disk cools down, the compressor restarts under load and trips breaker.

Jun 06, 2013 | Dometic Rooftop RV Air Conditioner

2 Answers

Compressor runs and compress air,but when air setting is depleted compressor will not start to compress more air.If you waite it will start some times do think this might the compressor switch

If it doesn't try to start, then it could be the pressure switch. Another suspect could be the thermal overload on the motor. The motor (or just the overload) might be overheating and shutting the unit off, then allowing it to restart when it cools.

Is there any humming, or does it blow the breaker? When ot shuts off, do you hear a brief hiss of air?

If there is humming or breaker blowing on restart, or no hiss of air at shutoff, the pressure switch unloader valve is probably bad. If the air blows off, and there is no humming, and the compressor doesn't reliably start, it is probably the pressure switch. If pressure drops too low, give the pressure switch a tap with a screwdriver. If it starts then, the pressure switch is your problem.

Jun 02, 2011 | Air Tools & Compressors

1 Answer

I have an older 33 gallon horizontal craftsman compressor. In December I turned the compressor on in my unheated garage when the temp had been in the 20's for days. It seemed to run normally at first. Then...

It sounds like the pressure safety valve could be acting up. It is designed to open when the tank pressure it too high and they don't always reset until the pressure is down to nothing. Some models have them included on the gauge manifold and some on the top of the tank under the cover. It is also possible that the upper limit on the motor switch is set a little too high which would also cause the valve to "pop" before the compressor shuts off.

Mar 18, 2011 | Craftsman 33 gal Air Compressor 6 hp...

1 Answer

I have a compressor that will run but if it gets up to pressure the tank will bleed all the air out. I turn the compressor off around 90 psi and I can use it then I have to turn it on then off before 120...

If I understand correctly the safety valve, item #64 on the parts diagram, is opening at 120lbs and not shutting until the tank is drained. If that is the case you most likely have a bad safety valve, part #881-493 which is available from The non-return valve is basically a check valve that prohibits the flow of air from the tank back to the cylinder. I hope this helps!

May 21, 2010 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

Compressor won't shut off at upper limit runs until safety valve opens

The pressure switch is either set at too high a pressure, or it is not working properly. Has it been replaced recently? There is a possibility that the wrong switch was installed, check this as well.

Mar 16, 2010 | Electrical Supplies

2 Answers

Hi I have a Dewalt d55141 emglo contiues to run

Open the shut off switch box and adjust the cut out pressure.

Nov 17, 2009 | Dewalt & 2HP Hand Carry Heavy Duty...

1 Answer

I have a similar problem with the same compressor.

there is a check valve on the piston that has gone bad ,, i had the same problem on mine but a much bigger compressor and it was in the head on the piston on the intake side,, you need to get a gasket set and the valve and follow the directions and you will be fixed till the nest time

Jun 08, 2009 | Dewalt & 2HP Hand Carry Heavy Duty...

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