If you’re wondering how to adjust air compressor pressure switch control valve, you’ve come to the right place. We have general guidance on adjusting any air compressor pressure switch cut-in, cut-off and pressure differential.

I’ve also got a list of compressor pressure switch adjustment procedures that are specific to air compressor brands and models that users have asked about in the past.

If you have any questions about adjusting the pressure switch on your compressor, leave a comment below.

Table of Contents

How do I adjust air compressor cut in pressure?

I run a mobile service. my compressor holds 120 lbs. when it drops to 90 lbs it kicks back on. I want it to drop to 50 lbs before it kicks on. how do i adjust the cut in pressure on my compressor using the air compressor pressure switch?


Response by Bill

Ed, the thing that controls the air compressor cut in pressure is the pressure switch. It also controls the compressor cut out pressure level too.

I’m puzzled as to why you feel the need to reduce the cut in pressure to 50 PSI?

Wouldn’t the same thing be accomplished by turning your regulator down to 50 PSI?

Regardless of the pressure in the compressor tank then your air tools would then only see that 50 PSI, would use less air because of the lower pressure setting, and thus would reduce the frequency of compressor cut in.

If you must change your pressure settings, and I generally advise against it, as they are factory set for good reason, then one of the two threaded shafts with the nuts pushing down on springs inside your compressor pressure switch will adjust the cut in and the other will adjust the compressor cut out pressure levels.

That is assuming that your pressure switch is accessible, and has those two springs I spoke of, since you don’t mention the make or model of your air compressor.


How to adjust the compressor pressure switch down?

by Terryl Cozart
(Tupelo, MS)

I want to adjust the pressure switch down.

I have a Dewalt D55168, 200 PSI 1.8 HP 15 Gallon tank I picked up used the other day. Everything seems to run just fine except it hasn’t cut off on it’s own. I got chicken and cut it off manually. It has reached 200PSI, but it won’t cut off. This thing scares me a little. I would like to cut the pressure down to 175 or so. This seems a little more manageable to me, I just don’t know how or if you can. Any help you can give me would be greatly appreciated.

DeWalt D-55168 model air compressor
DeWalt D-55168 model air compressor

Response by Bill

Hello Terryl, very nice to hear from Tupelo. Thank you for visiting this site and for writing in.

I suspect that your pressure switch has failed on the high pressure cut-out setting.

Yes, you can adjust the cut-in and cut-out pressure level yourself, but I think that with your switch you will be trying to adjust it in vain.

You are quite correct to be intimidated by the compressor. I don’t know of many smaller that exceed, say, 175 PSI at the high end and this one is rated for 200 PSI.

Do yourself a favor too, and once the pressure gets up to 170 PSI or so, manually toggle the PRV by pulling on the ring to make sure that it’s free. In the event that the pressure in your tank reaches the PRV threshold, it will open and vent the air to prevent pressure rupture. Manually toggling the PRV open and closed will satisfy you that it will actually work when you need it.

Watch the pressure gauge when you close the PRV and let it get to 210 PSI. Doesn’t shut off still?

Change your pressure switch. I think that’s your compressor problem.


Thanks
by: Terryl

Thanks Bill,
I appreciate the response. You said just what I was thinking. Nice to be backed up.


Step by step instructions for setting the cut out pressure on DeWalt D55168 air compressor

Pam Columbus

Can you please give me step by step instructions for setting the cut out pressure on the DeWalt D55168 air compressor. I would like to set it to 150 psi.
The instructions provided were very vague.


Response By Doug in s.d.ca

Depends on whether you have a type 1 or type 3. If not sure, pls send a pic of it with cover removed.


How to adjust pressure switch setting of Kobalt compressor model K7060HFV

by stratton whitaker
(st louis, mo, usa)

How to adjust pressure setting of a Kobalt K7060HFV air compressor? I have a Kobalt K7060HFV air compressor. Works great, but the pressure is set at 80psi. How can I adjust the pressure up to 110psi?

Kobalt K7060HFV air compressor
Kobalt K7060HFV air compressor

Hello Stratton.

You say the pressure is set at 80 PSI? Can you tell me where on your compressor is that pressure setting set? In other words, is it the pressure switch setting, or is it the outgoing air regulator setting?

To adjust the compressor system pressure requires re-setting the pressure switch, and I don’t recommend that.

If it’s adjusting the downstream pressure to your tool, that’s done with the air regulator.

If you aren’t sure, please add a comment and we’ll dig further into this.

Bill


How do you adjust the cut-off pressure setting in Husky compressor?

by allan keller
(dawsonville ga)

I have a Husky 60 gallon stationary air compressor Model #C602H that i have adjust the cut-off setting. the setting is too high for my equipment.


New Husky C602H air compressor
New Husky C602H air compressor

Adjust Model #C602H cut off setting
by: Bill

Allan, your Husky air compressor is configured to run ideally at the cut in and cut pressures that came with the OEM pressure switch.

Reducing the cut out pressure setting will really only result in increased wear and tear on your compressor.

I suggest that you leave the pressure switch alone!

What you need to do is adjust the pressure setting on your air regulator to the minimum pressure that your air equipments operates best at.

In this way you will have plenty of air to run your tools – assuming the air tool demand is less than what the air compressor can deliver – and at the same time your compressor will cycle less frequently which is good for reducing time loss and cost in compressor maintenance.


Thank you
by: allan

Thanks Bill this was good information


How to Adjust Compressor Cut Off pressure on Ingersoll Rand 375 Compressor?

by Rory Mahaney
(Fairbanks, Alaska)

IR 375 Diesel driven, screw compressor; pressure switch adjustment:

Compressor runs great.

IR 375
IR 375

Recently replaced pressure tank filter to resolve blotter test issues (oil in the blast air) and it fixed the problem.

I want to set the performance pressure to 145psi. Currently, I have to keep the air outlet valve open to prevent the pressure release valve from popping off at max pressure on the gauge (150psi) and spraying hydraulic fluid everywhere.

How do I adjust the pressure cutoff, and is there anyway to test the electronic pressure sensor located near it in the same line on top of the hyd/air pressure tank?


Adjust pressure cut off IR 375
by: Doug in s.d.ca.

Before getting to that, have you cleaned the PRV ?

If not, it’s almost certainly popping prematurely.

The pressure sensor is just a pressure sensitive resistor, so the easiest way to check that is with another gauge on the separator tank or receiver.


PRV
by: Rory Mahaney

Doug,
I have previously replaced the PRV (150psi), as this was my first line of resolution.

I know that the valve on the right in the pic above, is the cutoff adjustment, just wondering what the proper procedure for adjustment is, as I have adjusted the top screw in and out, resulting in no change of the compressor shutting off at a lower pressure than that of the PRV.

Is there a technical name for this “pressure adjustment valve” that I am not aware of? If I knew that, it is possible that I would be able to purchase a new one, assuming the current one has worn out.


Pressure cut off IR 375
by: Doug in s.d.ca.

I think perhaps the reason the adjustment is not working, and given that you have to leave the outlet open, means that the thing is not loading/unloading properly, as in the load valve is stuck.

After you’re sure that’s OK, then the adjustment will probably work, too, unless something else is stuck…


Thank you
by: Rory Mahaney

Thanks so much! I’ll check the unload valve and go from there.


Pressure cut off IR 375
by: Doug in s.d.ca.

Sure. hope I helped.

Let us know how it turns out, OK?


FAQs

Can you adjust pressure switch on air compressor?

Yes. Typically the pressure switch allows for the adjustment of the cut in / cut off pressure to ensure you have sufficient pressure and volume of compressed air to suit your needs.

How do you know if the pressure switch is bad on an air compressor?

There are multiple tell tale signs that an air compressor pressure switch is faulty. Inconsistent cut in and cut off pressures can often be a first sign – or the compressor not starting at all. For more information on troubleshooting pressure switches, see this detailed air compressor pressure switch troubleshooting guide.


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