Question about Square D 9013FHG14J52M1X Air Compressor Pressure Switch

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I have a square D air compressor switch type ghg3 and ineed to know how to adjust the preesure settings the label that was on the inside of lid is missing and there is 2 screws that i can adjust and dont know witch one is for the high or low pressure

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  • Square Master
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There are two pressure adjustment screws; one will adjust the cut-in and cut-out pressure, the other will only effect the cut-out. On a Square D switch, these screws are noted by size of spring (cut-in and cut-out larger spring) and (cut-out only smaller spring). To increase the cut-in and cut-out, turn screw with larger spring clockwise, to decrease turn counter clockwise. To increase the cut-out pressure only, turn screw with small spring clockwise, to decrease, turn counter clockwise. Square D does not include adjustment instructions under lid. These switches are pre-set according to model number. For different pressure ranges, they actually use a different set of springs. You could, however adjust few lbs higher or lower. Good luck

Posted on Mar 31, 2011

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  • Contributor
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Screws are preset for auto cut off. don't recommend changing screw setting

Posted on Mar 31, 2011

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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

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1 Answer

Compressor reaches 125 psi but does not shut down


Depending on how old your compressor is, usually inside the pressure regulator cover are instructions on how to adjust the turn-on and shut-off pressures. If not, it usually invloves turning a nut or screw to lessen the pressure on the spring that keeps the contacts closed. Try adjusting the pressure down. If it won't come down to a safe level you will be better off replacing the pressure switch. The number you give above is the Campbell-Hausfeld (they are Husky) part number for the pump and motor assembly so I don't know which CH pressure regulator you need. They are easy to find and easy to replace.

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1 Answer

Switch will not shut off


Make sure you don't contact the electrical power inside the switch cover.
Make sure that you have an accurate gauge to test the compressor.
Adjust the switch to the original factory setting.
If the original setting was 100 psi, for example, make sure the gauge is reading at least 100 psi while the compressor is running. If the pressure is over 100, turn the nut that is over the larger spring counter clockwise until the compressor stops. This will lower both turn on and turn off pressures. The nut over the smaller diameter spring should probably not be adjusted.

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1 Answer

How do i adjust air pressure cut out


Square d recommends that the pressure switch be adjusted to specifications of the particular switch (which is sold in pressure ranges preset at the factory). The switch will be erratic it adjusted out of the factory setting range.
From Square D: (adjust the desired cut-in pressure first, then cut-out)
Cut-in: The large spring controls the cut-in pressure. To make adjustments, turn the nut clockwise (compressing the spring) to raise the cut-in point or counterclockwise to lower the point of cut-in.
Cut-out: The small spring is the differential adjustment and controls the cut-out pressure. To raise the cut-out pressure turn the small nut clockwise (more differential); to lower the cut-out pressure turn counterclockwise.

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1 Answer

Sanborn Blackmax B3511 The part that has the gauge on it. This part is a black square about 1.5" square. Off of it is the handle to turn the air off and the hose connects to it. The black square is...


i assume your are talking about the pressure regulator. if it won't adjust to raise and lower the outlet pressure it is broke. you will have to replace it with an in kind type.

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1 Answer

Need to set low level on my compressor


That would depend on the type of pressure control switch it had on it, but all of the ones I've ever seen have it near the high pressure adjuster under the pressure switch cover- VERY HIGH VOLTAGES- RISK OF INJURY OR DEATH- UNDER PRESSURE SWITCH COVER WITH UNIT STILL CONNECTED TO POWER-

On the common switch used (A condore mdr 5) the differential is adjusted by DEPRESSING the nob & turning it.

On MDR 4 the adjuster is directly behind the high pressure adjuster. it is a flat bladed screw attached to a spring-screw in to increase cut in pressure.

You can also get pressure switches with a higher cut in pressure.
In Australia from a company called Ross Brown Sales in N.S.W

Hope this helps
Regards Andrew

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1 Answer

How to rewire a pressuer swich for a well


The switch logic is the same, but will the AC switch design allow it to be operated at the fairly low pressures commonly used in water systems (35-60 PSI)? You might get it to work by changing the coil spring to a lighter spring of the same dimensions. Make sure to run a pressure gauge on the water system, but protect it from freezing if that is a problem. The other criteria is whether the switch has 2-pole contacts for 230 volt service. Usually, the wiring instructions are on a label inside the cover. Good luck!

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1 Answer

I've messed with the settings on the three springs inside the mdr21 pressure switch and don't know how to adjust them correctly and which does what? I'm getting max pressure at 130psi and blow off to...


Normally you can find the setting instructions on the underside of the switch cover.
In almost all compressor switches you will find two adjustment screws. One is for the "Cut-in/Cut-out" or "Cut-on/Cut-off" psi. The other for "Cut-out" psi only. If there is no label the easiest way to tell the difference is by the springs. The "Cut-in/Cut-out" is the larger of the two springs.

Start by turning the smaller or "Cut-out" screw counter-clockwise. This will decrease the Cut-out psi. I would say to back it off 1 1/2 or 2 turns. Now run the compressor and check where your max psi is. Your target is 105psi if your present "Cut-in" psi is 80psi. Once you have that setting at 105psi, move to the larger screw or "Cut-in/Cut-out" adjustment. Turn the screw clock-wise making 1/4 turns adjustment until you reach the 100/125 psi.

By blow off I assume you mean the unloader valve. There really isn't any setting for the unloader because it's built in to the valve itself.

Since there are some variations for this switch please let me know and I'll explain how to make the adjustments for your type.
Or if you are unclear about anything here just let me know and I will be happy to help you out.
Hope this helps.

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1 Answer

Need to adjust on and off steeings


Usually you cannot do this... but this is what an air regulator is for. Using the regulator, you can set the desired working air pressure required for your task, despite the ON and OFF settings of the compressor.

Use your regulator (or fit one) to lower working pressure of the air.

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1 Answer

Cut off switch problem


The pressure switch will trip off when the compressor reaches the rated setting (usually 120 ~150psi). If the compressor keeps running untill the safety pops releasing air (usually about 160psi) then the switch is most likely problem. I use SquareD switch from WWW.Grainger.com. However if the compressor keeps running but never pops the safety and only reaching around 90 to 100psi, then you could have several other issues including: leaking fittings (check with soapy water), worn cylinder and piston (on oilfree compressor examine cylinder from below and look for scratches), leaking valves on oil type compressor. Please email with your finding and any questions Good Luck

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