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

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I have a craftsman compressor model 919.162120. Started out when the compressor got to desired pressure it would cut off and come on in a couple of second intervals. Now it wont get above 40 psi and does the same thing, on and off and so on.

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The pressure switch is out of adjustment. You can remove the over and adjust it to get the desired control. Just turn the nut a little at a time and watch the effect it has. Turning clockwise (CW) will raise the cutoff pressure.

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Posted on Jul 02, 2009


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Posted on Jan 02, 2017


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I have a a old Gibralco compressor when i cut it on it starts fine when it reaches desired pressure it stops and restarts until i kicks the breaker what can i try

i suspect that the start/run capacitor is faulty or the centrifugal switch in the back of the motor is faulty

have an accredited electrician check the motor , capacitor and the pressure control switch
the air leak at the head is a faulty non return valve in the compressor line to the tank
available at good tool shops for around $60.00

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I have a craftsman air compressor model # 921.16472S. When it got to cut off pressure the bleed valve started blowing. I changed the pressure switch and bleed valve then lowered the cut off pressure. When...

Either the pressure switch is not shutting off when reaching the desired pressure or the pop off is either the wrong one or it is bad. Some blow off at lower pressures for single stage air compressors while others blow off higher for 2 stage air compressors.

Feb 11, 2014 | Craftsman Air Tools & Compressors

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I have a Craftsman 2-gallon 1.5 HP air compressor, Model No 921.152100. The last time I used it it worked great. I just tried to use it and it doesn't work. I checked the connections and found the pressure...

Is there pressure in the tank already? The reset is usually on the end of the motor.
The pressure switch, a diaphragm pushes against an adjustable tension spring. Less spring tension cuts the motor out at lower pressure, more tension at a higher pressure. Has this adjustment been used? It may have a second adjustment, either nut or screw, that adjusts the pressure differential between cut in and cut out.

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1 Answer

Craftsman 1 HP 8 gal vertical compressor.919

Sounds like the unloader valve is not working properly. The unloader typically is at the end of a tube going to the pressure switch. The unloader is tripped when the pressure switch cuts off. The purpose of the unloader is to bleed the pressure from the cylinder when the compressor cuts off so the next time the compressor cuts on it will be starting in an unloaded condition.
when the compressor cuts off you should hear a discharge of air for about 3 to 5 seconds if the switch is working properly. The unloader can be adjusted if necessary by loosening the jam nuts and adjusting the unloader towards the lever on the pressure switch.

Apr 05, 2010 | Air Tools & Compressors

1 Answer

Craftsman compressor model no 919.153160 Runs fine, but does not build up pressure past 60PSI. Will not shut off as the pressure does not reach to cut off pressure. Where to start looking>

you have a valve problem in head /or leaking head gasket /or a bad leak in system
take off breather and see if it is pulling air it sould not be pushing back
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Dec 30, 2009 | Craftsman Air Tools & Compressors

1 Answer

How to test a pressure sensor switch on a air compressor

Hi, W/D here.

To accurately test a switch, it has to be removed from the compressor and tested by raising the pressure and lowering it with air supplied from a known, good regulator. The trip pressures are then noted and adjusted.
The quick and dirty way of "getting close enough" is a little different. Start the compressor, and when it gets to your desired cutoff pressure, pull the plug. Adjust the HP spring untill the contacts trip out. Now, with the compressor still unplugged, drain the pressure off of the tank until you reach your desired cut in pressure, and close the valve. Adjust either the LP cut in or the differential pressure adjustment to set the cut in pressure. The contacts will pull in. If you adjust the cut in pressure with the diff pressure setting, the cut out pressure has to be challenged and set again. Whichever method you follow, you always need to check the upper and lower settings after each adjustment.
Best regards, --W/D--

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I started it but when it got up to max 120 it cut off. What should i check? Or do you know where I can get a manual?

Unless I am mistaken, all compressors, with the exception of continuous run, cut off when they reach a pre set max pressure

Jul 10, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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

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