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Compressor pressure will reach approximately 100 lbs. and then the pressure relief valve kicks on and will not go higher or shut off.

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Posted on Jan 02, 2017


SOURCE: The compressor relief valve keeps popping, compressor runs

What pressure is it popping off at? You might have to adjust the pressure switch to a lower setting.

Posted on Apr 01, 2009

  • 1388 Answers

SOURCE: once compressor reaches 125 lbs. pressure, the

Generally, the safety/relief is set to 140 to 160psi. The pressure setting is stamped on the side of the valve. Replace the valve if it will not hold stamped pressure(cost about $6 at Lowes Lumber).The pressure switch is usually set at the factory to 120 - 130 psi. The unloader part of the pressure switch will not release backpressure unless it reaches set cut-off. The 1/4 inch line attached to the pressure switch connects to air discharge tube at the intank checkvalve (brass valve). The safety valve should very rarely release pressure, only when pressure switch malfunctions and allows pressure to reach up to 160psi. The tank will hold over 300psi so dont worry about the 160psi safety. I am not sure about your exact model number or brand, however most small compressors work the same and share similar parts. For manuals to other similar compessors to to Here you will find manuals to dewalt and porter cable compressors. I prefer to use generic replacement parts from or from Lowes Lumber. These parts will cost less than factory replacement. If you need to replace the pressure switch, use SquareD brand from grainger. Watch fitting sizes and pressure range. Good Luck on your repair.

Posted on Apr 04, 2009

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SOURCE: Over Pressure

I suggest trying to adjust the pressure switch, however, it is more likely that the pressure switch is bad and will need replaced. These can be purchased at most hardware stores or After you install it, you will need to readjust it to the pressure it was originally set to so as to not overpressurize the tank. Overpressure is very dangerous so do not use the compressor until it is repaired.
Best wishes!

Posted on May 11, 2009

  • 141 Answers

SOURCE: I have a Porter Cable

I believe you have a head valve or piston ring problem. The parts you replace are suppose to leak. It is a safety feature that doesn't allow the motor to burn up before the pump warms up. Kind of like a soft start feature. If you look on the breakdown part number 107 Kit Valve Plate is what you need to inspect. Sounds like your valve plate is either worn or damaged. If you go into the pump you will have to get part 103 also which is a gasket kit. Or you can try to salvage the old gaskets.
If the valve plate is ok you will need to inspect the rings that go around the pistons. Some times you will get one that gets brittle and breaks off scarring the cylinder. Look for these two things, I am pretty sure one of them is the problem with your compressor.

Posted on Sep 08, 2009

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SOURCE: Relief value releases and will not reset

Likely the check valve is bad or has contamination on the seat. The result is the pressure will bleed back out the compression relief valve which is often as part of the pressure switch.

If the safety valve is the one that is bleeding, then the pressure is set too high at the pressure switch.

Posted on Apr 08, 2010

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The over-pressure relief valve may be defective if the valve is opening before the desired tank pressure is reached. If not, then the shut-off pressure adjustment (if there is one) may be set wrong. You'll need to find out from the manufacturer exactly what static tank pressure the compressor is designed to provide and then determine if it is working correctly. If so, then the relief valve might be defective. DO NOT attempt to defeat the relief valve under any circumstances - it can result in compressor damage or a dangerous tank failure.

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I have a DeWalt compressor and it does not automatically shut off anymore. any ideas

Does it reach the normal cut-off pressure (110-120 psi). If it does then the relief valve must be cutting in to protect the receiver and you need to replace the cut-out switch. If the pressure does not reach the cut-out pressure then:- a. the relief valve is leaking . b. there is a leak in the system somewhere, use soapy water and paint brush to look for leaks. c. the compressor has lost efficiency and needs at least new rings.

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1 Answer


Replace the pressure release valve, Typically they are set to protect at above 130, depending on the specs for your machine. This is a safety device, intended to not normally release...

Always look for leaks when you are working on the unit.

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Compressor initially starts up and fills tank to 120 psi with no problem. Compressor shuts off. When a tool is used the compressor tries to kick back on but hums and won't turn pump. If the "off"...

There is a small valve on the pressure switch that should relieve the pressure between the compressor and tank check valve. Make sure when pressure switch trips, it engages the relief valve and it bleeds the air out. Sometimes the valve itself comes loose and is not engaged by the lever in the pressure switch.

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Pratically new craftsman dry pump air compressor will not reach shut off pressure, reaches 100 and will not get higher it just continues to run.

The compressor valves may require replacement, the drive belt is loose, or there is a leak somewhere on the tank--usually the safety release valve. Hope some of this helps!

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Craftsman 3 gal., 1.5 hp air compressor: won't auto shut off, builds only 40 lbs pressure, air leaks from the 2 holes in oil filler cap?

The compressor will not auto shut off until it reaches the preset pressure which is usually around 100-130 psi - your problem is leakage of air from the oil filler cap suggesting that you have a failed internal valve.

Sep 24, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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Locks up on restart untill the pressure. is down around 50 lbs.and kicks out the breaker

The pressure bleed valve is not working when the compressor shuts off. It is supposed to drain pressure from the compressor air line to the check valve and pressure regulator switch so that the compressor restarts with low pressure in the output line.

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Slow to impossible to reach 150 lbs.

The back pressure valve may have some carbon build up o it, or the spring may be weak pull it apart and lightly sand the disk rinse with gas and lightly oil and reinstall.

Aug 02, 2009 | Air Tools & Compressors

1 Answer

Cycling compressor

The pressure switch will shut off when the set pressure is obtained. Usually about 100 to 120 lbs. If the compressor stops at lower pressure than mentioned you may try to adjust the pressure by looking under the switch cover for adjustment screw/nut.(no more than a few turns) Increase pressure by increasing spring tension. Quick cycling is usually caused by air leaking from tubing, drain valve or check valve. After compressor shuts off unplug it from the outlet and spray soapy water on all fittings and drain valve. Repair leaks and test for quick cycling, however the compressor should reach 100-120 before shutting off. Some small compressors have a thermal reset but that usually takes a few minutes to reset. Pressure switch is defective if it shuts off before setting mentioned. Enjoy

Dec 11, 2008 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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