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High pressure shut off valve will not shut unit off when it reaches 100 psi

Unit just keeps running but will not build much more pressure nor shut down at 100 psi

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Unloader valve gone

Posted on May 02, 2015

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Remove the cover to the electric pressure switch and find a pressure adjustment screw. Loosen to lower and tighten to raise the pressure of when the compressor motor stops.

Posted on May 04, 2015

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Possible bad limit switch. After numerous operations, sometimes the contacts weld together. Sometimes a tap with a screwdriver handle can break them loose, but the switch, if that is the problem, will need to be replaced. On some switches, if the cover is removed, the contacts are visible.

Posted on May 03, 2015

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1 Answer

Will a air compressor that runs at 11.8 cfm at 90 psi run at 10 cfm at 100 psi?


if it is a 11cfm compressor then it produces 11.8 cfm of air regardless of the pressure
pressure has nothing to do with cfm but with the restriction to air flow
for example the tire inflator -air hawk- has a very small cfm but as the tire restrict the air flow the pressure builds up to set pressure on the gauge
so if you want 100psi from the 11.8cfm unit just adjust the pressure switch to shut off at 100psi
Cfm is only important when using air tools as a compressor that is not capable of maintaining the cfm thereby the pressure to run the tools is not a good idea
as an example
a sand blaster that uses 11.8 cfm at 100 psi will not work on your compressor
that unit will require a 20cfm compressor to run it peoperly

Sep 25, 2017 | Psi Air Tools & Compressors

2 Answers

REPLACED THE CONTROL SWITCH W/REGULATOR ON/OFF SWITCH. NOW IT RUNS BUT THE PRESSURE RELEASE VALVE IS POPPING. DID NOT HAVE THAT PROBLEM PRIOR


The pressure switch shuts the motor off when a designated pressure is reached. If you took that unit off then it wont shut off and builds pressure until the safety valve opens.

Jan 09, 2015 | Air Tools & Compressors

2 Answers

My D55141 heavy duty 2gal (7.6L) 150 psi max builds pressure up to around 150 releases pop off valve then keeps running, what causes this problem?


The pressure switch is either out of adjustment or has failed. The compressor should shut off at a much lower pressure than the safety valve (~100 psi)

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/dave_fb2c45146b845cea

Nov 20, 2014 | Air Tools & Compressors

1 Answer

Won't build top pressure an shut off


It sounds like your pressure switch is not set correctly. It is possible it is set too high for the compressor you have.

Sep 23, 2017 | Ingersoll Rand Ingersoll-Rand 80 gal. Air...

1 Answer

Craftsman air compressor model 191.135131 wont build pressure


I can not find a Craftsman compressor with that model number anywhere so here are a couple things to look into. If the compressor fills to 70psi and keeps on running check the valve plate and piston/cylinder assemblies. Check that the valve reeds on the valve plate are not bent, broken or warped from heat. Then check that the wiper (oil less) or pistion rings (oil splash) are not damaged and that the cylinder wall is not scarred up. Any of these will let the compressor fill up to the point where the air pressure leaks past the valves or piston and won't fill any further. If the compressor fills to 70psi then shuts off the problem is in the pressure switch. Some have an adjustment screw or bolt to control when it turns on and shuts off. If you had a drop from 100 to 70 the springs may be weak or broke and you'll have to replace the switch.

May 22, 2012 | Craftsman Air Tools & Compressors

2 Answers

Compressor runs but the air bleeds out think it might be stuck reed


If your compressor reaches the cut-out pressure (or very close) , most likely not reed valves. Usually air leaking when compressor is shut off is result of leaking check valve at the tank. Look for brass valve and remove. Somtimes the valve is repairable if debris is keeping valve open. Clean or replace as needed.

Oct 21, 2011 | Porter Cable C2002 150 Psi 6 Gal...

2 Answers

Compressor 25 psi thats it


I assume it keeps pumping, but doesn't build any more pressure. That is probably bad valves or rings. If your unit has a crankcase breather, and it is puffing alot of air, look for rings. Otherwise valves.

Dec 15, 2009 | Campbell Hausfeld 26 - Gallon Air...

1 Answer

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,...

1 Answer

Troy bilt pressure washer will not build or reach high pressure


check the non-return valves in the pump block. if these are damaged or dirty you pressure will be greatly reduced. they are located behind the 3 lage brass hexagonal caps.

I hope this helps

Sep 04, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

When the pressure hits 100 psi it does not shut off automatically


Replace the pressure valve. It is not sensing the pressure properly and that is why you are having this problem. Why it failed is beyond anyone

Feb 20, 2009 | Flotec TC2104 0-100PSI Pressure Gauge

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