Question about Dewalt D55141 2G TRIM COMPRESSOR

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My compressor builds air but want cut off it pop the safety valve and dumps the are till it reaches 50 lbs

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You need to adjust your pressure switch to a lower value.

Posted on Apr 16, 2015

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Check the pressure switch if it is set out of range, lower the setting and while you are there, check the switch contacts to see if they are welded together.

Posted on Apr 18, 2015

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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.

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I have a vt631401aj campbell hausfeld compressor. when it builds pressure to 135 psi, the compressor shuts down and immediatly starts dumping air until it goes down to 90 psi. It then stops dumping the...


John: I had a similar problem with a brand new CH-made compressor. The problem was not with the unloader valve, but with the check valve located where the air from the pump enters the tank. The check valve was not seating correctly due to brass filings from manufacture. The defective check valve was allowing air to escape back the wrong way from the tank to the pressure switch and through the unloader valve. This backflow from the tank would start to happen when the pump stopped after reaching high pressure. The back flow would continue until the pump restarted at the low pressure point. This cycling would continue as you described. Once I cleaned the check valve, everything (including the unloader valve) started working correctly. I hope this helps. And remember, don't work on these when they are under pressure and always wear safety glasses.

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T30 model 242 Safety relief valve pops off at 50-60 lbs pressure. Put on a new one and still the same problem. Don't know what to look for next. Normal cut out is at 150-175. Thanks


From want you are describing sounds like the high pressure valves are leaking in the HP Head. there are 2 safeties on this unit . If the safety that's lifting is between the low and high pressure cylinders it's hp valves leaking. If the tank safety is lifting at 50-60 psi It should be replaced. It is a 200 psi safety.

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My compressor keeps slowly building air after it has reached cut out pressure of 170 , keeps building till it reaches 200 and high pressure valve opens ....


It is not opening the bypass valve all the way see if there is a adjustment so that it pushes the valve open farther when it slows down.

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Craftsman compressor wont build up air after 25 lbs


The pressure switch is defective. You can order a new one from http://www.searspartsdirect.com/partsdirect/index.action. If the compressor builds up to 25lbs and will not shut off, then it could be the safety valve.

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After my Hitachi ec12 compressor pumps to maximum pressure it shuts off and immediately starts dumping air out of the part name "Joint" which is item 60 in the parts list. It will dump until the motor...


The problem that you describe is most likely the in-tank check valve (brass or chrome valve where air enters tank ). Easy to check. Run compressor till you have about 60-80 lbs in tank then shut-off / unplug for safety. Remove the small hose (1/4) at the check valve and verify that air is leaking from valve. If leaking remove cap from checkvalve and look at inner plastic valve for cracks. Replace as needed then re-test for leaks. You can be creative in making the inner plastic valve (teflon or nylon ball 1/2 - 5/8 ) or replace the whole valve. (inner part not sold separately) Good luck with your repair and post again if you have a question.

Jun 24, 2010 | Hitachi EC12 Portable Electric 2hp Air...

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Air compressor's safety release valve pops open.


You need to replace the pop it valve with a preset on. they are cheap and readily available. You could adjust yours with a proper steup. But it may need new parts just replace it.

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I have a clarke hunter 2.5 50 ltr pump. when the pump reachs full pressure,instead of switching onto standye until more air is needed it dumps the air out from the under the on off switch housing.


well their is safety air pressure valve make sure it good which 99% they are good is pressure too high check the regulator is it set to high. that is. extra air and lots of regulators do dump air any ways so that's no big deal, it is normal

Jul 04, 2009 | Air Tools & Compressors

1 Answer

Pressure switch out of adjustment


Before you adjust the perssure switch, make sure that the intank check valve is not leaking pressure back to the pressure switch after it cuts off at 140psi. The check valve should hold pressure at 140psi. Follow the discharge airline to the tank to find the checkvalve (either chrome or brass with large cap). To check for leaking valve, run compressor till shut-off at 140, then unplug the compressor from wall and remove the 1/4 air fitting at the checkvalve and check for leak. If leaking, replace valve and leave the pressure switch at present setting. You should be good to go. Good Luck with your repair and email if you have questions.

Apr 03, 2009 | Hitachi EC12 Portable Electric 2hp Air...

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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