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Posted on Aug 24, 2009
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Problem with pressure switch is not shutting down compressor and the safety is blowing

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  • Expert 76 Answers
  • Posted on Aug 25, 2009
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Joined: Jun 22, 2009
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YOUR PRESSURE SWITCH IS INSIDE A LITTLE PLASTIC BOX AND HAS A THREADED ROD WITH A SPRING AND NUT AT THE TOP NOW THIS PART IS DIFERANT ON DIFERANT BRANDS THAT NUT CONTROLS THE PRESSURE CUT OFF IT MAY HAVE TO TIGHTEN TO BUT IT IS MY EXPIERENCE THAT MOST OF THEM YOU LOOSEN IT TO CUT OUT AT LOWER PRESSURE OR YOU MAY HAVE A BAD RELIEF VALVE IF YOU HAVE A GOOD GAUGE YOU SHOULD BE ABLE TO TELL NOW THIS IS ALL BASED ON SOME ASSUMPTIONS IF I AM WRONG OR MISSED THE MARK GET BACK TO ME WITH MORE DETAIL AND WE CAN GET THIS SOLVED THIS IS ONE OF THE SKILLS THAT I AM EMPLOYED AT I DO ALL REPAIR WORK ON THE 8 AIR COMPRESSORS AT THE MANUFACTURING FACILITY I WORK AT

  • Anonymous Aug 25, 2009

    YOUR PRESSURE SWITCH IS INSIDE A LITTLE PLASTIC BOX AND HAS A THREADED ROD WITH A SPRING AND NUT AT THE TOP NOW THIS PART IS DIFERANT ON DIFERANT BRANDS THAT NUT CONTROLS THE PRESSURE CUT OFF IT MAY HAVE TO TIGHTEN TO BUT IT IS MY EXPIERENCE THAT MOST OF THEM YOU LOOSEN IT TO CUT OUT AT LOWER PRESSURE OR YOU MAY HAVE A BAD RELIEF VALVE IF YOU HAVE A GOOD GAUGE YOU SHOULD BE ABLE TO TELL NOW THIS IS ALL BASED ON SOME ASSUMPTIONS IF I AM WRONG OR MISSED THE MARK GET BACK TO ME WITH MORE DETAIL AND WE CAN GET THIS SOLVED THIS IS ONE OF THE SKILLS THAT I AM EMPLOYED AT I DO ALL REPAIR WORK ON THE 8 AIR COMPRESSORS AT THE MANUFACTURING FACILITY I WORK AT

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Bostitch CAP2000P-OF 6 gallon compressor
This is an easy fix.. you need an new safety valve or a new switch.

If the safety valve releases pressure before the max pressure replace it.
the switch has a cut in pressure of 120 psi (this means compressor will start when pressure falls to 120 psi.
The cut off pressure is 150 psi. This means the unit will shut off at 150 psi.
You need to watch supply pressure to see if it exceeds 150 psi. If it does replace switch.


Safety Valve Part Number:AB-9415379
Pressure Switch Part Number:AB-9415626
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I don't find that model in my database but if the safety valve is popping it is one of only a few issues:
1) The safety valve is weak or defective - run the compressor and watch the pressure gauge and see when it releases. Most compressors cycle on at around 90psi and off at around 120psi - the relief valve is usually set at 130-140psi. If it releases before 130psi I would replace the safety valve.
If it blows off above 130psi...
2) The pressure switch is defective if the unit doesn't shut down at it's labeled pressure (most are 120-125psi)
If it runs beyond the labeled pressure and blows off then replace the pressure switch.
3) If the unit has a pilot valve instead of a pressure switch and the unit builds up past the labeled pressure then you can follow these instructions to adjust https://www.youtube.com/watch?v=6CZ9Hznh6EI
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Pressure problems can be several pressureline leaks


If an air pressure switch (pressostat) does not return replace the pressure switch a gray colored or white or black colored box with the powercables comin to and the power knob on it red black gay or other color. that is the problem itself in this case . the mechanic jumped not up it hangs , best is to replace the complete part.

If the compressor filling the tank and when its reached the pressure and it blow from out the safety valve then the pressostat its too high adjusted. there is a max pressure on the valve to read is it blow off below the max replace the safety valve.

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Depending on the pressure in the tank when the safety valve releases,the problem is likely your pressure switch. If the pressure is at or above 160 psi when it blows, then the problem is the switch.If the pressure is lower, then it is likely a faulty safety valve. There are about 8 versions of this machine. check on dewalt service net for the correct part. you may need to check ebay if the part is nla thru dewalt.
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Porter Cable Pancake compressor builds pressure, but will not shut off when max pressure is achieved. Pressure switch is NOT the culprit.
Most P/C compressors shut off at 150psi. If the pressure switch is bad, the pressure will rise until the safety pops. If the safety is not opening, then most likely the cylinder / piston ring is worn to the point that pressure will not increase past safety range (cylinder could be scratched near top ). If cylinder and piston are ok, then air is leaking somewhere (check all joints with soapy water). Good luck
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D55141 Electric 2 gallon Dewalt Emglo compressor won't shut off. It builds pressure past the max rating 150 psi and blows the intended safety feature, pressure relief valve as it should, but then...
Hi
your pressure switch is bad. so it isnt cutting off the compressor. the part number is N003306SV and can be obtained from Dewalt on Servicenet.
Detail

Good luck and hope this helps
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I HAVE A CF2600. THE COMPRESSOR BUILDS PRESSURE BUT WILL NOT SHUT OFF , THEN BLOWS THE SAFETY VALVE.
I recommend replacing the pressure switch.
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IT SOUNDS LIKE YOUR COMPRESSOR IS NOT UNLOADING WHEN IT SHUTS DOWN. YOU SHOULD HEAR AN AIR RELIEF SOUND TYPICALLY ON THE SIDE OF THE PRESSURE SWITCH WHEN IT SHUTS DOWN. ITS A SMALL VALVE WITH A TIRE VALVE THAT THE LEVER HITS AND RELIEVES THE PRESSURE FROM THE DISCHARGE LINE AND THE TOP OF THE PISTON.

YOUR CHECK VALVE COULD BE BAD LETTING PRESSURE BACK UP BUT IT WOULD BE BLOWING AIR OUT ALL THE TIME WHEN SHUT DOWN.

IF YOU THINK THE VALVE OR SWITCH IS WORKING AND WANT TO CHECK IT, LET THE COMPRESSOR BUILD UP AND SHUT DOWN, LISTEN FOR THE AIR RELIEF,IF IT DOESNT THEN CRACK THE DISCHARGE LINE AND SEE IF THERES ANY PRESSURE, MANUALLY RELIEVE THE PRESSURE THEN USE SOME AIR AND SEE WHAT HAPPENS. REPAIR VALVE ON THE SIDE OR CHANGE PRESSURE SWITCH $30-40.00. HOPE THIS HELPS. PLEASE REPLY. JODY
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