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Compressor pumps air but shut off at around 120psi

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Hi,
There are very few air compressors that are safe to operate above that pressure...

heatman101

Posted on Sep 30, 2010

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I have a mech power 2hp twin tank air compressor..m90002. It only generates to 120psi then shuts off. Can I get it to go up to 150psi? If so how? Thanks


It is what the max pressure is to handle before the safety valve can have if it concept is for 10 bar then you have a 10.5 bar safety valve or if its 8 bar its 8. . 8.5 look at the tank itself its in most case there you can read what it can handle.

May 18, 2016 | Air Tools & Compressors

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Hello I have a 20 gallon kobalt model 033204. I just replase pressure switch but does same thing. When I tur on the compressor jus build 50 psi and shuts off.


This usually occurs when the motors internal thermal / amp breaker opens due to overload or weak breaker. Use an amp gauge to test for too much amp draw. If amp draw is normal, then problem could be the in-tank check valve leaking pressure back to the pump overloading the system, or weak capacitor or weak breaker. Bypass the breaker temporarily if the amp draw is normal to test system. Good luck

Oct 31, 2015 | Psi Air Tools & Compressors

1 Answer

When it hits 120psi in the tank it won't shut off it keeps pumping till the relief valve blows. whit do I need. Please asap


There is a pressure sensor that tells the compressor when to shut off. It is defective and needs to be replaced.

Feb 04, 2015 | Air Tools & Compressors

1 Answer

When my compressor reaches 120psi it shuts off but air comes out of the regulator. I replaced the regulator and it is still leaking air when it stops. When it reaches 90psi the pump starts again. It does...


The air is coming out of the pressure switch but the problem is the tank check valve. The tank check valve is on the tank where the large line from the pump feeds into the tank. There is also a smaller line, either plastic or copper, from the check valve to the pressure switch. When the pump shuts off the check valve is supposed to close and the pressure switch opens a valve that lets the head pressure bleed off through the small line. This lets the motor start the next time without any pressure in the head. If the check valve isn't closing properly the air will leak out as you describe.

Aug 19, 2012 | Air Tools & Compressors

1 Answer

I have a central pneumatic aircompressor with a 21 gallon tank.It pumps up to 120psi then pops off down to 80psi and goes back to 120psi...back and forth... never stoping...could it be a bad pop-off valve?


I would first find out what pressure the compressor is supposed to shut off at. If it is supposed to shut off at lets say 110 then the pop off valve is doing its job you have to reset the pressure switch so it shuts off less than 120 pounds.

Mar 16, 2011 | Air Tools & Compressors

1 Answer

My air compressor won't get past 60psi but keeps running and isn't leaking air anywhere when I shut it off


Your problem lies with the valve plate and/or piston & cylinder. If one or more reed valves on the valve plate are cracked, bent or broken; pressure will only build to a certain point. If either the ring on the piston is damaged or the cylinder is badly scored it will not be able to compress air beyond a certain point. Unless the tank pressure reaches 120psi to 130psi the pressure switch will never turn the motor off.

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Electric motor labors when restarting


to long of a cord or to small of Gage wise or filters are clogged or compactor on the motor is going bad.

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1 Answer

Gas Engine shuts down after maxium air pressor is reached


hi yor problem seems to be that your machine is running too high a pressure,try adjusting your unloader valve so that your pressure is no more than 120psi , if that fails then check and replace your non return valve
please let me know how you get on best of look

Mar 24, 2009 | Honda Air Tools & Compressors

1 Answer

Electric motor stalls


A compressor can stall before completing a cycle if the motor is not receiving correct power, such as when there is an extension cord being used or outlet is overloaded with other appliances. Other problems that cause this condition are in-tank check valve is leaking pressure back to the pump and weak or failed capacitor. Some volt meters have setting for checking caps. Reject the capacitor if reading is 90% of rated value. Rare problems include worn bearing or bad contacts on pressure switch. enjoy

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