Question about Makita MAC5200 Electric Powered Air Compressors

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Will only build pressure to 100psi of rated 140psi

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Chances are that the pressure switch, were you turn the compressor on and off, is bad. When they go out, they no longer build pressure to the regulated level you are looking for. If you haven't already, try turning up the regulator, if no more than 100psi build's, then it's a sure thing, bad pressure switch.

Posted on Jan 04, 2011

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Posted on Jan 02, 2017

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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
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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
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that unit will require a 20cfm compressor to run it peoperly

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1 Answer

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My CW210500SJ is rated to shut the compressor off at 125psi but it shuts off at 140psi. Did you resolve your question?

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When the unit is on and building pressure, the safety valve goes off before it reaches the factory set 150psi pressure. I then lose most of the air and it starts over until the safety valve releases again...


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I think you are correct with the motor problem but without the model number it hard to know what set up you have.

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1 Answer

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don't know what model you have. They are all pretty similar tho. Look for the regulator should have a cover on it with a single nut in the center of the cover holding it on.Under the cover is a diaphragm and a spring. tighten the adj. on the spring the compressor will shut off at higher pressure. You don't want to exceed the max rating (ie: if is suppose to shut down at 100psi don't try to go higher.)

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1 Answer

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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.

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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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