Fixing my compressor

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Blog entry by nailboy1234 posted 07-20-2009 12:27 AM 660 reads 0 times favorited 4 comments Add to Favorites Watch

I have a 17 gallon husky compressor that does not want to shut off once it reaches its max .. instead at the point it should shut off the motor starts whinning??

4 comments so far

View Don K.'s profile

Don K.

1075 posts in 3292 days

#1 posted 07-20-2009 12:49 AM

I have a old Coleman compressor that did the same thing…the pressure adjust valve stripped and it would build to much pressure. It only cost about $5 for a new fitting (Just a plastic screw). But your pop off valve should be kicking in at 120lbs of pressure….you may want to check that also when you fix it.

-- Don S.E. OK

View jerryz's profile


164 posts in 3244 days

#2 posted 07-20-2009 01:19 AM

What do you mean by “max” if your pressure gauge is all the way up past 110psi (the normal pressure where your pressure switch should have tripped) you have a damaged pressure switch.
You should be able to get a new one and replacing it is not that difficult they have 4 connection points, the 110V arrive at 2 points and the motor is connected to the other 2 (obviously there is also a safety ground point). They are also marked on the pressure switch, the motor is connected to the “Load”.
The Pressure Switch is connected to the Air Tank and you need to use teflon tape on the fittings when installing it.

Now if the compressor is whining before reaching the 110psi then you may have a problem with the electric motor that does not have a enough torque to move the compressor when the pressure reaches a high enough value that the motor is not able to overcome.

Hope this helps….

View nailboy1234's profile


2 posts in 3198 days

#3 posted 07-20-2009 01:23 AM

I am pretty sure it is supposed to shut itself off at 120-125 if the pressure switch is not shutting it off …wouldnt it be expected that the motor could not push to much further past that.?

View Don K.'s profile

Don K.

1075 posts in 3292 days

#4 posted 07-20-2009 01:33 AM

depends…some compressors can push until the tank blows. There should be a small copper valve sticking out of the tank somewhere…this is your emergency pressure relief valve.You can buy these for differing pressures at any hardware or automotive store but most are set to go off at about 110 to 130 for about ten dollars. But this does not explain why your compressor is building so much pressure. It could be as I said…the little adjustment screw where you set the pressure is bad…or as Jerry said….the whole valve its self is bad. Or it may just have some trash stuck in the valve keeping it stuck open where it can not shut off.

-- Don S.E. OK

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