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Leak inside motor casing

I hear air leak inside the plastic housing and compressor runs continuously

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  • edward woodard May 11, 2010

    what is the type and model of your compressor

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Broken line under the cover

Posted on Jan 05, 2009

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Excessive air pressure buildup that's blowing safety valve and can hear air leaking inside unit.this compressor is only about a year old!thankyou.


Excessive air pressure...if your safety valve is truely popping off, is caused by a bad pressure switch or a loose wire connection at the switch. It's a little odd to be leaking too. There is a couple a possibilities here. The most common spots for leakage is the "tube seal", the aluminum transfer/supply tube, or the outlet air hose. Usually a leak will keep a unit from acheiving full pressure causing the unit ot run continuously. The other common leakage spot is the "check valve" and a leak here usually makes the auto restart (upon using air from the tank, taking pressure below the set lower limit), not work,stalling the motor and popping a breaker. See ereplacementparts for a proper breakdown and identification of parts. Spliting the clamshell is a "pain in the neck" for these little units, but you"ll likely have to do that to find your internal leak. Carefully avoiding electrically exposed parts, spray a soapy water solution at suspected joints if the leak is not obvious.

Oct 20, 2012 | Dewalt D55141 Oil-Free Hand Carry...

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My compressor since new, at times will leak air from under the cover while the pump is running and after it cuts off. Sometimes works perfect. Took it apart and could not see a problem. Any suggestion


There is a check valve that is wired into the on off switch. If there are no air leaks when the unit is not running then it is normal. The other possibility is a leak where the rubber hose conncets to a metal tube inside the plastic housing.

Jul 13, 2011 | Porter Cable C2002 150 Psi 6 Gal...

1 Answer

My compressor will not go over 20 psi i have a craftsman 921 4 gal 125 psi compressor and it will not build past 20 psi i do not know how to get to the pistons and stuff what do i do?


The problem with compressors not building pressure is usually a bad pressure switch or bad regulator. Does the motor shut off at 20psi or does it continue running and not build pressure? If the motor continues to run with no increase in pressure, the you should go over the machine looking for air leaks from your regulator back all the way to the motor. Any air leak while the compressor is running can cause the pressure to "peak" way before the intended shutoff that it is regulated to.

Mar 01, 2011 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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I have a C2006 Type 4 Porter Cable pancake compressor which will build pressure all the way up to 150psi then cut off as it should but there will be a loud hissing and pressure drop until the cut on...


first you have a reciprocating pump and the hissing you ear probably comes from the unloading valve on the pressure switch(it will look like a bike tire valve)if there is air coming out the valve when the compressor is off it probably means you have a bad check valve.This valve is use to unload the pressure inside the pump for an easy start .a motor always drive more amps on start up if you cant unload this pressure you will trip the overload(you probably have a reset button on your motor)check the specs on your pressure relief valve ,its a small pump maybe its just adjusted to high.in this case your pressure relief valve will open .If the pressure is fine and there is air coming out the relief valve then you have to replace it!to adjust your pressure turn the screw on your pressure switch clockwise to increase and counterclockwise to decrease .usually you have a 30 psi between cut-in and cut-off called the pressure differential.It can be adjusted on some pressure switch.be sure you put some teflon tape on the treads if you replace something to avoid air leaks.hopes this help!

Jan 23, 2011 | Porter Cable C2002 150 Psi 6 Gal...

1 Answer

I have an H1506FWH Husky 6 gal 1.5 hp compressor that won't build air pressure. While running I noticed a change in the sound but it kept running. However, I no longer had much pressure. Now I can't get...


Locate the piston housing and remove the outer plate 4 screws
then tap on the next plate and when you remove it ( its the reed plate) you will most likely see a hole in one or more of the reeds
I am not technical but I have the same peoblem and I am trying to replace the reed plate on mine when I saw this. Good luck

Nov 22, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

2 Answers

I have had this problem intermittently - often it occurs if I left the compressor pressurized overnight (i.e. forgot to drain it.) In the morning the pressure has gone down - I can turn it back on and...


There is only one relief valve and it is on the outside. The valve is set to open if pressure builds past 160psi. You may be having trouble with the pressure regulator (large knob with high/low arrow). This regulator will leak at times. You can determing if it is leaking by unplugging /shutting off the compressor when you hear the leak. If the leak stops as you shut it off then most likely due to discharge tube seal at the head of the pump. If you continue to hear leak after shut off turn pressure knob counter clockwise all the way out. If you hear a change in the amount of leak or stops then pressure valve is problem. Parts are available at dewalt service center or at www.toolpartsdirect.com

Oct 03, 2010 | Porter Cable C2002 150 Psi 6 Gal...

1 Answer

The motor runs continuously and the pressure is low. What are the possible causes for this?


You haven't given any model number information, but typically on any air compressor if it won't build pressure, either you have a leak in your piping, tank, hose or the compressor cannot move the required cfm of air. Could be a valve problem or piston, relief valve? Do you hear any air leaking. There are som many different models from cheap throw away compressors to thousands of dollar models. HArd to say without more information

Jul 19, 2010 | Dayton Audio Dayton Speedaire Air...

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I have a 5hp 16gal. 135 max psi. The compressor builds up to about 50 psi. But no more. The compressor continuously runs never shutting off. I can hear no leaks. Also the on/off switch runs in the off...


take the power surply cover off and look down the side on the butten at the contacts, id say it isnot the pressur switch itself, and make sure all bolts are tight and check the reeds

Jun 10, 2010 | Campbell Hausfeld 02-Gallon Air...

2 Answers

Can not build working pressure pressure......


The most likely problem is a burned out "run capacitor" on the motor. If you continue to try to run your compressor in this condition it will burn out the "starting capacitor" and/or motor as well.
It's also possible that you have a bad start up pressure relief valve, this valve will be between the compressor and the tank. If this valve is working properly you should hear a hiss of air as the compressor motor shuts off.
A reasonable motor repair shop should be able to replace the run capacitor for $20-$50 plus inflation, depending on your area.
If you need to test the start up pressure relief valve, you need to take it loose at the compressor or tank. Just loosening the line may not work depending on the style used. Note: sometimes just taking this loose to test it causes you to have to replace the valve.

May 29, 2010 | Craftsman 1 Hp, 4 Gal. Air Compressor

1 Answer

Quit working...is there a reset button?


the reset button should be on the elec motor,it should be red.if it was leaking air you most likly have a bad checkvalve .it screws into the tank where the airline goes in also.replacments can be had at tsc.

May 19, 2010 | Campbell Hausfeld 5.0 Hp Cast Iron Air...

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