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My compressor keeps slowly building air after it has reached cut out pressure of 170 , keeps building till it reaches 200 and high pressure valve opens ....

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It is not opening the bypass valve all the way see if there is a adjustment so that it pushes the valve open farther when it slows down.

Posted on Mar 19, 2011

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My craftsman air compressor #919176820 2 HP 12 gallon 200 max psi will not compress over 125 psi


If your compressor is oil-less type, most likely pressure is leaking past piston ring. To verify, remove cover to expose bottom of cylinder (unplug compressor and let out all air). With flashlight, examine the upper-most part of the cylinder (turn motor by hand till piston is at top of stroke). If top of cylinder is scratched, then pressure is leaking past.
For many years now, stores are in a race to have more HP and PSI to attract customers. Customer is really the loser because components used to make the units can not handle the higher pressure. Normally small 115v compressors are set to cut out at 125psi and larger two stage units will cut out at 160psi. Small compressor set to 200psi makes for short lived compressor. Could be compared to driving your car at 100mph all day every day. Longest life is attained when unit is being used at about 60 to 75 % of capacity.
To allow your compressor to reach cutout pressure and keep working for a while, lower cutout to 120psi (pressure switch may be adjustable). To restore to 200psi, replace cylinder/ ring.
If your compressor is oil type, suspect leaking reed valves.

Nov 27, 2011 | Ingersoll Air Tools & Compressors

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Compressor runs but the air bleeds out think it might be stuck reed


If your compressor reaches the cut-out pressure (or very close) , most likely not reed valves. Usually air leaking when compressor is shut off is result of leaking check valve at the tank. Look for brass valve and remove. Somtimes the valve is repairable if debris is keeping valve open. Clean or replace as needed.

Oct 21, 2011 | Porter Cable C2002 150 Psi 6 Gal...

1 Answer

Runs all the time. Why?


The pressure switch should cut off the compressor when cut-out pressure is reached. If however, there is a leak, or the reed valves /gaskets in the head/piston are faulty, the pressure will not build up enough to shut off. With the compressor running, spray soapy water on all fittings including around the head and drain valve. If no leak is found and pressure only builds to less than 50psi suspect reed valves. Parts are low in price and available from various on line stores including www.toolpartsdirect.com Good luck

Oct 15, 2011 | Stanley Bostitch CWC200ST 3HP Oil Lube...

1 Answer

Motor "bogs down" at roughly 120 psi...almost stops


You suspect this unit as being a two stage because of the unusually high cut off pressure. It is a single stage and the motor really has a difficult task and is being pushed to the limits. to reach this pressure. We usually reset the pressure to lower setting ~~ say around 140. Your pump probably has a leaking intank check valve (brass fitting at tank) or leaking valve plate in pump. Simple tests : with pressure in tank unplug compressor from outlet and listens for air leak around pressure switch. As you unplug the running compressor from outlet you should hear air leaking from pressure switch for just a moment as air is let out of airline from pump to tank. If air leaks out till zero pressure then change the valve. If tank holds pressure then valve probably ok. Next test, with no air in tank and air filter removed, plug in compressor and feel intake port for strong suction. If the valve plate is bad, suction will decrease as pressure neers the 120 mark till the point of feeling that air is actually blowing out of intake. With good valve plate there will be strong suction untill unit reaches set pressure. If valve plate is bad also change the cylinder and piston ring. Good luck with your repair.

Jul 28, 2010 | Dewalt 2 Hp 4 GAL Air Compressor

1 Answer

Dewalt 4 gal air compressor will not build pressure in take.


The bleed valve is an unloader of sorts that allows the compressor to start with-out a load. It closes when the pressure in the airline reaches about 20-25lbs with good volume. If air volume is not sufficient, the valve will not close. To solve the problem lets do a few tests. A long cord will reduce power and reduce air volume. Try powering the compressor with-out extension cord. If bleed valve closes when you do not use a cord, the compressor is not getting enough voltage, use shorter cord of the 12 gauge quality and more hose to reach work. If valve still does not close, check for air leaks on all fittings including around pressure switch and drain valve with soapy water. Repair as necessary and retest. If no leaks were found, temporarily plug bleed valve port with screw/bolt and run compressor till set pressure cut-off while counting minuites/seconds. The compressor should fill and shut off within three minutes or so. If it takes an unusually long time to fill, then the reed valves /valve plate is worn and leaking pressure back into cylinger. Leaking valves will usually result in very hot discharge airline/air. Reinstall the bleed valve after test. Parts and partslist are available at www.toolpartsdirect.com . Good luck on the repair and email if you have other questions.

May 06, 2009 | Dewalt 2 Hp 4 GAL Air Compressor

1 Answer

Cut off switch problem


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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Air compressor 3 gallon


When I turn compressor on it does not build up any pressure ?

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Hitachi EC12 Compressor- weird hum


The burst of air you hear as the compressor shuts off is the cylinder unloading so it will not have to restart against a high pressure load. If the unloader is electrical it would explain the hum that you hear. This could be a normal function.

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