Question about Chicago Pneumatic Air Tools & Compressors

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Compressor wont run unless I cover the air intake where the filte

When I turn it on it runs about a second and dies. When I put my handover the hole that sucks in air it runs fine

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Most compressors have an in-tank check valve that prevents pressure in the tank from loading the compressor and forcing the motor into overload. The pressure switch also has an unloader that releases pressure in the system so that the motor will not strain when it recycles. When you restrict the intake, the compressor is unloaded thus the motor will continue to run. There may be a problem with the checkvalve or the motor may have a weak or failed capacitor. Some meters have a capacitor test to check if the capacitor is the problem. Reject the capacitor it it tests out of range more than ten percent. enjoy

Posted on Nov 29, 2008

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Posted on Jan 02, 2017

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Why doesn't my rockworth compressor fill up when it's running it's brand new

This could be an assembly error at the company. There are three valves in a compressor, one is an intake, one is an exhaust, one is an unloader. The easiest way to check is to put your hand on the intake air filter to check for suction. If there is suction then the valve is ok on the intake, if it flutters then it is bad or missing. Locate the on off switch and there should be a valve that unloads the pressure from the compressor, see if that is leaking.

May 05, 2016 | Rockworth Factory-Reconditioned...

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Super silent air 20-air compressor not running it humms for 3 seconds an then turns off every say 10- 15 seconds.

Hi, does it build up preasure? Possible problems can be too much water in the tank, air intake pluged, auto shut-off not properly adjusted or defect. Was it run hot before without oil?

Oct 26, 2013 | Silentaire Technology Super Silent 20-A...

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The motor is running. Belts and pulleys are turing. oil level is good. No leaking from tank or conectionslbs. Motor runs contiuously tank Air pressure will not rise above 25-50.

While the compressor is running and has reached point of not attaining higher pressure remove air filter and place your gloved finger over the intake hole (be carefull may be hot). If compressor is working properly you will feel suction, if however you feel air blowing out of intake most likely blown head gasket /s and or broken reed valves. Easy to fix however, look for parts at

Nov 03, 2010 | Coleman 6.5hp - 80 Gallon Vertical ASME...

1 Answer

Air compressor air intake blows out hot air and wont build up psi

its either a reed valve broke or corroded beyond function.remove the head and look at the plates.look at the piston rings while your in there sounds like its just worn out,but i just rebuilt mine for 80 bucks thats all the gaskets plates and piston with sleeve.the repair takes about an hour.if you do tackle this yourself remember the fan for the air cooling may be reverse thread.try not to break it.noone mentioned this to me but i got lucky and tried the other way before i got serious about removing it.good luck

Mar 20, 2010 | Craftsman Air Tools & Compressors

1 Answer

Will not build up pressure

You did not state whether the compressor would kick on automatically, or whether it would kick off at some point, so I have to work through it with you....
If the compressor runs, you should see pressure on one of the two gauges. The gauge that is closest to the tank is the pressure that the compressor proper is putting out to the tank, and is the primary gauge. The other gauge is the pressure supplied to the tool via the hose, downstream of the regulator. If you are seeing pressure at the first gauge, that's a good sign. Also a good sign is if the commpressor runs and switches off at some point before lifting the PRD (pressure relief device). This tells you that the compressor is pumping and that the pressure switch is working. If this is the case, try working the regulator control knob and watch the second gauge. The regulators can be tricky; sometimes the regulator knob operates in the opposite direction than expected, depending on the type of regulator, so experiment a bit. (Usually there is wording and an arrow on the knob telling you the direction to adjust. If you start to see a rise in the pressure on the gauge, go ahead and set the desired tool supply pressure.
If you can get a pressure on the first gauge, but nothing on the second gauge no matter how you manipulated the regulator, you should suspect a bad regulator.
If there is no pressure on the first gauge, try cracking open the drain valve on the tank and starting the compressor. If you get air out of the tank with no indication on the gauge, you should suspect a bad primary gauge. If you get no air out of the tank, open the drain valve further and check again. If still no air, the compressor itself is suspect. You will need to determine that the motor is in fact turning the compressor. If the motor is running, but the compressor isn't moving, unplug the compressor and reconnect the linkage. If the compressor will run with the motor, the compressor may be shot, or tha air intake may be plugged off. Remove the cover on the air intake and inspect the filter. Clean and replace as required.
If the compressor will start when you operate the on/off switch, but does not kick off at some point, the pressure switch is probably at fault. It is an odd piece of is mechanical, electrical and pneumatic, all at once. You would need to troubleshoot each portion in order to put it right. The most common problem with the pressure switch is burned or welded contacts, followed by wiring issues to the contacts, then the air line to the switch, then mechanical linkages within the switch.
This humble guide should be enough to get you going. I hope that it has been useful.

Regards, and good luck!


Jul 18, 2009 | Campbell Hausfeld 02-Gallon Air...

1 Answer

I have a 3hp 15gal air compressor that i bought used, when i plug it in it seems to run just fine but it don't seem to build air pressure, it stops building around 15lbs but the compressor keeps running...

I am assuming that your compressor is oilfree type. Lets go over some basics to determine where fault is located. You will need to do some simple tests. If there are leaks the compressor may not reach set pressure. I use soapy water on all connections and on the head/headvalve (remove plastic covers to get to all parts that may leak) while compressor is running. Make repairs as necessary. If still low pressure, while compressor is running and has reached max obtainable pressure (in your case 15 lbs), carefully place finger over intake port hole (remove filter). If the compressor is pumping normally but leaking there will be ample suction at intake and cause the compressor to speed-up when intake is obstructed with finger. If you feel plenty of suction and no visible (soapy water) leaks, then the problem is probably the cylinder /ring is not correctly seating /scratched and air is leaking past cylinder. Make sure that the cylinder /piston ring is properly aligned and that the lip on the vinyl ring is up toward the head. On oilfree compressors you can examine the cylinder by pushing the piston all the way up, then look for scratches neer top of cylinder. If scratched install cylinder kit. If you do not feel suction but rather air blowing out of the intake, then the problem is the headvalve plate/reed valves are leaking. The reeds must seal perfectly on their seats and not be bent or have obstruction. Replace as necessary. Only one other thing to check and that is the intank check valve. Easy to check. Run compressor till you have about 15 + lbs in the tank then unplug compressor. Carefully loosen the inlet hose at checkvalve and listen for air leaking out of tank. If leaking replace checkvalve. Use caution when removing head to try and save the gaskets. If you see any model numbers on your compressor beginning with WL, you probably have a unit built by Campbell Hausfeld and can find parts at
Good luck on your repair and email if you have other question.

May 09, 2009 | Craftsman Air Tools & Compressors

1 Answer

Tank will not build pressure beyond 25 lbs. Just runs


Apr 12, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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Air compressor/ alot of air is coming out of the oil cap vent.

this could be blow back possibly bad piston rings you may need new rings oil chamber is usually at intake pressure unit may need rebuild

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