craftsman air compressor 4 gal hiss after shuts off

If I try to start it earlier than that, it tries to start, but settles into a whiny sort of noise. It runs fine, but after it shuts off (upon reaching max pressure) it wont start up again unless I wait several minutes (10 - 15). They come with large, 33-gallon tanks and oil-free motors. I have a 2hp 26 gallon Craftsman Air Compressor (919.167280) that recently started acting up. That points to pump valves and you will not have good intake or good outflow from the pump if the pump valve itself is the problem. A Craftsman air compressor cuts out at about 175 PSI, depending on the particular model you chose. Feel if there is lots of air coming out when the pump is cycling – enough to blow your finger off the port? Or, if the compressor is not pumping air into the tank can be checked by pulling the line from where it leaves the pump and runs to the tank. If it’s not drawing in air – you can check the intake carefully with a finger touch to feel if air is being pulled in. The check valve looks like a brass fitting and on the 1/6HP and 1/3HP it is located between the two tees in the compressor trim, on the 1/2HP, 3/4HP and 1HP it connects directly from the head into the discharge tee. You should be able to feel that pump running.Īll this is telling us that likely the problem is in the pump. If no leak is found then the compressor air check valve must be inspected (see Image A). You should be able to tell if the pump is running – hasn’t lost the drive connection to the motor for example – by carefully touching (with glove on) the pump head which will likely be quite hot. What does it mean when an air compressor runs and runs? Aside from it’s broken, of course? First you want to diagnose the scenario.įor example, is the compressor running but not building any air pressure in the tank at all? This is telling you that likely the compressor motor is OK as it’s running, probably the compressor pressure switch is working OK, otherwise the air compressor wouldn’t have come on, when there was little or no air in the tank either. When an air compressor runs and runs and never shuts off, it’s telling you it has a problem!Īs we have noted on a number of pages on this site, the reasons vary from compressor to compressor, but usually boil down to one or two of a few things. Hey! This site is reader-supported and we earn commissions if you purchase products from retailers after clicking on a link from our site.

Craftsman air compressor 4 gal hiss after shuts off