The air is coming out of the pressure switch but the problem is the tank check valve. The tank check valve is on the tank where the large line from the pump feeds into the tank. There is also a smaller line, either plastic or copper, from the check valve to the pressure switch. When the pump shuts off the check valve is supposed to close and the pressure switch opens a valve that lets the head pressure bleed off through the small line. This lets the motor start the next time without any pressure in the head. If the check valve isn't closing properly the air will leak out as you describe.
SOURCE: Compressor fills with air and shuts off. No
This sounds like a problem with you check valve. This should seal after the air compressor shuts down but if there is a problem with the check valve then it will allow the air to escape back out from the take.
Here is a link to the parts breakdown:
http://shoppingcart.msservicecompany.com/msservice_net/product_files/C2002-WK/C2002-WK%20PD.pdf
You want to check part # 11 A19714.
Thanks
SOURCE: AIR LEAK ON CRAFTSMAN AIR COMPRESSOR, 3HP,25 GAL, HORIZ TANK
The needle valve that you see is the unloader which releases air pressure from the discharge line after set pressure is obtained. If air continues to leak after the compressor shuts off, the check valve installed in the tank is leaking air out of the tank. Follow the air discharge line from the compressor to the tank. There you will find a brass valve which is the check valve. Simple test is to remove the smaller airline (1/4") from the brass valve and check for air leaking. If leaking remove brass valve and check for debris under the white seat. If you cannot clean the valve, replace with generic check valve from www.grainger.com. It will cost less than factory part. Just order the valve considering the fitting sizes that you need. For exact replacement,( www.sears.com parts). If you sears model # begins with WL then your compressor is made by campbell hausfeld and parts may be ordered from www.chpower.com. Good Luck with you repair and email if you have more questions.
SOURCE: Air compressor does not regulate pressure to set point.
Emglo airmate compressors are set from the factory to shut off at around 125psi. There is an adjustment (remove cover to pressure switch) that will controll the cut-off pressure but it is not recommended changing the factory setting. There is also a safety valve installed that will open at about 160psi. It is a small brass device with a pull ring. When things go wrong with the pressure switch (rectangular box with power cord coming out of one side) the safety will pop open. There is a pressure regulator with round knob on panel that will lower the pressure to the tool, however this regulator does not control the pressure switch. Let you compressor run untill it shuts off and verify pressure to be about 125, if it is then all as well. Good Luck
SOURCE: the air tanks fill with air, but the pressure
SInce the pressure gauge is not working, replace it. Also remove the regulator and clean it. Be sure to unplug the compressor and drain the tank before you start.
SOURCE: -compressor comes on and when it shuts off a hole
It sounds like your pressure switch has a bad diaphragm. I'd replace the switch.
--W/D--
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