I have replaced the pressure switch (cac-4221-1) on my air compressor (919-175951) and the tube on the right leak after its' at correct pressure (120 PSI). Why?

Priscilla V September 27, 2011

Having to work on the Air Compressor and still not able to get it working can be frustrating I have taken the time to research on the Manage My life website and have located a few links that you may find useful. While you are waiting for a detailed reply from an expert I have attached the link below. Hope this is of help!

Mark T EXPERT September 29, 2011

Thank you for your question.

I am sorry you are having a problem with the air compressor. If air continues to leak out of the relief valve on the side of the pressure switch the problem is the check valve in the tank. The check valve is a one-way valve that should allow air to enter the tank but not out. If it is hung open, the air will leak out of the relief valve. The image below shows how to clean the valve. If cleaning the valve does not cure the problem, you need to replace the check valve. The part can be ordered from our parts website: Sears Parts Direct .

If you need further assistance, I will be glad to help. Just reply below with more details.

If you do not feel confident repairing this problem yourself, then you can have it repaired by a Sears technician. Here is a link that will provide the nearest drop-off locations: Sears Home Services .

Thank you for using Manage my life.

Mark T.