(Plainfield, IN, USA)
Is my Campbell Hausfeld VT558704 check valve bad on our shop air compressor?
When the pump is off, the unloader valve is constantly releasing air.
I’ve tried to remove the check valve from the tank but the bottom of the valve is connected to something inside the tank so I can’t remove the check valve to verify that it is the problem… any suggestions?
I don’t have any idea what the check valve would be attached to inside the compressor tank. As far as I know, it shouldn’t be attached to anything?
If you visit the CH website here:
…you can input the part number and download the manual and parts list.
I did so, and have added the section of the parts image relating to the check valve.
Item #20 is the check valve, and item #21 is the gasket that seals the check valve onto the manifold.
Once you have removed the air line from the check valve, compressor off and tank empty of air first of course, the valve itself should screw right out of the manifold.
I ask anyone that has this type of compressor to comment, if they have successfully removed and replaced the check valve, to help Sam out.