Emglo single Stage Wheeled Portable Electric Motor Air Compressor problem

[steve]

My Emglo single Stage Wheeled Portable Electric Motor Air Compressor is giving me a problem. It runs and starts to build up pressure, then it seems to bog down and just stop compressing. The electric motor tries to keep compressing but I can't get much past 40 lbs. anymore. I replaced the pilot valve but that didn't help much. I had to adjust the pilot valve to the point that it disengages the compressor from the clutch on the motor.

Any ideas?

[J.D.]

I suspect that the one way check valve is not working. This check valve should keep the pressure off of the piston opening only to let air into the tank .

[steve]

Can you tell me where this valve is located?