Gradner Denver HRA15-12 problems

1 week 4 days ago - 1 week 4 days ago #2752 by sincerity82

On our shop compressor the bleed line that bleeds pressure after it cuts off bleeds pressure all of the time wide open, while it's running and while it's not running. Recently, we have installed a new motor on it, replaced the popoff valve and tinkered a bit with the cut in and cut out screws, but I am fairly confident we set them back to the way they were. Pressure is set to 125# fwiw..

Thanks in advance

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1 week 4 days ago #2753 by skatingtoolman

After turning your unit off and draining the tank, unscrew this elbow from the hexagonal tank fitting.
Unscrew the tank fitting.
This should be a check valve.
Please take a picture of this and post it here.

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The following user(s) said Thank You: sincerity82

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1 week 4 days ago - 1 week 4 days ago #2754 by sincerity82

thanks for the quick reply..please see below

no idea why the images aren't working here..but here is a link
imgur.com/a/VuXEqf9

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1 week 4 days ago #2755 by skatingtoolman

Please send again as it did not come through or you can email it to This email address is being protected from spambots. You need JavaScript enabled to view it..

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1 week 4 days ago #2757 by sincerity82

couldn't get the images to work but I emailed it....

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1 week 3 days ago - 1 week 3 days ago #2760 by sincerity82

Okay so I have taken the check valve out and cleaned the whole thing from the plastic to the spring. It seems to be functioning properly. What I am curious about, is the hose from the check valve goes to the radiator. This other contraption on the front is where the air leaks out after the compressor cuts off (see circled). Any more ideas as I don't think the check valve I cleaned is the culprit

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